Hakka

Local-first · no proxy · no cloud

Inspect every request,

right inside your app.

One engine for React Native, web, Next.js, Android, and iOS. In-process capture — no certificate, no account.

Get started

Why Hakka

$ npx hakka init

live · interactive

Works in React Native · Web · Next.js · Android · iOS

standalone · live

Don’t want the whole overlay? hakka-browser/elements ships the same pieces as framework-agnostic custom elements — drop in just a request list, or just stats, anywhere in your own UI.

Build your own devtools with them →

Local-first, always

Hakka runs entirely on your machine. No account, no cloud, no data leaves your device — safe to point at real traffic while you build.

Pick your platform

React NativeCapture fetch, XHR, WebSocket, and native OkHttp/URLSession. Zero proxy.

ExpoUse a development build. Expo Go is not supported.

WebA Shadow-DOM overlay for any browser app.

Next.jsServer + client traffic in one inspector. Two one-line files.

AndroidMaven artifacts with a debug/release no-op split.

iOSSwift Package products with a no-op release variant.

What works where

Capability	React Native	Web	Next.js	iOS	Android
Status	Beta	Stable	Stable	Alpha	Alpha
HTTP capture (fetch/XHR/native)	●	●	●	●	●
WebSocket	●	●	—	◐	◐
Timing waterfall	●	●	●	●	●
Mocking & throttling	●	●	●	●	●
Breakpoints (pause & edit)	●	●	●	●	●
Release-safe no-op build	●	●	●	●	●

● full · ◐ metadata only (message count + close code, opt-in) · — not yet. WebSocket frame payloads need the JS layer.

Alpha: works from source in this repo; published packages (Maven Central, the SPM tag) aren’t out yet. Beta: works and ships on npm, with less production soak time than the Stable platforms.

Do more

Breakpoints

Pause a request or response in-flight, edit it, and resume — the Charles/Proxyman trick, in-process. Read more

Mocking & throttling

Canned responses, block, Map Remote redirect, rewrite, and slow-network profiles. Read more

Ship it safely

Zero overhead in production builds. Production safety

Ask your AI agent

Query live captured traffic from Claude Code via the MCP server.

New here?

Install HakkaPick your platform and capture your first request.

How it worksThe 3-minute architecture tour.