Yes. The Free tier is 600 requests a month at 100 requests a minute, across every endpoint in the catalogue, with no credit card. Nothing about it expires.

What happens when I hit the quota?

Requests return 429 with the limit, what you have used, and which window you tripped — nothing is queued, and nothing is charged. The monthly quota resets on the 1st (UTC). There is no rollover: unused requests do not carry into the next month.

Do failed requests use up my quota?

A 5xx does not. If a source breaks on our side, the request is excluded from your monthly count. A 4xx does count — a wrong parameter is still a request we answered. Per-minute throttling counts everything, so a retry loop is still throttled.

Which tier do I need?

Start on Free. Every response carries the remaining quota in its headers, and the dashboard reads the same number enforcement uses, so you will see the ceiling coming rather than discovering it.

How is Zapi different from RapidAPI or Apify?

Zapi focuses on a consistent REST contract — one API key, one response format, one error pattern for every source. No need to learn per-provider quirks like on traditional marketplaces, and no need to set up scraping workflows like on Apify.

What about the legality of accessing public data?

Zapi only accesses data that is publicly available without a login. Responsibility for how it is ultimately used stays with the developer — make sure your use case complies with the original source's ToS and the regulations in your operating region.

Is there an official SDK?

One: zpi-sdk, for TypeScript and JavaScript. It carries a typed error hierarchy, retries only what is safe to retry, submits bulk jobs, and verifies webhook signatures. Everything else is plain REST — cURL or any HTTP client works.

Can I request a source that isn’t in the catalogue yet?

Yes, through the community Discord, on any tier.

DOAJ

Directory of Open Access Journals — article and journal search with full APC, licensing, peer-review and preservation metadata, plus OAI-PMH harvesting.

13 endpoints105 calls13/13 passing

Get API key

Article By Doi

DOAJ article lookup by DOI — the doi: binding over search/articles, no key.

GET/v1/research:doaj/article-by-doi/:doi

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Parameters

Name	Type	In	Description
doi	string	path	DOI of the article, with or without a doi.org prefix. Required.

Example response

{"project":"research:doaj",  "data": {"doi":"10.1371/journal.pone.0146294","year":2015,    "links": [      {"url":"http://europepmc.org/articles/PMC4697834?pdf=render","type":"fulltext","contentType":null      }    ],"month":0,"title":"A Biomechanical Comparison of Expansive Pedicle Screws for Severe Osteoporosis: The Effects of Screw Design and Cement Augmentation.",    "authors": [      {"name":"Ching-Lung Tai","orcid":null,"affiliation":null      },      {"name":"Tsung-Ting Tsai","orcid":null,"affiliation":null      },      {"name":"Po-Liang Lai","orcid":null,"affiliation":null      }    ],"endPage":null,    "journal": {      "issns": [        "1932-6203"      ],"title":"PLoS ONE","number":"12","volume":"10","country":"US",      "language": [        "EN"      ],"publisher":"Public Library of Science (PLoS)"    },"abstract":"Expansive pedicle screws significantly improve fixation strength in osteoporotic spines. However, the previous literature does not adequately address the effects of the number of l…",    "subjects": [      {"code":"R","term":"Medicine","scheme":"LCC"      },      {"code":"Q","term":"Science","scheme":"LCC"      }    ],"articleId":"3571d4eba732417e82e9d7a9303eb0d8","createdAt":"2016-06-10T12:12:53Z","startPage":"e0146294","updatedAt":"2025-08-19T21:09:39Z",    "identifiers": [      {"id":"1932-6203","type":"eissn"      },      {"id":"10.1371/journal.pone.0146294","type":"doi"      }    ]  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Article

DOAJ article record by id — open JSON API, no key, rung 1 (direct) per recon.

GET/v1/research:doaj/article/:articleId

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Parameters

Name	Type	In	Description
articleId	string	path	DOAJ article id, 32 hex characters. Required.

Example response

{"project":"research:doaj",  "data": {"doi":"10.25057/2500672X.2038","year":2026,    "links": [      {"url":"https://revistas.iue.edu.co/index.php/nuevoderecho/article/view/2038","type":"fulltext","contentType":"HTML"      }    ],"month":null,"title":"Responsabilidad Prospectiva Ciudadana en Sociedades Algorítmicamente Mediadas: Ética Cívica, Justicia Epistémica e Innovación Democrática",    "authors": [      {"name":"Rafael Alejandro Betancourt Durango","orcid":"https://orcid.org/0000-0002-6423-4864","affiliation":"Universidad Pontificia Bolivariana"      },      {"name":"Diego Alejandro Correa Correa","orcid":"https://orcid.org/0000-0001-9528-2853","affiliation":"Institución Universitaria de Envigado"      }    ],"endPage":null,    "journal": {"title":"Nuevo Derecho","number":"39","volume":"22","country":"CO",      "language": [        "EN",        "ES"      ],"publisher":"Institución Universitaria de Envigado"    },"abstract":"\nLas democracias contemporáneas afrontan un desafío filosófico de primera magnitud: la colonización algorítmicamente mediada de la deliberación pública, la formación epistémica y l…",    "keywords": [      "responsabilidad prospectiva ciudadana",      "mediación algorítmica"    ],    "subjects": [      {"code":"K","term":"Law","scheme":"LCC"      },      {"code":"K1-7720","term":"Law in general. Comparative and uniform law. Jurisprudence","scheme":"LCC"      }    ],"articleId":"bf9a6965797647f29ec9bc0bb4f1773b","createdAt":"2026-07-30T16:22:40Z","startPage":null,"updatedAt":"2026-07-30T16:22:40Z",    "identifiers": [      {"id":"10.25057/2500672X.2038","type":"doi"      },      {"id":"2011-4540","type":"pissn"      }    ]  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Articles By Journal

Every DOAJ article carrying one journal ISSN — the bibjson.journal.issns: binding over search/articles, no key.

GET/v1/research:doaj/articles-by-journal

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Parameters

Name	Type	In	Description
issn	string	query	Print or electronic ISSN of the journal. Required.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 10, max 100.

Example response

{"project":"research:doaj",  "data": {"issn":"1932-6203","page":1,"count":3,    "items": [      {"doi":"10.1371/journal.pone.0257164","year":2021,        "links": [          {"url":"https://doi.org/10.1371/journal.pone.0257164","type":"fulltext","contentType":null          }        ],"month":0,"title":"The PPLD has advantages over conventional regression methods in application to moderately sized genome-wide association studies.",        "authors": [          {"name":"Veronica J Vieland","orcid":null,"affiliation":null          }        ],"endPage":null,        "journal": {          "issns": [            "1932-6203"          ],"title":"PLoS ONE","number":"9","volume":"16","country":"US",          "language": [            "EN"          ],"publisher":"Public Library of Science (PLoS)"        },"abstract":"In earlier work, we have developed and evaluated an alternative approach to the analysis of GWAS data, based on a statistic called the PPLD. More recently, motivated by a GWAS for …",        "subjects": [          {"code":"R","term":"Medicine","scheme":"LCC"          }        ],"articleId":"00003499008840e299ffa0b2baec2e63","createdAt":"2021-10-20T17:28:34Z","startPage":"e0257164","updatedAt":"2025-08-19T20:27:56Z",        "identifiers": [          {"id":"1932-6203","type":"eissn"          }        ]      }    ],"limit":3,"total":367383,"hasMore":true,"nextPage":2,"provider":"doaj"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Harvest Articles

DOAJ article harvest over OAI-PMH — the documented way past the JSON API's 1000-record ceiling. Pages by resumptionToken, which is a cursor and expires

GET/v1/research:doaj/harvest-articles

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Parameters

Name	Type	In	Description
verb	enum	query	ListRecords returns full metadata, ListIdentifiers only headers. Default ListRecords. One of ListRecords, ListIdentifiers.
metadataPrefix	enum	query	Metadata schema. oai_doaj adds journal, volume and full-text fields. Default oai_dc. One of oai_dc, oai_doaj.
set	string	query	setSpec from harvest-sets, restricting the harvest to one subject.
from	string	query	Lower bound on the record datestamp, YYYY-MM-DD or a UTC timestamp.
until	string	query	Upper bound on the record datestamp, YYYY-MM-DD or a UTC timestamp.
cursor	string	query	nextCursor from a previous call. When set, every other filter is ignored.

Example response

{"project":"research:doaj",  "data": {"verb":"ListRecords","count":300,    "items": [      {"doi":"10.1136/bmjhci-2025-101636","url":"https://doaj.org/article/ff7878e5b5d84fa59c960e2ab33d2f6e","date":"2026-07-01T00:00:00Z",        "sets": [          "TENDOkNvbXB1dGVyIGFwcGxpY2F0aW9ucyB0byBtZWRpY2luZS4gTWVkaWNhbCBpbmZvcm1hdGljcw~~"        ],"type":"article",        "issns": [          "2632-1009"        ],"title":"Novel two-stage deep learning framework for automated pressure injury classification","deleted":false,        "sources": [          "BMJ Health & Care Informatics, Vol 33, Iss 1 (2026)"        ],        "creators": [          "Chien-Wei Chen"        ],"recordId":"ff7878e5b5d84fa59c960e2ab33d2f6e",        "subjects": [          "Computer applications to medicine. Medical informatics"        ],"datestamp":"2026-07-31T00:40:51Z",        "languages": [          "EN"        ],"publisher":"BMJ Publishing Group",        "relations": [          "https://informatics.bmj.com/content/33/1/e101636.full"        ],"identifier":"oai:doaj.org/article:ff7878e5b5d84fa59c960e2ab33d2f6e","description":"Objective The study aims to develop an artificial intelligence (AI) framework for automatic pressure injury (PI) staging directly from raw clinical images, without requiring manual…",        "identifiers": [          "10.1136/bmjhci-2025-101636"        ]      }    ],"cursor":"eyJtIjogIm9haV9kYyJ9","hasMore":true,"provider":"doaj","nextCursor":"eyJtIjogIm9haV9kYyIsICJ1IjogIjIwMjYtMDctMzFUMDA6NDE6MjdaIiwgIm4iOiAzMDAsICJhIjogWyIyMDI2LTA3LTMwVDIzOjAxOjE1WiIsIDFdfQ==","metadataPrefix":"oai_dc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Harvest Journals

DOAJ journal harvest over OAI-PMH. Pages by resumptionToken, which is a cursor and expires after 24h, not a page number you can jump to. The journal feed

GET/v1/research:doaj/harvest-journals

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Parameters

Name	Type	In	Description
verb	enum	query	ListRecords returns full metadata, ListIdentifiers only headers. Default ListRecords. One of ListRecords, ListIdentifiers.
set	string	query	setSpec from harvest-sets, restricting the harvest to one subject.
from	string	query	Lower bound on the record datestamp, YYYY-MM-DD or a UTC timestamp.
until	string	query	Upper bound on the record datestamp, YYYY-MM-DD or a UTC timestamp.
cursor	string	query	nextCursor from a previous call. When set, every other filter is ignored.

Example response

{"project":"research:doaj",  "data": {"verb":"ListRecords","count":300,    "items": [      {"doi":null,"url":"https://doaj.org/toc/2448-7937","date":"2026-07-30T20:00:41Z",        "sets": [          "TENDOkxhdw~~"        ],"type":"journal",        "issns": [          "2448-7937"        ],"title":"Problema: Anuario de Filosofía y Teoría del Derecho",        "rights": [          "CC BY-NC"        ],"deleted":false,"recordId":"8005ee2ac50e482f85c2865de2ad119f",        "subjects": [          "law"        ],"datestamp":"2026-07-30T20:00:41Z",        "languages": [          "EN"        ],"publisher":"Universidad Nacional Autónoma de México",        "relations": [          "https://revistas.juridicas.unam.mx/index.php/filosofia-derecho/tematica-y-alcance"        ],"identifier":"oai:doaj.org/journal:8005ee2ac50e482f85c2865de2ad119f","description":null,        "identifiers": [          "2448-7937"        ]      }    ],"cursor":"eyJtIjogIm9haV9kYyJ9","hasMore":true,"provider":"doaj","nextCursor":"eyJtIjogIm9haV9kYyIsICJ1IjogIjIwMjYtMDctMzFUMDA6NDE6MzFaIiwgIm4iOiAzMDAsICJhIjogWyIyMDI2LTA3LTI0VDIzOjI5OjIzWiIsIDNdfQ==","metadataPrefix":"oai_dc"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Harvest Sets

The OAI-PMH set list — every setSpec accepted by harvest-articles and harvest-journals. One shot: the upstream serves all sets without a cursor.

GET/v1/research:doaj/harvest-sets

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Parameters

No parameters. Call it as is.

Example response

{"project":"research:doaj",  "data": {"count":526,    "items": [      {"name":"LCC:1789-","term":"1789-","scheme":"LCC","setSpec":"TENDOjE3ODkt"      },      {"name":"LCC:Academies and learned societies","term":"Academies and learned societies","scheme":"LCC","setSpec":"TENDOkFjYWRlbWllcyBhbmQgbGVhcm5lZCBzb2NpZXRpZXM~"      },      {"name":"LCC:Accounting. Bookkeeping","term":"Accounting. Bookkeeping","scheme":"LCC","setSpec":"TENDOkFjY291bnRpbmcuIEJvb2trZWVwaW5n"      },      {"name":"LCC:Acoustics in engineering. Acoustical engineering","term":"Acoustics in engineering. Acoustical engineering","scheme":"LCC","setSpec":"TENDOkFjb3VzdGljcyBpbiBlbmdpbmVlcmluZy4gQWNvdXN0aWNhbCBlbmdpbmVlcmluZw~~"      },      {"name":"LCC:Acoustics. Sound","term":"Acoustics. Sound","scheme":"LCC","setSpec":"TENDOkFjb3VzdGljcy4gU291bmQ~"      },      {"name":"LCC:Advertising","term":"Advertising","scheme":"LCC","setSpec":"TENDOkFkdmVydGlzaW5n"      },      {"name":"LCC:Aesthetics","term":"Aesthetics","scheme":"LCC","setSpec":"TENDOkFlc3RoZXRpY3M~"      },      {"name":"LCC:Aesthetics of cities. City planning and beautifying","term":"Aesthetics of cities. City planning and beautifying","scheme":"LCC","setSpec":"TENDOkFlc3RoZXRpY3Mgb2YgY2l0aWVzLiBDaXR5IHBsYW5uaW5nIGFuZCBiZWF1dGlmeWluZw~~"      }    ],"provider":"doaj"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Journal By Issn

DOAJ journal lookup by ISSN — the issn: binding over search/journals, matches print and electronic ISSN alike.

GET/v1/research:doaj/journal-by-issn/:issn

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Parameters

Name	Type	In	Description
issn	string	path	Print or electronic ISSN, eight characters with an optional hyphen. Required.

Example response

{"project":"research:doaj",  "data": {    "apc": {      "max": [        {"price":2477,"currency":"USD"        }      ],"url":"https://plos.org/publish/fees/","hasApc":true    },    "ref": {"journal":"https://journals.plos.org/plosone/","aimsScope":"https://journals.plos.org/plosone/s/journal-information","oaStatement":"https://journals.plos.org/plosone/s/journal-information#loc-open-access","licenseTerms":"https://journals.plos.org/plosone/s/licenses-and-copyright","authorInstructions":"https://journals.plos.org/plosone/s/submission-guidelines"    },"boai":true,"eissn":"1932-6203",    "issns": [      "1932-6203"    ],"pissn":null,"title":"PLoS ONE","inDoaj":null,"ticked":true,    "waiver": {"url":"https://www.plos.org/fee-assistance","hasWaiver":true    },"oaStart":2006,    "keywords": [      "science"    ],    "licenses": [      {"by":true,"nc":false,"nd":false,"sa":false,"url":"https://creativecommons.org/licenses/by/4.0/","type":"CC BY"      }    ],    "subjects": [      {"code":"R","term":"Medicine","scheme":"LCC"      }    ],    "copyright": {"url":"https://journals.plos.org/plosone/s/licenses-and-copyright","authorRetains":true    },"createdAt":"2007-03-30T10:53:19Z",    "editorial": {"boardUrl":"https://journals.plos.org/plosone/static/editorial-board","reviewUrl":"https://journals.plos.org/plosone/s/editorial-and-peer-review-process",      "reviewProcess": [        "Anonymous peer review"      ]    },"journalId":"2fdf1470373343b7bd4f825179c685f5",    "languages": [      "EN"    ],    "pidScheme": {      "schemes": [        "DOI"      ],"hasPidScheme":true    },    "publisher": {"name":"Public Library of Science (PLoS)","country":"US"    },"updatedAt":"2026-02-24T15:59:14Z",    "plagiarism": {"url":"https://journals.plos.org/plosone/s/ethical-publishing-practice#loc-plagiarism","detection":true    },    "institution": {"name":null,"country":null    },    "otherCharges": {"url":null,"hasOtherCharges":false    },    "preservation": {"url":"https://portal.issn.org/resource/ISSN/1932-6203",      "services": [        "CLOCKSS"      ],"hasPreservation":true    },    "depositPolicy": {"url":"https://openpolicyfinder.jisc.ac.uk/id/publication/17599",      "services": [        "Open Policy Finder"      ],"hasPolicy":true    },    "articleLicense": {      "display": [        "Embed"      ],"exampleUrl":"https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0146294"    },"lastFullReview":null,"alternativeTitle":"PLOS ONE","lastManualUpdate":null,"publicationTimeWeeks":29  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Journal

DOAJ journal record by id — open JSON API, no key, rung 1 (direct) per recon.

GET/v1/research:doaj/journal/:journalId

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Parameters

Name	Type	In	Description
journalId	string	path	DOAJ journal id, 32 hex characters. Required.

Example response

{"project":"research:doaj",  "data": {    "apc": {      "max": [        {"price":2477,"currency":"USD"        }      ],"url":"https://plos.org/publish/fees/","hasApc":true    },    "ref": {"journal":"https://journals.plos.org/plosone/","aimsScope":"https://journals.plos.org/plosone/s/journal-information","oaStatement":"https://journals.plos.org/plosone/s/journal-information#loc-open-access","licenseTerms":"https://journals.plos.org/plosone/s/licenses-and-copyright","authorInstructions":"https://journals.plos.org/plosone/s/submission-guidelines"    },"boai":true,"eissn":"1932-6203",    "issns": [      "1932-6203"    ],"pissn":null,"title":"PLoS ONE","inDoaj":true,"ticked":true,    "waiver": {"url":"https://www.plos.org/fee-assistance","hasWaiver":true    },"oaStart":2006,    "keywords": [      "science"    ],    "licenses": [      {"by":true,"nc":false,"nd":false,"sa":false,"url":"https://creativecommons.org/licenses/by/4.0/","type":"CC BY"      }    ],    "subjects": [      {"code":"R","term":"Medicine","scheme":"LCC"      }    ],    "copyright": {"url":"https://journals.plos.org/plosone/s/licenses-and-copyright","authorRetains":true    },"createdAt":"2007-03-30T10:53:19Z",    "editorial": {"boardUrl":"https://journals.plos.org/plosone/static/editorial-board","reviewUrl":"https://journals.plos.org/plosone/s/editorial-and-peer-review-process",      "reviewProcess": [        "Anonymous peer review"      ]    },"journalId":"2fdf1470373343b7bd4f825179c685f5",    "languages": [      "EN"    ],    "pidScheme": {      "schemes": [        "DOI"      ],"hasPidScheme":true    },    "publisher": {"name":"Public Library of Science (PLoS)","country":"US"    },"updatedAt":"2026-02-24T15:59:14Z",    "plagiarism": {"url":"https://journals.plos.org/plosone/s/ethical-publishing-practice#loc-plagiarism","detection":true    },    "institution": {"name":null,"country":null    },    "otherCharges": {"url":null,"hasOtherCharges":false    },    "preservation": {"url":"https://portal.issn.org/resource/ISSN/1932-6203",      "services": [        "CLOCKSS"      ],"hasPreservation":true    },    "depositPolicy": {"url":"https://openpolicyfinder.jisc.ac.uk/id/publication/17599",      "services": [        "Open Policy Finder"      ],"hasPolicy":true    },    "articleLicense": {      "display": [        "Embed"      ],"exampleUrl":"https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0146294"    },"lastFullReview":null,"alternativeTitle":"PLOS ONE","lastManualUpdate":"2026-02-24T15:59:14Z","publicationTimeWeeks":29  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Journals By Country

DOAJ journals by publisher country — the bibjson.publisher.country: binding over search/journals. The upstream stores ISO 3166-1 alpha-2 codes only.

GET/v1/research:doaj/journals-by-country

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Parameters

Name	Type	In	Description
country	string	query	ISO 3166-1 alpha-2 country code of the publisher. Required.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 10, max 100.

Example response

{"project":"research:doaj",  "data": {"page":1,"count":3,    "items": [      {        "apc": {"url":"https://jurnal.unej.ac.id/index.php/CERiMRE/charge","hasApc":false        },        "ref": {"journal":"https://jurnal.unej.ac.id/index.php/CERiMRE","aimsScope":"https://jurnal.unej.ac.id/index.php/CERiMRE/aimsandscopes","oaStatement":"https://jurnal.unej.ac.id/index.php/CERiMRE/openaccess","licenseTerms":"https://jurnal.unej.ac.id/index.php/CERiMRE/openaccess","authorInstructions":"https://jurnal.unej.ac.id/index.php/CERiMRE/information/authors"        },"boai":true,"eissn":"2747-173X",        "issns": [          "2747-173X"        ],"pissn":null,"title":"Computational and Experimental Research in Materials and Renewable Energy","inDoaj":null,"ticked":true,        "waiver": {"url":null,"hasWaiver":false        },"oaStart":2018,        "keywords": [          "renewable energy"        ],        "licenses": [          {"by":true,"nc":false,"nd":false,"sa":true,"url":"https://creativecommons.org/licenses/by-sa/4.0/","type":"CC BY-SA"          }        ],        "subjects": [          {"code":"TJ807-830","term":"Renewable energy sources","scheme":"LCC"          }        ],        "copyright": {"url":"https://jurnal.unej.ac.id/index.php/CERiMRE/copyright","authorRetains":false        },"createdAt":"2022-04-18T05:11:41Z",        "editorial": {"boardUrl":"https://jurnal.unej.ac.id/index.php/CERiMRE/about/editorialTeam","reviewUrl":"https://jurnal.unej.ac.id/index.php/CERiMRE/reviewprocess",          "reviewProcess": [            "Peer review"          ]        },"journalId":"00087d1be705481c92efc11a6dc42b80",        "languages": [          "EN"        ],        "pidScheme": {          "schemes": [            "DOI"          ],"hasPidScheme":true        },        "publisher": {"name":"Physics Department, Faculty of Mathematics and Natural Sciences University of Jember","country":"ID"        },"updatedAt":"2026-01-15T10:34:08Z",        "plagiarism": {"url":"https://jurnal.unej.ac.id/index.php/CERiMRE/sfp","detection":true        },        "institution": {"name":null,"country":null        },        "otherCharges": {"url":null,"hasOtherCharges":false        },        "preservation": {"url":null,"hasPreservation":false        },        "depositPolicy": {"url":null,"hasPolicy":false        },        "articleLicense": {          "display": [            "No"          ],"exampleUrl":null        },"lastFullReview":"2022-04-18","alternativeTitle":"CERiMRE","lastManualUpdate":null,"publicationTimeWeeks":10      }    ],"limit":3,"total":2730,"country":"ID","hasMore":true,"nextPage":2,"provider":"doaj"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Journals By Publisher

DOAJ journals by publisher name — the bibjson.publisher.name: binding over search/journals. The name is phrase-matched, so it must be spelled as DOAJ has it.

GET/v1/research:doaj/journals-by-publisher

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Parameters

Name	Type	In	Description
publisher	string	query	Publisher name as DOAJ records it, matched as a phrase. Required.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 10, max 100.

Example response

{"project":"research:doaj",  "data": {"page":1,"count":3,    "items": [      {        "apc": {          "max": [            {"price":770,"currency":"USD"            }          ],"url":"https://www.sciencedirect.com/science/journal/24682276/publish/open-access-options","hasApc":true        },        "ref": {"journal":"https://www.sciencedirect.com/journal/scientific-african","aimsScope":"https://www.sciencedirect.com/journal/scientific-african/about/aims-and-scope","oaStatement":"https://www.elsevier.com/journals/scientific-african/2468-2276/open-access-journal","licenseTerms":"https://www.sciencedirect.com/science/journal/24682276/publish/open-access-options","authorInstructions":"https://www.sciencedirect.com/journal/scientific-african/publish/guide-for-authors"        },"boai":true,"eissn":"2468-2276",        "issns": [          "2468-2276"        ],"pissn":null,"title":"Scientific African","inDoaj":null,"ticked":true,        "waiver": {"url":"https://www.elsevier.com/authors/open-access/choice#waivers","hasWaiver":true        },"oaStart":2018,        "keywords": [          "africa"        ],        "licenses": [          {"by":true,"nc":false,"nd":false,"sa":false,"url":"https://creativecommons.org/licenses/by/4.0/","type":"CC BY"          }        ],        "subjects": [          {"code":"Q","term":"Science","scheme":"LCC"          }        ],        "copyright": {"url":"https://www.sciencedirect.com/science/journal/24682276/publish/open-access-options","authorRetains":false        },"createdAt":"2018-12-31T14:59:13Z",        "editorial": {"boardUrl":"https://www.sciencedirect.com/journal/scientific-african/about/editorial-board","reviewUrl":"https://www.sciencedirect.com/journal/scientific-african/publish/guide-for-authors",          "reviewProcess": [            "Anonymous peer review"          ]        },"journalId":"00d6163fb43b4d8688f414d9727bd1fd",        "languages": [          "EN"        ],        "pidScheme": {          "schemes": [            "DOI"          ],"hasPidScheme":true        },        "publisher": {"name":"Elsevier","country":"NL"        },"updatedAt":"2026-04-27T14:33:15Z",        "plagiarism": {"url":null,"detection":false        },        "institution": {"name":"Next Einstein Forum (NEF)","country":"RW"        },        "otherCharges": {"url":null,"hasOtherCharges":false        },        "preservation": {"url":"https://www.elsevier.com/about/policies-and-standards/digital-archive",          "services": [            "CLOCKSS"          ],"hasPreservation":true        },        "depositPolicy": {"url":null,"hasPolicy":false        },        "articleLicense": {          "display": [            "Embed"          ],"exampleUrl":"https://www.sciencedirect.com/science/article/pii/S2468227618300176"        },"lastFullReview":"2026-04-27","alternativeTitle":null,"lastManualUpdate":null,"publicationTimeWeeks":21      }    ],"limit":3,"total":853,"hasMore":true,"nextPage":2,"provider":"doaj","publisher":"Elsevier"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Journals By Subject

DOAJ journals by subject term — the bibjson.subject.term: binding over search/journals. Terms are Library of Congress Classification headings.

GET/v1/research:doaj/journals-by-subject

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Parameters

Name	Type	In	Description
subject	string	query	Library of Congress subject term, matched as a phrase. Required.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 10, max 100.

Example response

{"project":"research:doaj",  "data": {"page":1,"count":3,    "items": [      {        "apc": {"url":"http://mlj.goums.ac.ir/page/12/About-the-Journal","hasApc":false        },        "ref": {"journal":"http://mlj.goums.ac.ir/index.php","aimsScope":"http://mlj.goums.ac.ir/page/14/Aims--YW_AND-amp;-Scopes","oaStatement":"http://mlj.goums.ac.ir/page/12/About-the-Journal","licenseTerms":"http://mlj.goums.ac.ir/page/12/About-the-Journal","authorInstructions":"http://mlj.goums.ac.ir/page/19/Instruction-to-Authors"        },"boai":true,"eissn":"2538-4449",        "issns": [          "2538-4449"        ],"pissn":null,"title":"Medical Laboratory Journal","inDoaj":null,"ticked":true,        "waiver": {"url":"http://mlj.goums.ac.ir/page/12/About-the-Journal","hasWaiver":true        },"oaStart":2007,        "keywords": [          "medical laboratory"        ],        "licenses": [          {"by":true,"nc":true,"nd":false,"sa":false,"url":"https://creativecommons.org/licenses/by-nc/4.0/","type":"CC BY-NC"          }        ],        "subjects": [          {"code":"R","term":"Medicine","scheme":"LCC"          }        ],        "copyright": {"url":"http://mlj.goums.ac.ir/page/12/About-the-Journal","authorRetains":true        },"createdAt":"2021-06-25T09:58:25Z",        "editorial": {"boardUrl":"http://mlj.goums.ac.ir/page/13/Editorial-Board","reviewUrl":"http://mlj.goums.ac.ir/page/12/About-the-Journal",          "reviewProcess": [            "Double anonymous peer review"          ]        },"journalId":"00023bea7c1444e9aa224df27beff895",        "languages": [          "EN"        ],        "pidScheme": {          "schemes": [            "DOI"          ],"hasPidScheme":true        },        "publisher": {"name":"Golestan University of Medical Sciences","country":"IR"        },"updatedAt":"2026-01-15T10:33:19Z",        "plagiarism": {"url":"http://mlj.goums.ac.ir/content/48/Plagiarism","detection":true        },        "institution": {"name":null,"country":null        },        "otherCharges": {"url":null,"hasOtherCharges":false        },        "preservation": {"url":null,"hasPreservation":false        },        "depositPolicy": {"url":null,"hasPolicy":false        },        "articleLicense": {          "display": [            "Embed"          ],"exampleUrl":"http://mlj.goums.ac.ir/article-1-1284-en.pdf"        },"lastFullReview":"2022-03-01","alternativeTitle":null,"lastManualUpdate":null,"publicationTimeWeeks":4      }    ],"limit":3,"total":2658,"hasMore":true,"subject":"Medicine","nextPage":2,"provider":"doaj"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Search Articles

DOAJ article search — open JSON API, no key, rung 1 (direct) per recon. Upstream caps (page × pageSize) at 1000 and says so in a 400; harvest-articles is the documented way past it.

GET/v1/research:doaj/search-articles

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Parameters

Name	Type	In	Description
query	string	query	Search terms. Supports field scoping such as doi:, bibjson.title:, bibjson.author.name:, bibjson.journal.country:. Required.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 10, max 100.
sort	enum	query	Sort field. Default relevance. One of relevance, createdAt, updatedAt, title, year.
order	enum	query	Sort direction. Default desc. One of asc, desc.

Example response

{"project":"research:doaj",  "data": {"page":1,"count":3,    "items": [      {"doi":"10.3390/idr12030022","year":2020,        "links": [          {"url":"https://www.mdpi.com/2036-7449/12/3/22","type":"fulltext","contentType":"text/html"          }        ],"month":12,"title":"Spontaneous Pathologic Splenic Rupture in a Patient with <i>Plasmodium falciparum</i> Infection, First Case Reported in Israel",        "authors": [          {"name":"Yves Weinberg","orcid":null,"affiliation":"Internal Medicine B Department, Barzilai University Medical Center, Ashkelon 7830604, Israel"          }        ],"endPage":"126",        "journal": {          "issns": [            "2036-7430"          ],"title":"Infectious Disease Reports","number":"3","volume":"12","country":"CH",          "language": [            "EN"          ],"publisher":"MDPI AG"        },"abstract":"Travelers exposed to malaria may develop severe disease and complications. A less well-known complication is spontaneous pathologic splenic rupture, which is still under-reported a…",        "keywords": [          "malaria"        ],        "subjects": [          {"code":"RZ201-999","term":"Other systems of medicine","scheme":"LCC"          }        ],"articleId":"0000adb953d74750b348800878889098","createdAt":"2020-12-09T00:02:48Z","startPage":"121","updatedAt":"2025-08-19T23:11:04Z",        "identifiers": [          {"id":"10.3390/idr12030022","type":"doi"          }        ]      }    ],"limit":3,"query":"malaria","total":35766,"hasMore":true,"nextPage":2,"provider":"doaj"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Search Journals

DOAJ journal search — open JSON API, no key, rung 1 (direct) per recon. Upstream caps (page × pageSize) at 1000 and says so in a 400; harvest-journals is the documented way past it.

GET/v1/research:doaj/search-journals

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Parameters

Name	Type	In	Description
query	string	query	Search terms. Supports field scoping such as issn:, bibjson.title:, bibjson.publisher.name:, bibjson.publisher.country:, bibjson.subject.term:. Required.
page	number	query	Page number. Default 1.
limit	number	query	Items per page. Default 10, max 100.
sort	enum	query	Sort field. Default relevance. One of relevance, createdAt, updatedAt, title.
order	enum	query	Sort direction. Default desc. One of asc, desc.

Example response

{"project":"research:doaj",  "data": {"page":1,"count":3,    "items": [      {        "apc": {"url":"https://link.springer.com/journal/43046/how-to-publish-with-us#Fees%20and%20funding","hasApc":false        },        "ref": {"journal":"https://jenci.springeropen.com","aimsScope":"https://jenci.springeropen.com/about","oaStatement":"https://jenci.springeropen.com/about","licenseTerms":"https://jenci.springeropen.com/submission-guidelines/copyright","authorInstructions":"https://jenci.springeropen.com/submission-guidelines"        },"boai":true,"eissn":"2589-0409",        "issns": [          "1110-0362"        ],"pissn":"1110-0362","title":"Journal of the Egyptian National Cancer Institute","inDoaj":null,"ticked":true,        "waiver": {"url":null,"hasWaiver":false        },"oaStart":2011,        "keywords": [          "cancer"        ],        "licenses": [          {"by":true,"nc":false,"nd":false,"sa":false,"url":"https://creativecommons.org/licenses/by/4.0/","type":"CC BY"          }        ],        "subjects": [          {"code":"RC254-282","term":"Neoplasms. Tumors. Oncology. Including cancer and carcinogens","scheme":"LCC"          }        ],        "copyright": {"url":"https://jenci.springeropen.com/submission-guidelines/copyright","authorRetains":true        },"createdAt":"2016-05-10T11:36:34Z",        "editorial": {"boardUrl":"https://jenci.springeropen.com/about/editorial-board","reviewUrl":"https://jenci.springeropen.com/about",          "reviewProcess": [            "Double anonymous peer review"          ]        },"journalId":"008e9712ea7d4bd98104d89b5128953a",        "languages": [          "EN"        ],        "pidScheme": {          "schemes": [            "DOI"          ],"hasPidScheme":true        },        "publisher": {"name":"SpringerOpen","country":"GB"        },"updatedAt":"2026-03-17T11:38:31Z",        "plagiarism": {"url":"https://www.springeropen.com/get-published/editorial-policies","detection":true        },        "institution": {"name":"Cairo University, National Cancer Institute","country":null        },        "otherCharges": {"url":null,"hasOtherCharges":false        },        "preservation": {"url":"https://www.springeropen.com/get-published/indexing-archiving-and-access-to-data/journal-archiving",          "services": [            "CLOCKSS"          ],"hasPreservation":true        },        "depositPolicy": {"url":"https://openpolicyfinder.jisc.ac.uk/publication/20814?from=single_hit",          "services": [            "Open Policy Finder"          ],"hasPolicy":true        },        "articleLicense": {          "display": [            "Embed"          ],"exampleUrl":"https://jenci.springeropen.com/articles/10.1186/s43046-019-0004-1#rightslink"        },"lastFullReview":"2026-03-17","alternativeTitle":null,"lastManualUpdate":null,"publicationTimeWeeks":11      }    ],"limit":3,"query":"open access medicine","total":1780,"hasMore":true,"nextPage":2,"provider":"doaj"  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Try it

Live request with your key

const data = await client.run(  "research:doaj",  "article-by-doi",  { doi: "10.1371/journal.pone.0146294" });

DOAJ

Directory of Open Access Journals — article and journal search with full APC, licensing, peer-review and preservation metadata, plus OAI-PMH harvesting.

13 endpoints105 calls13/13 passing

Get API key

DOAJ article lookup by DOI — the doi: binding over search/articles, no key.

GET/v1/…doaj/article-by-doi/:doi

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Try it

Parameters

doi

string · path · required

DOI of the article, with or without a doi.org prefix.

Example response

{"project":"research:doaj",  "data": {"doi":"10.1371/journal.pone.0146294","year":2015,    "links": [      {"url":"http://europepmc.org/articles/PMC4697834?pdf=render","type":"fulltext","contentType":null      }    ],"month":0,"title":"A Biomechanical Comparison of Expansive Pedicle Screws for Severe Osteoporosis: The Effects of Screw Design and Cement Augmentation.",    "authors": [      {"name":"Ching-Lung Tai","orcid":null,"affiliation":null      },      {"name":"Tsung-Ting Tsai","orcid":null,"affiliation":null      },      {"name":"Po-Liang Lai","orcid":null,"affiliation":null      }    ],"endPage":null,    "journal": {      "issns": [        "1932-6203"      ],"title":"PLoS ONE","number":"12","volume":"10","country":"US",      "language": [        "EN"      ],"publisher":"Public Library of Science (PLoS)"    },"abstract":"Expansive pedicle screws significantly improve fixation strength in osteoporotic spines. However, the previous literature does not adequately address the effects of the number of l…",    "subjects": [      {"code":"R","term":"Medicine","scheme":"LCC"      },      {"code":"Q","term":"Science","scheme":"LCC"      }    ],"articleId":"3571d4eba732417e82e9d7a9303eb0d8","createdAt":"2016-06-10T12:12:53Z","startPage":"e0146294","updatedAt":"2025-08-19T21:09:39Z",    "identifiers": [      {"id":"1932-6203","type":"eissn"      },      {"id":"10.1371/journal.pone.0146294","type":"doi"      }    ]  },"timestamp":"2026-08-30T00:49:26Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Code

const data = await client.run(  "research:doaj",  "article-by-doi",  { doi: "10.1371/journal.pone.0146294" });