Class: Debugger

An alternate transport for Chrome's remote debugging protocol.

Process: Main

Chrome Developer Tools has a special binding available at JavaScript runtime that allows interacting with pages and instrumenting them.

const {BrowserWindow} = require('electron')
  let win = new BrowserWindow()
  
  try {
    win.webContents.debugger.attach('1.1')
  } catch (err) {
    console.log('Debugger attach failed : ', err)
  }
  
  win.webContents.debugger.on('detach', (event, reason) => {
    console.log('Debugger detached due to : ', reason)
  })
  
  win.webContents.debugger.on('message', (event, method, params) => {
    if (method === 'Network.requestWillBeSent') {
      if (params.request.url === 'https://www.github.com') {
        win.webContents.debugger.detach()
      }
    }
  })
  
  win.webContents.debugger.sendCommand('Network.enable')

Instance Methods

debugger.attach([protocolVersion])

• protocolVersion String (optional) - Requested debugging protocol version.

Attaches the debugger to the webContents.

debugger.isAttached()

Returns Boolean - Whether a debugger is attached to the webContents.

debugger.detach()

Detaches the debugger from the webContents.

debugger.sendCommand(method[, commandParams, callback])

• method String - Method name, should be one of the methods defined by the remote debugging protocol.
• commandParams Object (optional) - JSON object with request parameters.

• callback Function (optional) - Response

  • error Object - Error message indicating the failure of the command.
  • result Any - Response defined by the 'returns' attribute of the command description in the remote debugging protocol.

Send given command to the debugging target.

Instance Events

Event: 'detach'

• event Event
• reason String - Reason for detaching debugger.

Emitted when debugging session is terminated. This happens either when webContents is closed or devtools is invoked for the attached webContents.

Event: 'message'

• event Event
• method String - Method name.
• params Object - Event parameters defined by the 'parameters' attribute in the remote debugging protocol.

Emitted whenever debugging target issues instrumentation event.