2025Product
impulse
Browser API client for REST and WebSocket, built for teams.
Test REST and WebSocket APIs in the browser, share collections with your team, switch environments in a keystroke, and still reach the server running on your laptop.
How it works
1
Browser first, proxy fallback
Requests go from the browser first and fall back to a server proxy only on transport failure, so both localhost and CORS-less APIs are reachable.
2
Hardened proxy
The proxy is authenticated, rate limited and size capped, and every target and redirect hop is checked against private ranges after DNS resolution.
3
Team workflow
Shared workspaces with roles, environments with variable substitution, Postman v2.1 import and export, and a collection runner.
Built with
Next.js
TypeScript
PostgreSQL
Prisma
Zustand
Monaco
Socket