Whistle

aid: whistle
name: Whistle
description: Whistle is a cross-platform HTTP, HTTPS, HTTP/2, WebSocket, and TCP debugging proxy built on Node.js. It enables
  developers to inspect, intercept, modify, and replay network traffic through a rule-based configuration system with a built-in
  web UI.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Debugging Proxy
- Proxy
- Network Debugging
- HTTP
- HTTPS
- WebSocket
- Developer Tools
url: https://raw.githubusercontent.com/api-evangelist/whistle/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-05-03'
specificationVersion: '0.19'
apis:
- aid: whistle:whistle
  name: Whistle
  description: Whistle is a cross-platform HTTP, HTTPS, HTTP/2, WebSocket, and TCP debugging proxy tool. It lets developers
    intercept, inspect, and modify network traffic using a rule-based configuration system. Features include request/response
    modification, local file mapping, API mocking, remote debugging with Weinre, request replay via a built-in Composer, plugin
    support, and a web-based UI.
  humanURL: https://wproxy.org/whistle/
  baseURL: http://localhost:8899
  tags:
  - Debugging Proxy
  - Proxy
  - Network Debugging
  - HTTP
  - HTTPS
  - WebSocket
  - Developer Tools
  - API Mocking
  - Request Replay
  properties:
  - type: Documentation
    url: https://wproxy.org/en/docs/
  - type: GettingStarted
    url: https://wproxy.org/en/docs/getting-started.html
  - type: GitHub
    url: https://github.com/avwo/whistle
  - type: NPM
    url: https://www.npmjs.com/package/whistle
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/whistle/main/json-schema/whistle-rule-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/whistle/main/json-schema/whistle-plugin-schema.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/whistle/main/json-structure/whistle-rule-structure.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/whistle/main/json-ld/whistle-context.jsonld
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/whistle/main/examples/whistle-rule-example.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/whistle/main/vocabulary/whistle-vocabulary.yml
  contact:
  - FN: Whistle Team
    url: https://github.com/avwo/whistle
  features:
  - Request and response interception and modification
  - HTTP, HTTPS, HTTP/2, WebSocket, TCP support
  - Rule-based traffic modification
  - Local file mapping and API mocking
  - Built-in Weinre for remote DOM inspection
  - Request Composer for replay and editing
  - Plugin extensibility system
  - Multiple proxy modes: HTTP, HTTPS, Socks, reverse proxy
  - Cross-platform: macOS, Windows, Linux
  - Web-based management UI at localhost:8899
  use-cases:
  - Frontend development API proxying
  - Mobile app network debugging
  - CORS configuration testing
  - Request/response modification during development
  - API mocking with local JSON files
  - Remote debugging of web pages on devices
  - Traffic inspection and analysis
  integrations:
  - Chrome Extension ZeroOmega for proxy switching
  - Weinre for remote DOM inspection
  - Node.js NPM module integration
  - Desktop client via whistle-client
common:
- type: LinkedIn
  url: https://www.linkedin.com/company/whistle-labs
- type: Website
  url: https://wproxy.org/whistle/
- type: Documentation
  url: https://wproxy.org/en/docs/
- type: GettingStarted
  url: https://wproxy.org/en/docs/getting-started.html
- type: GitHubOrganization
  url: https://github.com/avwo
- type: GitHub
  url: https://github.com/avwo/whistle
- type: NPM
  url: https://www.npmjs.com/package/whistle
- type: DesktopClient
  url: https://github.com/avwo/whistle-client
- type: ChromeExtension
  url: https://github.com/avwo/whistle-for-chrome
- type: PluginScaffolding
  url: https://github.com/avwo/lack
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com