Double-check your file in production to make sure your comment is there!Īlternatively: Ensure your server returns a valid SourceMap HTTP header Or your CDN might be doing something clever like stripping comments unknowingly Cloudflare’s Autominify feature has stripped these comments in the past. For example, another tool at the end of front-end build toolchain might be stripping comments - which would have the effect of removing //# sourceMappingURL. Note that even if you generate sourceMappingURL properly, it’s possible that it isn’t appearing once you serve your final version in production. Locate the sourceMappingURL comment at the very end of the file on its own line: To verify your source map directive is present and working, you need to: To do that, browser agents expect your bundled JavaScript files to contain either a sourceMappingURL comment or return a SourceMap HTTP header that points to the location of the source map. But generating a source map isn’t worth diddly if the browser can’t find it. We’re going to presume that you’ve already produced a source map using a tool like UglifyJS or Webpack. Reason 1: Missing or incorrect source map directive

If you’re looking to get started with source maps for the first time, check out our earlier post, Debugging Minified JavaScript with Source Maps, before continuing. If you’ve run into some trouble, the tips below will hopefully help you get everything in working order. However, source maps can be tricky to get working properly. In a sense, source maps are the decoder ring to your secret (minified) code. Namely, because they are used to display your original JavaScript while debugging, which is a lot easier to look at than minified production code. This content is out of date Since this blog has been published a lot of improvement have been made to source maps at Sentry.

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