Guides
How to capture, read and export the API traffic of a web app in Chrome. Every guide works with plain DevTools first, then shows the shortcut in Netraptor.
An MCP server for your web app's API traffic (Codex, Claude Code, Cursor)
Give Codex, Claude Code or Cursor your web app's real API traffic through a local, read-only MCP server. Pair once, add one config line, and ask.
7 min read
Chrome DevTools MCP server: setup in Claude Code, attach mode and Playwright MCP compared
Set up Google's Chrome DevTools MCP server in Claude Code or Cursor, attach it to your signed-in Chrome, and compare it with Playwright MCP for API work.
8 min read
What is WebMCP? How Chrome lets a web page register tools for AI agents
WebMCP is a draft browser API that lets a web page register tools for AI agents. See how document.modelContext.registerTool works and Chrome's status in 2026.
7 min read
How to find the API endpoints of a website using browser developer tools
Find the API endpoints of a website with Chrome's developer tools: the Fetch/XHR filter, property filters and search. Then turn the calls into an endpoint list.
7 min read
How to create a HAR file in Chrome, and remove tokens before you share it
Create a HAR file in Chrome: open the Network panel, turn on Preserve log, reproduce the issue and export. Then strip cookies, tokens and keys before you share.
8 min read
What is a HAR file? Meaning, contents and how to get one
HAR file meaning: an HTTP Archive is a JSON log of every request your browser made on a page. See what is inside one, what it is used for and when to share it.
5 min read
How to open a HAR file: free HAR viewers and HAR analyzers
Open a HAR file in Chrome DevTools, the free HAR viewer already in your browser, or in Google's HAR Analyzer online. Then find the failed and slow requests.
7 min read
Preserve log in Chrome: keep network requests after a page reload
Chrome's Network tab clears on every reload. Turn on Preserve log to keep requests across page loads, learn its limits, and find Persist Logs in Firefox.
6 min read
Allow pasting in the Chrome console: what the DevTools warning means and how to clear it
Chrome blocks pasting into the DevTools Console until you type allow pasting. Learn why the self-XSS warning appears, how to clear it and when it comes back.
6 min read
How to create a Postman collection from your browser's requests
Turn the API calls a web app makes in Chrome into a Postman collection with Copy as cURL, then import, clean up and export the collection to share or run it.
6 min read
What is an OpenAPI spec, and how to generate one from your web app's traffic
An OpenAPI spec is a JSON or YAML file describing an HTTP API. Learn to generate one from Chrome traffic with a HAR file, mitmproxy2swagger, or Netraptor.
6 min read
JWT decode: how to decode a JWT token in Chrome without an online decoder
How to decode a JWT token locally: base64url-decode the header and payload in the Chrome DevTools Console and keep live tokens out of online decoders.
7 min read