Best Mock Servers in 2025

The fastest way to setup you mock endpoint. Your mock API up in just a few clicks, auto generated the RESTfull endpoints you need.

paid Free Trial €3.0 / Monthly (10 resources)

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Key Flagsmith features:

Feature Flags Remote Config A/B/X Testing & Optimization Organization Management

Try for free Open Source freemium

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

Key Mockoon features:

User-Friendly Interface Quick Setup Open Source Cross-Platform Support

Open Source paid Free Trial $15.0 / Monthly (5 API mocks synchronized accross your devices, 1 mock deployed)

MockAPI lets users mock up APIs, generate custom data, and perform operations on it using RESTful interface.

Key MockAPI features:

Ease of Use Customizable Data Multiple Endpoints Time-saving

All-in-One workspace for API Design, Documentation, Debug, Mock, Test.

Key Apidog features:

User-Friendly Interface Comprehensive API Management Collaboration Features Integration Capabilities

freemium $9.0 / Monthly

Generate custom data & API to build apps in less than 30s.

Key Mock API Generator features:

Ease of Use Speed Integration Customization

Test Socket.IO and WebSocket client and server events.

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Easily format, validate, and beautify JSON data with our free online tool. Includes powerful JSON conversion features for seamless data management.

free

A hosted REST-API ready to respond to your AJAX requests.

Key ReqRes features:

Free and Open Access Comprehensive API Endpoints No Authentication Required Static Data

Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds. .

Key Beeceptor features:

Ease of Use Free Tier Instant Mock Endpoints Customizable Responses

freemium $10.0 / Monthly (Per endpoint)

Realtime application framework (Node.JS server).

Key Socket.io features:

Real-time Communication Cross-browser Compatibility Fallback Support Event-driven Architecture

Open Source

Free and open-source mock API for testing and prototyping. Easily create a mock API from JSON data, with the ability to define custom rules for HTTP status codes, headers, and response bodies.

Quickly define some REST or SOAP endpoints and have them return json/xml (dummy) data.

Key Mockable features:

Ease of Use Speed Collaboration Customization