SourceMap

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

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The SourceMap HTTP response header links generated code to a source map, enabling the browser to reconstruct the original source and present the reconstructed original in the debugger.

Header type	Response header
Forbidden header name	no

Syntax

http

SourceMap: <url>
X-SourceMap: <url> (deprecated)

Directives

<url>: A relative (to the request URL) or absolute URL pointing to a source map file.

Examples

http

SourceMap: /path/to/file.js.map

Specifications

Specification
Source Map specification # linking-generated-code

Browser compatibility

BCD tables only load in the browser