JSPM

the open source API testing client

UI for testing API in Cypress

REST API Testing Tool for all levels in a Test Pyramid

Shared testing utilities

HTTP API Testing Framework

Reusable testing utilities that are potentially relevant for both backend and frontend

Frisby.js v2.0: REST API Endpoint Testing built on Jasmine

API testing made easy, fast, and fun

the open source API testing client for react

Easily mock your webservices while testing frontends.

Shared testing utilities

Automated API Testing and Quality Assurance

When API testing slows you down: record and replay HTTP responses like a boss

a library for building a fake REST API for testing

Utility for mocking remote APIs servers for testing purposes

Collection of utility functions and a gherkin framework for REST API integration testing based on cucumber.js

Easily mock your webservices while testing frontends.

REST API Automated Testing

Mock @sanity-typed/client for local development and testing

Mock any API for testing and development.

Core functionality for the ContractCase contract testing suite

Testing utilities for TypeSync - mock generation and type-safe test client

WBCSD PACT API conformance testing tool.

When API testing slows you down, retell HTTP responses

Transparently create an API cache for testing.

Declarative API testing that is fast and simple

ContractCase contract testing suite

Chai and Jest matchers for aws services

Simple and fast DOM integration, headless or headful browser, and REST API testing framework.

Official Postman CLI - Command-line companion for API development, testing, and automation

Library for GitHub Action integration and unit testing

Playwright plugin for comprehensive API testing and result presentation using the Playwright UI, Trace Viewer, and HTML Report. It significantly aids debugging processes and supports both Playwright's native API and Axios requests.

A generic REST API tester for testing HTTP endpoints

Mock payment-protected API server for testing agents (supports x402, AP2, etc.)

Description: Comprehensive testing library for API testing, system monitoring, and step execution tracking

Shared testing utilities

A testing suite by Mapzen with fuzzy testing ability

<div align="center"> <h1>Svelte Testing Library</h1>

A Node.js module for mocking OpenAI-compatible API responses in a development environment with consistency mechanisms for deterministic testing

**A powerful and type-safe WhatsApp Cloud API emulator for testing and development.**

Seamless REST/GraphQL API mocking library for browser and Node.js.

RAML testing tool

API testing made simple

Programmatic multipart file uploads. Designed for testing file uploads.

Stripe webhook & object data for mocking / testing purposes

testing

A fast API testing CLI built in Go

Selenium testing without nested callbacks or promises!

Command-line interface for Postqode API testing framework

Pure in-memory storage helpers for api-server-base authentication; ideal for testing and mocks.

Testing rest api

Simple fetch-based integration testing library for Node.js

HTTP API Testing Framework

Module to test Serverless function with Ts.ED

Utils to test you CLI based on Ts.ED CLI

Testing framework for Eveble applications

Minimal, efficient Next.js API analyzer with Postman-ready testing guides for security, performance, and maintainability

API testing through configuration

Mid testing mock server for client-side testing.

Shared testing utilities

A web-based interface for inspecting and testing Telepact APIs.

Lightweight and fast API testing framework with database checking.

Jest matchers for testing OpenAPI specifications

A flexible JSON schema validation library for API testing with automatic schema generation and synchronous/asynchronous validation support. Perfect for Bruno API client and automated testing.

Observable Integration Testing using OpenTelemetry on top of Jest.

A fast, developer-friendly CLI for exploring and testing REST and GraphQL APIs from the terminal

memlab API

Simple file-based REST API documentation builder with testing

Next-generation contract testing suite

REST API endpoint testing library

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Framework-agnostic integration testing with Testcontainers

Local Twillio API mock server for SMS testing with TypeScript support

Mock NetSuite API and SuiteScript host for testing SuiteQL queries and SuiteScripts without a NetSuite account

Specification-driven REST API testing

Production-grade TypeScript API testing framework with fluent DSL

A better way to use the WireMock simulator to test your HTTP APIs

API documentation generator with a strict grammar and testing tools

Zero-dependency (req,res) handler callback agent for use in client requests

Simply library for testing HTTP servers

Simple, self-documenting and self-testing API helper for Node.js.

Minimalistic tool for API testing.

A comprehensive API testing engine with directory-based execution, global variables, and priority-driven test management.

Shared testing utilities

A simple HTTP server testing tool

Feature-complete NodeJS client for Kaseya Autotask PSA REST API with TypeScript support, comprehensive testing, and CLI tools.

Argos API Client library.

Inspired by aws-serverless-express to work with Fastify with inject functionality.

UI Visual Comparison Testing tool - visual regression testing tool based on Playwright

Express.js API Testing Utility

Expressive, concise json api testing.

A production-ready CLI tool for stress-testing API endpoints to understand rate limits, throttling behavior, and latency characteristics

API testing and data generation made easy

Concise JSON API testing

TaxJar Sales Tax API for Node

Mangopay Node.js SDK for NPM testing purposes

Standalone MCP server for REST API testing and management

Command-line companion utility for Postman

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]

Redux middleware for calling an API.

Use Ky in both Node.js and browsers

Promise based HTTP client for the browser and node.js

The Memory Layer For Your AI Apps

A NodeJS library to interact with the MailHog API

Fast, unopinionated, minimalist web framework

AWS X-Ray plugin for node-fetch

Lob API wrapper

A helper for contract testing using newman

Base reporting library for istanbul

Simple NPM Module for testing the features that the youtube api offer.

A TypeScript client for interacting with Mailpit's REST API.

Shared TypeScript definitions for Octokit projects

Google APIs Authentication Client Library for Node.js

Node.js Google Authentication Service Account Tokens

tiny modular DOM lib for ie9+

A caching proxy server useable in your front-end projects to cache API requests and rewrite their responses as needed to be routed through server - for tradeshows, demos, data that you know will be retired someday, and load testing in shared environments

Turns REST API endpoints into generic request options

Node.js Client SDK for Infobip APIs.

GitHub GraphQL API client for browsers and Node

Octokit plugin to paginate REST API endpoint responses

Error class for Octokit request errors

API testing module to validate the functionality, reliability, and performance of RESTful APIs by automating request and response verification.

Send parameterized requests to GitHub's APIs with sensible defaults in browsers and Node

GitHub API token authentication for browsers and Node.js

Extendable client for GitHub's REST & GraphQL APIs

asynchronous before/error/after hooks for internal functionality

Octokit plugin adding one method for all of api.github.com REST API endpoints

A collection of reusable Playwright step definitions for Cucumber in TypeScript, designed to streamline end-to-end testing across web, API, and mobile applications.

A Facebook chat API

Conversion library for transforming joi schema objects into swagger / OpenApi OAS 3.0 schema definitions.

Converts Zod schemas to Json Schemas

elegant & feature rich browser / node HTTP with a fluent API

Transform SVG into React Components.

Literate testing for HTTP APIs using markdown

Zephyr Scale API SDK to simplify automated testing development.

Suite of utilities for working with the Rivet consumer-driven API contacts testing model.

fake leancloud auth api for testing

A Facebook chat API that doesn't rely on XMPP

Log all requests and request errors

AWS SDK for JavaScript

HTTP API Testing Framework

Simple api testing module

Akamai Netstorage API for Node.js

A mock OpenAI API server for testing LLM applications

The Stacks file system.

Testing JSON data structures using CSS3-like selectors

Confidently unit and integration test your Next.js API routes/handlers in an isolated Next.js-like environment

Stripe API wrapper

JavaScript SDK for Base44 API

Playground for testing npm packages

Google APIs Client Library for Node.js

Official library for using the Slack Platform's Web API

Easy, spec based API test framework for HTTP APIs (REST, GraphQL)

Shared type definitions for the Node Slack SDK

AI-powered frontend-first development toolkit - Build frontends without waiting for backends

Tiny and elegant HTTP client based on the Fetch API

testing

Configuration API

API mocking framework for load and functional API testing

Fast and low overhead web framework, for Node.js

The react client only integration for api references

A simple and composable way to validate data in JavaScript (and TypeScript).

tRPC API for Mock Service Worker (MSW).

Toolchain for testing REST API, in BDD style.

JSON Schemas for every version of the OpenAPI Specification

An express mock api server for testing purposes

This library allows you to test speed with various speed testing sites.

Suite of utilities for working with the Rivet consumer-driven API contacts testing model.

GitHub OAuth Device authentication strategy for JavaScript

Set of stateless request methods to create, check, reset, refresh, and delete user access tokens for OAuth and GitHub Apps

Intuitive, type safe and flexible Store for Vue

Octokit authentication strategy for OAuth clients

Datadog API Node.JS Client

A Twilio helper library

GitHub OAuth App authentication for JavaScript

HTTP API Testing Framework

GitHub App authentication for JavaScript

Docker remote API network layer module.

A CLI tool for testing African-specific APIs and datasets locally and offline, with sandbox environments, mock data generation, and a web interface

Testing REST API made easy.

Storybook addons postinstall utilities

Commit changes back to the repo from a GitLab CI job.

PM2.io API Client for Javascript

Jenkins CI testing of node API servers with Postman/Newman

Synchronous Node.js HTTP for API testing/scripting/automation

Google Maps Javascript API Stub

Fast, type-safe fetch client for your OpenAPI schema. Only 6 kb (min). Works with React, Vue, Svelte, or vanilla JS.

Test Framework for AWS Lambda

Multi Exchange Crypto Currency Trading bot, Data Analysis Library and Strategy Back testing Engine

Octokit plugin for GitHub Enterprise REST APIs

Methods to handle GitHub Webhook requests

compile json schema to typescript typings

SOAP API testing framework

HTTP Mock Server

Extends Cypress' cy commands with methods for administrating Mocks Server

GitHub API token authentication for browsers and Node.js

Mock API requests in Storybook with Mock Service Worker.

GitHub OAuth toolset for Node.js

Plugin framework for writing plugins for the ContractCase test framework

OpenAPI client for Datadog APIs

Node standard library for browser.

TestRail API's

Testing classes for LAPI

The all-batteries-included GitHub SDK for Browsers, Node.js, and Deno

Checkbox with autocomplete and other additions for Inquirer

Shared testing utilities

Lightweight utility for posting messages or JSON payloads to a Discord channel via webhook, with optional dry-run mode for testing.

Fetch-inspired declarative API testing framework

Solana Javascript API

JSON-RPC 1.0/2.0 compliant server and client

Command-line interface for ContractCase, allowing interactions with the Contract / Pact Broker

A plugin for TypeDoc that enables TypeScript API documentation to be generated in Markdown.

Mock Server supporting multiple route variants and mocks

HTTP Server framework

Core API implementation of the GitLab API

Octokit plugin to paginate GraphQL API endpoint responses

Pluggable mock server supporting multiple route variants and mocks

testing commander in global installation

Mocks Server plugin providing an administration REST API

A helper library for wallets to integrate with FiatConnect APIs

A npm package wrapper for OpenAPI Generator (https://github.com/OpenAPITools/openapi-generator), generates which API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Avro for JavaScript

Cross Platform implementation of the GitLab API

When API testing slows you down: record and replay HTTP responses like a boss

Official library for using the Slack Platform's Incoming Webhooks

MCP server for API testing and experimentation - Your API Laboratory

Programmatic API for searching in npm and compatible registries.

simple, stupid, agnostic integration testing for APIs and the mysql databases that serve them

Client for retrieving, creating and patching data from Sanity.io

Programmatic api for `npm org` commands

Allure Newman integration

Lint browser compatibility of API used

Official library for using the Slack Platform's Socket Mode API

Official library for interacting with Slack's Oauth endpoints

Interact with and control an embedded Vimeo Player.

Web application for exploring and testing AWS APIs

Plugin for validating API schemas from API documentation

Legacy Octokit pagination methods from v15

AWS X-Ray SDK for Javascript

A framework for building Slack apps, fast.

YouTube IFrame Player API abstraction.

A simple server-side API for mixpanel

A module for mocking and testing AWS API Gateway in conjunction with Lambda functions.

<div align="center"><img src="https://raw.githubusercontent.com/graphql-hive/graphql-yoga/refs/heads/main/website/public/cover.png" width="720" /></div>

Simple framework for testing js-based API

Compiles HTTP Transactions (Request-Response pairs) from an API description document

Mangopay Node.js SDK

The VuePress API Playground is a Vue.js component for showcasing and testing API use cases in VuePress documentation

Testing server to programmatically test API dependant scripts.

Simple and Powerful Node.js Performance Testing