DOI Content Negotiation

Overview

Any DOI can return structured metadata in multiple formats through HTTP content negotiation — simply set the Accept header when requesting https://doi.org/{doi}. This is the most universal way to get citation metadata, BibTeX entries, JSON-LD, and RDF from any publisher without needing a specific API. Works for all 300M+ registered DOIs. Free, no authentication.

Usage

Basic Content Negotiation

# Get JSON citation metadata (Citeproc JSON)
curl -LH "Accept: application/vnd.citationstyles.csl+json" \
  "https://doi.org/10.1038/nature14539"

# Get BibTeX
curl -LH "Accept: application/x-bibtex" \
  "https://doi.org/10.1038/nature14539"