devtools_network

Inspect network activity collected in the session (preserved across reloads). Actions: search (filters below; searchIn picks url/headers/body/postData), get (one request: headers, timing, initiator stack, redirects, security), body (response body, JSON pretty-printed; fetched on demand if not captured), frames (WebSocket frames or SSE messages), har (export HAR artifact), throttle, cache, block/unblock, mock/unmock/rules, replay, clear.

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.

enum

default:"search"

required

One of: search, get, body, frames, har, throttle, cache, block, unblock, mock, unmock, rules, replay, clear.

string

Text or regex

boolean

enum[]

Default url Items: url, headers, body, postData.

string

e.g. “404”, “4xx,5xx”, “500-599”

string

string[]

Resource types: Document, XHR, Fetch, Script, Stylesheet, Image, Font, WebSocket, Other…

number

boolean

string

integer

Body chars to return, default 20000

integer

enum

One of: none, offline, slow3g, fast3g, 4g.

number

boolean

For cache: true disables the cache

string[]

URL globs for block/unblock, e.g. “analytics”

string

URL glob for mock/unmock

object

For replay

integer

Pagination offset, default 0 Range: 0 to ….

integer

Page size, default 50 Range: 1 to 500.

Example

Slow API calls

{
  "tabId": 1234,
  "domain": "api.example.com",
  "minDurationMs": 500
}

Response body

{
  "tabId": 1234,
  "action": "body",
  "requestId": "1234.56"
}

Mock an endpoint

{
  "tabId": 1234,
  "action": "mock",
  "pattern": "*/api/user",
  "response": {
    "status": 200,
    "headers": {
      "content-type": "application/json"
    },
    "body": "{\"name\":\"Test User\"}"
  }
}

Throttle to slow 3G

{
  "tabId": 1234,
  "action": "throttle",
  "preset": "slow3g"
}

Export HAR

{
  "tabId": 1234,
  "action": "har"
}

Browser automation

Developer tools

Parameters

Example

​Parameters

​Example

Parameters

Example