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DevTools Extension

Electron supports Chrome DevTools extensions, which can be used to extend the ability of Chrome's developer tools for debugging popular web frameworks.

Loading a DevTools extension with tooling

The easiest way to load a DevTools extension is to use third-party tooling to automate the process for you. electron-devtools-installer is a popular NPM package that does just that.

Manually loading a DevTools extension

If you don't want to use the tooling approach, you can also do all of the necessary operations by hand. To load an extension in Electron, you need to download it via Chrome, locate its filesystem path, and then load it into your Session by calling the [ses.loadExtension] API.

Using the React Developer Tools as an example:

Install the extension in Google Chrome.
Navigate to chrome://extensions, and find its extension ID, which is a hash string like fmkadmapgofadopljbjfkapdkoienihi.
Find out the filesystem location used by Chrome for storing extensions:
- on Windows it is %LOCALAPPDATA%\Google\Chrome\User Data\Default\Extensions;
- on Linux it could be:
  - ~/.config/google-chrome/Default/Extensions/
  - ~/.config/google-chrome-beta/Default/Extensions/
  - ~/.config/google-chrome-canary/Default/Extensions/
  - ~/.config/chromium/Default/Extensions/
- on macOS it is ~/Library/Application Support/Google/Chrome/Default/Extensions.

Pass the location of the extension to the ses.loadExtension API. For React Developer Tools v4.9.0, it looks something like:

 const { app, session } = require('electron')
 const path = require('path')
 const os = require('os')

 // on macOS
 const reactDevToolsPath = path.join(
   os.homedir(),
   '/Library/Application Support/Google/Chrome/Default/Extensions/fmkadmapgofadopljbjfkapdkoienihi/4.9.0_0'
 )

 app.whenReady().then(async () => {
   await session.defaultSession.loadExtension(reactDevToolsPath)
 })

Notes:

loadExtension returns a Promise with an Extension object, which contains metadata about the extension that was loaded. This promise needs to resolve (e.g. with an await expression) before loading a page. Otherwise, the extension won't be guaranteed to load.
loadExtension cannot be called before the ready event of the app module is emitted, nor can it be called on in-memory (non-persistent) sessions.
loadExtension must be called on every boot of your app if you want the extension to be loaded.

Removing a DevTools extension

You can pass the extension's ID to the ses.removeExtension API to remove it from your Session. Loaded extensions are not persisted between app launches.