Crossref Has a Free API — Look Up Any DOI and Get Full Metadata (No Key)

Every research paper has a DOI. But did you know you can resolve ANY DOI to get full metadata through a free API? Crossref manages 150M+ DOIs and provides a completely free, no-key API to query them all. What Is Crossref? Crossref is the DOI registration agency for scholarly content. Their API lets you: Resolve any DOI to full metadata Search across 150M+ works Get citation counts and funding info No API key needed Quick Start import requests doi = " 10.1038/s41586-021-03819-2 " response = requests . get ( f " https://api.crossref.org/works/ { doi } " ) work = response . json ()[ " message " ] print ( f " Title: { work [ ' title ' ][ 0 ] } " ) print ( f " Journal: { work [ ' container-title ' ][ 0 ] } " ) print ( f " Citations: { work [ ' is-referenced-by-count ' ] } " ) print ( f " Authors: { len ( work [ ' author ' ]) } authors " ) Search Papers by Topic response = requests . get ( " https://api.crossref.org/works " , params = { " query " : " CRISPR gene editing " , " rows " : 5 , "