PostgreSQL
PostgreSQL, also known as Postgres, is a free and open-source relational database management system emphasizing extensibility and SQL compliance.
What detecting PostgreSQL tells you about a site
Detecting PostgreSQL on a site tells you it ships a databases — a concrete, named part of the stack rather than a guess. PostgreSQL is open source, so the detection signals are stable and well-documented across versions.
About
PostgreSQL, also known as Postgres, is a free and open-source relational database management system emphasizing extensibility and SQL compliance.
Categories: Databases
Quick facts
Detection methodology for Databases
Database technologies that interact with the frontend ship their client SDKs as bundled JavaScript. Prisma's `@prisma/client`, Drizzle's `drizzle-orm`, Supabase's `@supabase/supabase-js`, Firebase's `@firebase/app` — each shows up as a `node_modules/<package>/` path in the sourcemap, with the exact version readable from the embedded `package.json`. The actual database server (Postgres, MySQL, SQLite) is not exposed to the browser by design.
FAQ
How do I check if a website is using PostgreSQL?
Open the page in Chrome, click the Sourcemap Explorer toolbar icon, and read the Stack tab. PostgreSQL's fingerprints span response headers, asset URL prefixes, runtime globals and sourcemap paths, and the popup flags PostgreSQL whenever any combination of them is found. The same checks can be reproduced manually in DevTools — see the "How we detect" section above.
What PostgreSQL version can Sourcemap Explorer detect?
PostgreSQL ships as a hosted databases rather than a bundled npm package, so version-specific detection isn't always possible. Where the platform leaks a version in response headers (`X-Powered-By`, `Server`, generator meta tags) we surface it; otherwise we report presence only.
Is PostgreSQL open source?
Yes, PostgreSQL is open source. The license details are listed on the official site (https://www.postgresql.org/), and the codebase typically lives on a public source-control host.
Where can I read more about PostgreSQL?
Official site: https://www.postgresql.org/. For Sourcemap Explorer's detection guide, see the deep-dive link below or the related guides in the cross-link section.
Keep reading on Sourcemap Explorer
Practical guides
Detected by Sourcemap Explorer
Open the popup on any page running PostgreSQLand you'll see the exact version pulled from the bundled package.json when sourcemaps are exposed.