A JavaScript development environment for Emacs https://indium.readthedocs.io
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A JavaScript development environment for Emacs.

Indium connects to a browser tab or nodejs process and provides many features for JavaScript development, including:

  • a REPL (with auto completion) & object inspection;
  • an inspector, with history and navigation;
  • a scratch buffer (M-x indium-scratch);
  • JavaScript evaluation in JS buffers with indium-interaction-mode;
  • a stepping Debugger, similar to edebug, or cider.


Installation instruction and other documentation can be found on readthedocs.

WARNING: Indium 2.0 now uses a client/server architecture, see installation instuctions.


The stepping debugger


The REPL with company-mode


The REPL showing clickable output


The inspector


Missing features

Indium is young, here's a list of missing/wanted features

  • Code evaluation using C-x C-e from project JS buffers
  • Adding breakpoints (to remove the need for debugger statements)
  • Network inspector (could get inspiration from restclient.el)
  • DOM inspector
  • Start processes (chromium, node, grunt, gulp, etc.) from Emacs and attach a indium connection to it.


There is currently support for Chrom[e|ium] & nodejs. The firefox backend is in the TODO list.