If you run into issues with Indium, this document might help you.

General advice before reporting issues

Issues should be reported on the GitHub issue tracker.

1. If you encounter errors, you can enable debug-on-error in Emacs using M-x toggle-debug-on-error and report an issue with the backtrace.

2. It is also a good idea to turn on Indium’s log mode with M-: (setq indium-client-debug t), and attach to the issue report the contents of the *indium-debug-log* buffer to help resolve the issue.

Attaching the contents of the *indium-process* buffer can help as well in case an error happens in the server process.

The Indium server doesn’t start

First, make sure that indium is installed as documented in the The Indium server section.

If you encounter the error:

"error in process filter: Indium server process error: env: node: No such file or directory"

Chances are that node is not in Emacs’ exec-path. In this case, you can fix it by appending the correct directory to exec-path, or use the exec-path-from-shell package:

(require 'exec-path-from-shell)

Breakpoints are not set (not using sourcemaps)

If breakpoints do not work, chances are that the project is not configured correctly.


Indium needs to know how to map script source urls to files on disk. It uses the root (alias webRoot) configuration option as the base path, as described in the General configuration page.

Indium provides a command indium-list-script-sources to list all scripts parsed by the backend, displaying their sources mapped to files on disk. Check that the file where you’re trying to add a breakpoint is listed.

Breakpoints and debugging do not work (using sourcemaps)

Correctly mapping sourcemaps to file locations can be tedious (see Using sourcemaps).

Indium provides the command indium-list-sourcemap-sources to help configuring sourcemaps correctly. This command displays a list of all sourcemap sources in the runtime as file paths on disk. Check that your files are listed there.