The best Api Testing tools and resources on the internet.

Over 44+ awesome Api Testing tools and resources on the internet to supercharge your testing.

R

REST Assured NET

Free

Brings the power of REST Assured to the C# / .NET ecosystem by Simplifying HTTP Testing

API Testing
P

Portman

Free

Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman

API Testing
c

cypress-ajv-schema-validator

Free

Streamlining JSON Schema Validation in Cypress

Data
API Tester

API Tester

Free

Mobile app for iOS and Android for testing and using APIs.

API Testing
SuperTest

SuperTest

Free

Simplifying HTTP Assertions for Node.js

API Testing
P

PlayPI

Free

Your Local API Testing Playground.

API Testing
Fake API

Fake API

Free

Free public API to test API endpoints and retrieve dummy JSON data swiftly.

API Testing
OpenAPI AutoSpec

OpenAPI AutoSpec

Free

Automatically generates OpenAPI specifications in real-time.

API Testing
Keploy

Keploy

Free

Generate tests and stubs for your application that actually work!

API Testing
Firecamp

Firecamp

Free Plan

Design, develop, test, and document their APIs effortlessly.

API Testing
gaxios

gaxios

Free

An HTTP request client that provides an Axios-like interface over top of node-fetch.

API Testing
Bruno

Bruno

Free

Opensource IDE For Exploring and Testing Api's (lightweight alternative to postman/insomnia)

API Testing
Mokku

Mokku

Free

Mock API calls seamlessly

API Testing
OpenAPI DevTools

OpenAPI DevTools

Free

Chrome extension that generates API specs for any app or website

API Testing
PactumJS

PactumJS

Free

A REST API testing tool to automate e2e, integration, contract,Β and component (or service-level) tests.

API Testing
F

Fetchbook

Free

CLI tool to run and test your HTTP requests. Git friendly, 100% local.

API Testing
RecipeUI

RecipeUI

Free

Open source Postman alternative with type safety built in.

API Testing
Insomnium

Insomnium

Free

Privacy-focused and 100% local API testing tool.

API Testing
P

Postman Contract Test Generator

Free

Dynamic Test Generation with Open API Spec 3.0 and Postman

API Testing
GraphQL Network Inspector

GraphQL Network Inspector

Free

A better network inspector for viewing and debugging GraphQL requests in Chrome and Firefox.

API Testing
Thunder Client- VS Code

Thunder Client- VS Code

Free

Thunder Client is a lightweight Rest API Client Extension for Visual Studio Code

API Testing
snapstub

snapstub

Free

Snapshot-based stub/mocking of APIs.

API Testing
ezy

ezy

Free

GUI client for gRPC/gRPC-Web

API Testing
ProAutoma API Tester

ProAutoma API Tester

Free with Paid Plan

Online REST API client

API Testing
Mockoon

Mockoon

Free with Paid Plan

Create mock APIs in seconds

API Testing
Mock Service Worker

Mock Service Worker

Free

Mock API by intercepting requests on the network level. Seamlessly reuse the same mock definition for testing, development, and debugging.

API Testing
Mocks Server

Mocks Server

Free

Node.js mock server running live, interactive mocks in place of real APIs

API Testing
Dummy

Dummy

Free

Run mock server based off an API contract with one command

API Testing
J

Json Model Validator

Free

A flexible, lightweight JSON Data validator and formatter

API Testing
OC Mock

OC Mock

Free

mock object testing framework that can be used to create stubs in iOS apps.

API Testing
Advanced REST Client

Advanced REST Client

Free

A better API testing tool

API Testing
v

vcrpy

Free

Automatically mock your HTTP interactions to simplify and speed up testing

API Testing
ReqBin

ReqBin

Free

ReqBin is an online API testing tool for REST and SOAP APIs.

API Testing
httpbin.org

httpbin.org

Free

HTTP Request & Response Service, written in Python + Flask.

API Testing
M

Moq

Free

The most popular and friendly mocking framework for .NET

API Testing
URL Fetch

URL Fetch

Free

Code Generator for HTTP Requests

API Testing
Learn REST: A RESTful Tutorial

Learn REST: A RESTful Tutorial

Free

Learn everything there is to know about REST apis with the this opensource resource.

API Testing
Ajv JSON schema validator

Ajv JSON schema validator

Free

Security and reliability for JavaScript applications

API Testing
Prestige

Prestige

Free

A text-based HTTP client in the browser, an interface-less Postman.

API Testing
Health Check Api

Health Check Api

Free

An easy way to execute a health check against your API endpoint.

API Testing
Mountebank

Mountebank

Free

Over the wire test doubles

API Testing
mitmproxy

mitmproxy

Free

It’s a free and open source interactive HTTPS proxy

API Testing
Curl

Curl

Free

command line tool and library for transferring data with URLs

API Testing
Postman

Postman

Free version

API Testing Tool

API Testing