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from $1.00 / 1,000 normalized metadata records

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Crossref DOI Metadata Normalizer

Try for free

Normalize DOI lists and Crossref bibliographic searches into clean metadata, with duplicate and error reports.

Pricing

from $1.00 / 1,000 normalized metadata records

Rating

0.0

(0)

Developer

monlab

Actor stats

Bookmarked

Total users

Monthly active users

17 days ago

Last modified

Categories

Developer tools

schemaVersion

Optional

Version of this metadata format.

Type:string | null

Example:

1.0

doi

Optional

Normalized DOI, lowercased and without resolver prefix.

Type:string | null

Example:

10.1234/example.001

inputIndexes

Optional

One-based indexes of matching input DOIs; empty in search mode.

Type:integer[] | null

Example:

[
  1,
  3
]

title

Optional

First registered title, with inline markup removed.

Type:string | null

Example:

Example study

containerTitle

Optional

Journal or other publication containing the work.

Type:string | null

Example:

Example Journal

publisher

Optional

Registered publisher.

Type:string | null

Example:

Example Publisher

type

Optional

Crossref work type.

Type:string | null

Example:

journal-article

publishedDate

Optional

Registered publication date without inventing missing month/day.

Type:string | null

Example:

2025-02

publishedDatePrecision

Optional

day, month, year, or unknown.

Type:string | null

Example:

month

publishedDateParts

Optional

Original integer year/month/day parts where available.

Type:integer[] | null

Example:

printPublishedDate

Optional

Print publication date at its original precision.

Type:string | null

Example:

2025-02

onlinePublishedDate

Optional

Online publication date at its original precision.

Type:string | null

Example:

2025-01-25

issn

Optional

Registered ISSNs.

Type:string[] | null

Example:

[
  "1234-5678"
]

citationCount

Optional

Crossref referenced-by count, not a complete citation count.

Type:integer | null

Example:

licenseUrls

Optional

Registered licence URLs; not permission to reuse omitted abstracts.

Type:string[] | null

Example:

[
  "https://creativecommons.org/licenses/by/4.0/"
]

doiUrl

Optional

DOI resolver link.

Type:string | null

Example:

https://doi.org/10.1234/example.001

sourceUrl

Optional

Official metadata endpoint.

Type:string | null

Example:

https://api.crossref.org/works/10.1234%2Fexample.001

retrievedAt

Optional

UTC retrieval timestamp.

Type:string | null

Example:

2025-01-15T12:00:00+00:00

missingFields

Optional

Core fields unavailable in the upstream record.

Type:string[] | null

Example:

[
  "publishedDate"
]

Other properties may be included.

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