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electron/docs/tutorial/debugging-main-process.md
Niven Su b9c9da3f4e Update debugging-main-process.md 
fix doc typo
2016-01-19 13:49:49 +08:00

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Debugging the Main Process

The browser window DevTools can only debug the renderer process scripts (i.e. the web pages). In order to provide a way to debug the scripts from the main process, Electron has provided the --debug and --debug-brk switches.

Command Line Switches

Use the following command line switches to debug Electron's main process:

--debug=[port]

When this switch is used Electron will listen for V8 debugger protocol messages on port. The default port is 5858.

--debug-brk=[port]

Like --debug but pauses the script on the first line.

Use node-inspector for Debugging

Note: Electron doesn't currently work very well with node-inspector, and the main process will crash if you inspect the process object under node-inspector's console.

1. Make sure you have node-gyp required tools installed

2. Install node-inspector

$ npm install node-inspector

3. Install a patched version of node-pre-gyp

$ npm install git+https://git@github.com/enlight/node-pre-gyp.git#detect-electron-runtime-in-find

4. Recompile the node-inspector v8 modules for electron (change the target to your electron version number)

$ node_modules/.bin/node-pre-gyp --target=0.36.2 --runtime=electron --fallback-to-build --directory node_modules/v8-debug/ --dist-url=https://atom.io/download/atom-shell reinstall
$ node_modules/.bin/node-pre-gyp --target=0.36.2 --runtime=electron --fallback-to-build --directory node_modules/v8-profiler/ --dist-url=https://atom.io/download/atom-shell reinstall

See also How to install native modules.

5. Enable debug mode for Electron

You can either start Electron with a debug flag like:

$ electron --debug=5858 your/app

or, to pause your script on the first line:

$ electron --debug-brk=5858 your/app

6. Start the node-inspector server using electron

$ ELECTRON_RUN_AS_NODE=true path/to/electron.exe node_modules/node-inspector/bin/inspector.js

7. Load the debugger UI

Open http://127.0.0.1:8080/debug?ws=127.0.0.1:8080&port=5858 in the Chrome browser. You may have to click pause if starting with debug-brk to see the entry line.