chrome-cdp

name chrome-cdp description Interact with local Chrome browser session (only on explicit user approval after being asked to inspect, debug, or interact with a page open in Chrome) Chrome CDP Lightweight Chrome DevTools Protocol CLI. Connects directly via WebSocket — no Puppeteer, works with 100+ tabs, instant connection. Prerequisites Chrome (or Chromium, Brave, Edge, Vivaldi) with remote debugging enabled: open chrome://inspect/#remote-debugging and toggle the switch Node.js 22+ (uses built-in WebSocket) If your browser's DevToolsActivePort is in a non-standard location, set CDP_PORT_FILE to its full path Commands All commands use scripts/cdp.mjs . The <target> is a unique targetId prefix from list ; copy the full prefix shown in the list output (for example 6BE827FA ). The CLI rejects ambiguous prefixes. List open pages scripts/cdp.mjs list Take a screenshot scripts/cdp.mjs shot <target> [file] # default: screenshot-<target>.png in runtime dir Captures the viewport only . Scroll first with eval if you need content below the fold. Output includes the page's DPR and coordinate conversion hint (see Coordinates below). Accessibility tree snapshot scripts/cdp.mjs snap <target> Evaluate JavaScript scripts/cdp.mjs eval <target> < expr > Watch out: avoid index-based selection ( querySelectorAll(...)[i] ) across multiple eval calls when the DOM can change between them (e.g. after clicking Ignore, card indices shift). Collect all data in one eval or use stable selectors. Other commands scripts/cdp.mjs html <target> [selector] # full page or element HTML scripts/cdp.mjs nav <target> <url> # navigate and wait for load scripts/cdp.mjs net <target> # resource timing entries scripts/cdp.mjs click <target> <selector> # click element by CSS selector scripts/cdp.mjs clickxy <target> <x> <y> # click at CSS pixel coords scripts/cdp.mjs type <target> <text> # Input.insertText at current focus; works in cross-origin iframes unlike eval scripts/cdp.mjs loadall <target> <selector> [ms] # click "load more" until gone (default 1500ms between clicks) scripts/cdp.mjs evalraw <target> <method> [json] # raw CDP command passthrough scripts/cdp.mjs open [url] # open new tab (each triggers Allow prompt) scripts/cdp.mjs stop [target] # stop daemon(s) Coordinates shot saves an image at native resolution: image pixels = CSS pixels × DPR. CDP Input events ( clickxy etc.) take CSS pixels . CSS px = screenshot image px / DPR shot prints the DPR for the current page. Typical Retina (DPR=2): divide screenshot coords by 2. Tips Prefer snap --compact over html for page structure. Use type (not eval) to enter text in cross-origin iframes — click / clickxy to focus first, then type . Chrome shows an "Allow debugging" modal once per tab on first access. A background daemon keeps the session alive so subsequent commands need no further approval. Daemons auto-exit after 20 minutes of inactivity.