`Debugger.evaluateOnCallFrame`

Evaluates expression on a given call frame.

Domain: Debugger stable

Parameters

Name	Type	Description
`callFrameId`	`CallFrameId`	Call frame identifier to evaluate on.
`expression`	`string`	Expression to evaluate.
`objectGroup` (optional)	`string`	String object group name to put result into (allows rapid releasing resulting object handles using `releaseObjectGroup`).
`includeCommandLineAPI` (optional)	`boolean`	Specifies whether command line API should be available to the evaluated expression, defaults to false.
`silent` (optional)	`boolean`	In silent mode exceptions thrown during evaluation are not reported and do not pause execution. Overrides `setPauseOnException` state.
`returnByValue` (optional)	`boolean`	Whether the result is expected to be a JSON object that should be sent by value.
`generatePreview` (optional)	`boolean`	Whether preview should be generated for the result.
`throwOnSideEffect` (optional)	`boolean`	Whether to throw an exception if side effect cannot be ruled out during evaluation.
`timeout` (optional)	`Runtime.TimeDelta`	Terminate execution after timing out (number of milliseconds).

Returns

Name	Type	Description
`result`	`Runtime.RemoteObject`	Object wrapper for the evaluation result.
`exceptionDetails`	`Runtime.ExceptionDetails`	Exception details.

Example Request

{
  "id": 1,
  "method": "Debugger.evaluateOnCallFrame",
  "params": {
    "callFrameId": "0",
    "expression": "document.title"
  }
}

Example Response

{
  "id": 1,
  "result": {
    "result": {
      "type": "string",
      "value": "Example Domain"
    },
    "exceptionDetails": "exceptionDetails-value"
  }
}

Usage in Node.js

const result = await send('Debugger.evaluateOnCallFrame', {"callFrameId": "0", "expression": "document.title"});
console.log(result);
// {"result": {"type": "string", "value": "Example Domain"}, "exceptionDetails": "exceptionDetails-value"}