The Developer's Guide to API Mocking & Test Data

Find the right tools for mocking APIs, generating test data, and building reliable tests. Curated for modern development workflows.

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HTTP Interception

5 tools

Mock Server

9 tools

Spec-Based Mocking

3 tools

Contract Testing

2 tools

Test Data Generation

4 tools

Hosted Mocks

2 tools

Record & Replay

4 tools

Popular Tools

Beeceptor

Quick HTTP mocking without local setup or installation

Hosted MocksMock Server

Chance

Minimalist random generator for strings, numbers, and complex data structures

Test Data Generation

Faker

Generating massive amounts of realistic fake data for testing

Test Data Generation

Fishery

Type-safe factories for building test objects with sensible defaults

Test Data Generation

Hoverfly

Service virtualization and API simulation with record/replay and templating

Mock ServerRecord & Replay

json-server

Spinning up a full fake REST API from a JSON file in seconds

Mock Server
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Latest Guides

MSW vs Nock vs Polly.js: Which HTTP Mocking Tool?

Compare three popular JavaScript HTTP mocking libraries and find the right fit for your project.

Spec-First Mocking with Prism and OpenAPI

Generate mock servers directly from your OpenAPI specifications.

Mocking APIs in React Native with Mockifyer

Record and replay HTTP interactions in React Native apps.

All Guides →