Free-tier mock apis

micro-jaymock

micro-jaymock is a tiny API mocking microservice that accepts a JSON template in a POST request and returns generated fake JSON data. It supports template fields such as names, addresses, finance values, repeated objects, and other fake-data generators exposed through jaymock.

JSONing

JSONing is a developer tool that provides a mock API for testing and prototyping. It can generate a custom API from a JSON object, define resources such as products and users, and apply JSON-based rules to customize HTTP status codes, headers, and response bodies.

Beeceptor

Beeceptor is a mock API server platform for REST, SOAP, GraphQL, and gRPC endpoints. It lets developers upload OpenAPI, WSDL, GraphQL SDL, or proto definitions, or define responses through a no-code UI, then inspect requests, add matching rules, and return dynamic or stateful responses.

Mockfly

Mockfly is a mock API generator that creates REST API endpoints for frontend development, API testing, and rapid prototyping. It supports generating fake JSON responses with Faker.js, AI-assisted JSON...

Mockaroo

Mockaroo is a random data generator and API mocking tool that produces test data in CSV, JSON, SQL, and Excel formats. It lets developers define schemas with fields such as names, email addresses, IP ...

mockapi.io

mockapi.io is a REST API mocking service that lets developers create endpoints, define resource schemas, generate custom data, and perform CRUD-style operations through a RESTful interface.

Keploy

Keploy is an open-source testing platform that records real API traffic with eBPF and replays it in CI as deterministic regression tests, auto-generated mocks, and production-like sandboxes. It suppor...

httpsms.com

httpsms.com is a sandbox web interface for receiving SMS messages on a shared US phone number. It exposes a public inbox that can be used anonymously to view incoming and outgoing text messages in the browser.

mockerito

Mockerito is a cloud-hosted service for creating custom mock REST APIs. Developers define REST endpoints, JSON response bodies, status codes, response delays, and API key authentication from a dashboa...