Fetch Metadata for a Study Identifier (DOI or PMID) — df_fetch

Retrieves bibliographic metadata (title, abstract, authors, year, journal) for a given DOI or PMID using online services (Crossref, PubMed).

Usage

df_fetch_metadata(identifier, email = NULL, ncbi_api_key = NULL)

Arguments

identifier: Character string. The DOI or PMID of the study.
email: Character string (optional). Your email address, recommended for NCBI Entrez politeness when fetching from PubMed. If not provided, rentrez might issue a warning.
ncbi_api_key: Character string (optional). Your NCBI API key for potentially higher rate limits. Set using rentrez::set_entrez_key().

Value

A list containing the fetched metadata (identifier, type, title, abstract, authors, year, journal) or NULL if fetching fails or the identifier type is not recognized. Issues warnings on failure.

Examples

if (FALSE) { # \dontrun{
# Fetch metadata for a known PMID (requires internet connection)
pmid_meta <- df_fetch_metadata("25376210", email = "your.email@example.com")
print(pmid_meta)

# Fetch metadata for a known DOI (requires internet connection and rcrossref)
doi_meta <- df_fetch_metadata("10.1038/nature14539", email = "your.email@example.com")
print(doi_meta)

# Example of a potentially invalid identifier
invalid_meta <- df_fetch_metadata("invalid-id")
print(invalid_meta)
} # }