How to use source maps in node js?

You can use https://www.npmjs.com/package/source-map-support

$ npm install source-map-support --save-dev

Then change your run command in package.json to:

node -r source-map-support/register index.js

(Note that you should have an index.map.js next to index.js)

In Node v12.12.0+ sourcemaps are supported natively. Pass --enable-source-maps flag to enable them.

One caveat in Node v12.12.0 is that Error.prepareStackTrace will no longer be called when source maps are enabled. This was fixed in v12.16+.