Best Tools For API Testing

Validate your API's functionality with these top tools and resources. Our collection features free and paid options for testing APIs, gRPC requests, GraphQL queries and service mocking.

Bruno logo

Bruno

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

API Testing
Free
Mokku logo

Mokku

Mock API calls seamlessly

API Testing
Free
Mountebank logo

Mountebank

Over the wire test doubles

API Testing
Free
snapstub logo

snapstub

Snapshot-based stub/mocking of APIs.

API Testing
Free
Insomnium logo

Insomnium

Privacy-focused and 100% local API testing tool.

API Testing
Free
OpenAPI DevTools logo

OpenAPI DevTools

Chrome extension that generates API specs for any app or website

API Testing
Free
PactumJS logo

PactumJS

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

API Testing
Free
F

Fetchbook

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

API Testing
Free
RecipeUI logo

RecipeUI

Open source Postman alternative with type safety built in.

API Testing
Free
P

Postman Contract Test Generator

Dynamic Test Generation with Open API Spec 3.0 and Postman

API Testing
Free
GraphQL Network Inspector logo

GraphQL Network Inspector

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

API Testing
Free
Firecamp logo

Firecamp

Firecamp is multi protocol API platform for Developers.

API Testing
Free with Paid Option
Thunder Client- VS Code logo

Thunder Client- VS Code

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

API Testing
Free
ezy logo

ezy

GUI client for gRPC/gRPC-Web

API Testing
Free
ProAutoma API Tester logo

ProAutoma API Tester

Online REST API client

API Testing
Free with Paid Plan
Mockoon logo

Mockoon

Create mock APIs in seconds

API Testing
Free with Paid Plan
Mock Service Worker logo

Mock Service Worker

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

API Testing
Free
Mocks Server logo

Mocks Server

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

API Testing
Free
Dummy logo

Dummy

Run mock server based off an API contract with one command

API Testing
Free
J

Json Model Validator

A flexible, lightweight JSON Data validator and formatter

API Testing
Free
OC Mock logo

OC Mock

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

API Testing
Free
Advanced REST Client logo

Advanced REST Client

A better API testing tool

API Testing
Free
v

vcrpy

Automatically mock your HTTP interactions to simplify and speed up testing

API Testing
Free
ReqBin logo

ReqBin

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

API Testing
Free
httpbin.org logo

httpbin.org

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

API Testing
Free
M

Moq

The most popular and friendly mocking framework for .NET

API Testing
Free
URL Fetch logo

URL Fetch

Code Generator for HTTP Requests

API Testing
Free
Learn REST: A RESTful Tutorial logo

Learn REST: A RESTful Tutorial

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

API Testing
Free
Ajv JSON schema validator logo

Ajv JSON schema validator

Security and reliability for JavaScript applications

API Testing
Free
Prestige logo

Prestige

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

API Testing
Free
Health Check Api logo

Health Check Api

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

API Testing
Free
SuperTest logo

SuperTest

HTTP assertions made easy via superagent

API Testing
Free
mitmproxy logo

mitmproxy

It’s a free and open source interactive HTTPS proxy

API Testing
Free
Curl logo

Curl

command line tool and library for transferring data with URLs

API Testing
Free