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Requestly

Local-first API client, interceptor, and mocking platform.

Requestly combines a Postman‑style API client, Charles‑like HTTP interceptor, and powerful mocking tools into a local‑first Chrome extension and desktop app, supporting environments, imports, and team collaboration.

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Overview

Highlights

Local workspaces store all data on disk for privacy.
HTTP Rules let you intercept, modify, and redirect live traffic.
Built‑in API mocking supports static, dynamic JS, GraphQL, and bulk recordings.
One‑click imports from Postman, Charles Proxy, ModHeader and more.

Pros

  • Privacy‑first design keeps data local.
  • Unified UI for client, interceptor, and mocking.
  • Cross‑platform: browser extensions and Electron desktop app.
  • Team workspaces enable Git or cloud sync.

Considerations

  • No active open‑source contribution workflow currently.
  • Insomnia import listed as coming soon.
  • Desktop app based on Electron may consume more resources.
  • Advanced scripting requires JavaScript knowledge.

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Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.

Fit guide

Great for

  • Frontend developers who need fast API prototyping without backend.
  • QA engineers building e2e tests with Cypress or Playwright.
  • Small teams seeking a single tool for request testing and traffic manipulation.
  • Developers who prefer data stored locally for compliance.

Not ideal when

  • Enterprises requiring formal open‑source governance and contribution pipelines.
  • Users needing out‑of‑the‑box support for Insomnia imports.
  • Teams that rely exclusively on cloud‑only API management platforms.
  • Developers who need a lightweight CLI without a GUI.

How teams use it

Rapid Frontend Development

Mock backend endpoints locally, allowing UI work to continue while APIs are under construction.

Live Traffic Debugging

Intercept and modify HTTP requests from a web app to test feature flags or environment switches in real time.

Automated End‑to‑End Testing

Integrate Requestly’s mock server with Cypress to simulate API responses in CI pipelines.

Collaborative API Documentation

Share local workspaces via Git or Google Drive, enabling teammates to edit collections and environments together.

Tech snapshot

TypeScript66%
JavaScript22%
SCSS8%
CSS3%
HTML1%
Shell1%

Tags

open-sourceapi-clientpostmanmock-serverhacktoberfestpostman-environmentbrunochrome-extensionapi-testingpostman-collectioncharles-proxyinsomniabruno-alternativeapi-mockfirefox-extensionfiddlerapihttp-interceptorapi-restpostman-api

Frequently asked questions

Can Requestly run without an internet connection?

Yes, all core features—including the API client, interceptor, and local mocking—operate fully offline; only cloud mock hosting requires connectivity.

Which browsers are supported for the interceptor extension?

Chrome, Firefox, and Edge extensions are provided; they share the same rule engine.

How does Requestly store data securely?

Data is saved in a user‑chosen directory on the local file system; no telemetry is sent unless the optional cloud mock service is used.

Is there a way to sync workspaces across a team?

Team workspaces can be synchronized through any file‑sync service such as Git, Google Drive, or iCloud, using the same folder.

Can I use Requestly in CI pipelines?

Yes, the mock server can be started in headless mode and controlled via CLI or Node SDK for automated testing.

Project at a glance

Active
Stars
6,103
Watchers
6,103
Forks
553
Repo age9 years old
Last commityesterday
Primary languageTypeScript

Last synced yesterday