devtools_evaluate

Evaluate JavaScript in the page (or a specific frame/context, or the paused call frame) and return the value or the exception. Objects come back as previews with an objectId for devtools_console inspect. awaitPromise defaults to true.

The tool names stay the same across browsers. See browser selection and Firefox and Zen exceptions before choosing an operation.

Parameters

integer

Target tab id from browser_tabs, which lists tabs across all windows. Defaults to the agent’s most recently opened usable tab, or the only usable tab. Otherwise select a listed tabId.

string

required

integer

Execution context id from devtools_sources frames

string

Frame id; picks its default context

string

Evaluate in a paused call frame (devtools_debugger stack)

boolean

Default true; false keeps a live object handle

integer

Range: 0 to 4.

Example

{
  "tabId": 1234,
  "expression": "document.title"
}

In the paused call frame

{
  "tabId": 1234,
  "expression": "user.id",
  "callFrameId": "{\"ordinal\":0,\"injectedScriptId\":2}"
}

Browser automation

Developer tools

Parameters

Example

​Parameters

​Example

Parameters

Example