whistle

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

15663 stars · 1177 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Whistle is a cross-platform, Node.js-based network debugging and packet-capture proxy supporting HTTP, HTTPS, HTTP/2, WebSocket, and TCP traffic. It offers rule-based request/response modification, a built-in web UI for inspecting traffic, and tools like Weinre, Console, and Composer, with extensibility via plugins.

Use cases

• intercept and inspect HTTPS traffic from browsers or mobile apps
• mock or modify API responses during frontend development
• debug WebSocket and HTTP/2 requests
• remotely inspect mobile web pages with Weinre
• capture and replay HTTP requests
• set up a debugging proxy on a headless Linux server or Docker container
• redirect requests to local files or other hosts via rules

When to choose

• you need a free, cross-platform alternative to Fiddler or Charles
• you want rule-based rewriting of requests/responses without writing code
• you need to debug traffic on headless servers or Docker environments
• you want an extensible proxy with a plugin system and web UI

When to avoid

• you only need simple HTTP logging without interception
• you need low-level packet capture at the network layer (use Wireshark)
• you require a GUI-native desktop app and prefer not to use a web interface

Facets

application · maturity active

http-server proxy developer-tools middleware plugin-system developer-tools web-development networking cross-platform windows cli http-debugging packet-capture traffic-interception websocket-debugging https-proxy weinre fiddler-alternative charles-alternative request-rewriting mocking debugging nodejs macos linux docker

Member repositories

For agents

markdown · JSON · MCP: product_card(name="avwo/whistle")