Source map validator
Upload a .map file. See coverage stats, missing fields, and the common mistakes that break deminification before you ship.
Validate any source map (.map file) produced by Webpack, Vite, esbuild, Rollup, or Parcel. This checker parses the JSON, confirms version 3 compliance, and flags the missing fields and path mistakes that quietly break deminification — so you catch them before a real production stack trace lands in your error tracker.
Runs entirely in your browser. Files never leave this page.
Upload a .map file, fetch one by URL, or paste raw JSON to see the validation report.
GlitchReplay does this on every event you capture. Sentry-SDK compatible, flat-rate pricing, session replay included — built on Cloudflare so a bad deploy will never blow up your bill.