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Get a full fake REST API with zero coding in less than 30 seconds (seriously)

Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.

HTTP server mocking and expectations library for Node.js

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

Mimesis is a Python library for generating fake but realistic data in multiple languages and locales.

Development tool to mock API endpoints quickly and easily - NOT MAINTAINED

A full-featured BDD unit testing framework for bash, ksh, zsh, dash and all POSIX shells

A mocking and stubbing library for Ruby

Mock HTTPX with awesome request patterns and response side effects 🦋

In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.

DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses.

PHP Mocking Framework

Patch fetch/XMLHttpRequest to fake a REST API server in the browser, based on JSON data.

Mock built-in PHP functions (e.g. time(), exec() or rand())

a socket mock framework - for all kinds of socket animals, web-clients included

Build a fake backend by providing the content of JSON files or JavaScript objects through configurable routes.

:dash: Simple yet powerful file-based mock server with recording abilities

DNS mock server written on 💎 Ruby. Mimic any DNS records for your test environment with fake DNS server.

💎 Ruby SMTP mock. Mimic any 📤 SMTP server behavior for your test environment with fake SMTP server.