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Lightpanda

Lightpanda CDP WebSocket Interface

Lightpanda's primary programmable interface. The browser runs as a CDP server (`lightpanda serve`) and exposes the Chrome DevTools Protocol over a WebSocket endpoint (default `ws://127.0.0.1:9222`). CDP is a bidirectional JSON-RPC wire protocol over WebSocket - not a REST API. Existing Puppeteer, Playwright, and chromedp scripts connect by pointing `browserWSEndpoint` / `connectOverCDP` at this endpoint instead of Chrome.

Documentation Provider Profile APIs.io AsyncAPI GitHub

Lightpanda CDP WebSocket Interface is one of 3 APIs that Lightpanda publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include CDP, WebSocket, Browser Automation, Puppeteer, and Playwright. The published artifact set on APIs.io includes API documentation, an AsyncAPI specification, and an OpenAPI specification.

This event API exposes 2 operations across 1 channel, and defines 6 schemas. It is described by AsyncAPI 2.6.0, at version 1.0.0.

The API connects through 2 servers: 127.0.0.1:9222 (ws), cloud.lightpanda.io/ws (wss).

2 operations 1 channels 6 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 2.6.0
API Version
1.0.0
Base URL
ws://127.0.0.1:9222
Contact
API Evangelist
License
Lightpanda Browser - AGPL-3.0
Resource Areas
1

Channels & Operations 2

Across 1 channel, the API surfaces 2 operations. Each is listed below with its action, channel, parameters, and response codes.

Channels 2
SUB
/cdp
Receive CDP command results and asynchronous events.
receiveCdpMessages body
PUB
/cdp
Send a CDP command to the browser.
sendCdpCommand body

Messages & Schemas 6

The contract defines 6 schemas that model the data carried by its messages. The most detailed are CdpResult (4 properties), CdpCommand (4 properties), CdpEvent (3 properties). Each schema is shown below with its type and property counts.

CdpCommand
message
A Chrome DevTools Protocol command sent from client to browser.
CdpResult
message
A response to a previously sent CDP command, keyed by its id.
CdpEvent
message
An asynchronous event emitted by the browser (no id).
CdpCommand
object
A CDP command message (JSON-RPC style).
4 properties 2 required
CdpResult
object
A CDP command result keyed by the originating command id.
4 properties 1 required
CdpEvent
object
An asynchronous CDP event emitted by the browser.
3 properties 1 required

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

lightpanda-asyncapi.yml Raw ↑

Other APIs Lightpanda publishes across the network.

Lightpanda Cloud
AE Profile APIs.io
Lightpanda CLI / Binary
AE Profile APIs.io
#CDP#WebSocket#Browser Automation#Puppeteer#Playwright
← Back to L APIs
API Details
ID
lightpanda:lightpanda-cdp-websocket-interface
Base URL
ws://127.0.0.1:9222
Docs
https://lightpanda.io/docs
Provider
Lightpanda
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