API Development Tools Repositories

axios

by axios

Total Stargazers:109218

Total Subscribers:1178

Promise based HTTP client for the browser and node.js

hoppscotch

by hoppscotch

Total Stargazers:80290

Total Subscribers:508

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

json-server

by typicode

Total Stargazers:75703

Total Subscribers:981

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

requests

by psf

Total Stargazers:54302

Total Subscribers:1317

A simple, yet elegant, HTTP library.

okhttp

by lysine-dev

Total Stargazers:47064

Total Subscribers:1628

A meticulous HTTP client for the JVM, Android, and GraalVM.

bruno

by usebruno

Total Stargazers:46910

Total Subscribers:114

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

jsoncrack.com

by AykutSarac

Total Stargazers:44395

Total Subscribers:231

✨ Innovative and open-source visualization application that transforms various data formats, such as JSON, YAML, XML and CSV into interactive graphs.

ccxt

by ccxt

Total Stargazers:43965

Total Subscribers:952

A unified trading API with more than 100 crypto exchanges and prediction markets in JavaScript / TypeScript / Python / C# / PHP / Go / Java / Rust

retrofit

by lysine-dev

Total Stargazers:43936

Total Subscribers:1542

A type-safe HTTP client for Android and the JVM

curl

by curl

Total Stargazers:42836

Total Subscribers:774

A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features

Alamofire

by Alamofire

Total Stargazers:42421

Total Subscribers:1053

Elegant HTTP Networking in Swift

insomnia

by Kong

Total Stargazers:40005

Total Subscribers:249

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

mihomo

by MetaCubeX

Total Stargazers:34038

Total Subscribers:152

A simple Python Pydantic model for Honkai: Star Rail parsed data from the Mihomo API.

swagger-ui

by swagger-api

Total Stargazers:29010

Total Subscribers:623

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

discord.js

by discordjs

Total Stargazers:26821

Total Subscribers:425

A powerful JavaScript library for interacting with the Discord API

openapi-generator

by OpenAPITools

Total Stargazers:26737

Total Subscribers:221

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

flatbuffers

by google

Total Stargazers:26452

Total Subscribers:627

FlatBuffers: Memory Efficient Serialization Library

redoc

by Redocly

Total Stargazers:25907

Total Subscribers:297

📘 OpenAPI/Swagger-generated API Reference Documentation

freellmapi

by tashfeenahmed

Total Stargazers:25705

Total Subscribers:121

7.4 billion tokens per month. 34 free LLM providers. 635 free model endpoints. All behind one /v1 endpoint, plus any custom OpenAI-compatible endpoint. Smart routing, automatic failover, encrypted keys. Personal experimentation only.

guzzle

by guzzle

Total Stargazers:23454

Total Subscribers:433

Guzzle, an extensible PHP HTTP client

api-guidelines

by microsoft

Total Stargazers:23332

Total Subscribers:635

Microsoft REST API Guidelines

yaak

by mountain-loop

Total Stargazers:19209

Total Subscribers:48

The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬

hurl

by Orange-OpenSource

Total Stargazers:19195

Total Subscribers:60

Hurl, run and test HTTP requests with plain text.

msw

by mswjs

Total Stargazers:18202

Total Subscribers:67

Industry standard API mocking for JavaScript.

swagger-codegen

by swagger-api

Total Stargazers:17787

Total Subscribers:409

swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.

ky

by sindresorhus

Total Stargazers:17068

Total Subscribers:64

🌳 Tiny & elegant JavaScript HTTP client based on the Fetch API

graphiql

by graphql

Total Stargazers:16906

Total Subscribers:236

GraphiQL & the GraphQL LSP Reference Ecosystem for building browser & IDE tools.

superagent

by forwardemail

Total Stargazers:16637

Total Subscribers:221

Ajax for Node.js and browsers (JS HTTP client). Maintained for @forwardemail, @ladjs, @spamscanner, @breejs, @cabinjs, and @lassjs.

scalar

by scalar

Total Stargazers:16092

Total Subscribers:37

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

whistle

by avwo

Total Stargazers:15684

Total Subscribers:207

HTTP, HTTP2, HTTPS, Websocket debugging proxy

httpx

by encode

Total Stargazers:15476

Total Subscribers:150

A next generation HTTP client for Python. 🦋

Moya

by Moya

Total Stargazers:15356

Total Subscribers:243

Network abstraction layer written in Swift.

got

by sindresorhus

Total Stargazers:14942

Total Subscribers:108

🌐 Human-friendly and powerful HTTP request library for Node.js

nvim-lspconfig

by neovim

Total Stargazers:13944

Total Subscribers:80

Quickstart configs for Nvim LSP

quicktype

by glideapps

Total Stargazers:13865

Total Subscribers:95

Generate types and converters from JSON, Schema, and GraphQL

FreeRDP

by FreeRDP

Total Stargazers:13679

Total Subscribers:380

FreeRDP is a free remote desktop protocol library and clients

swag

by swaggo

Total Stargazers:13016

Total Subscribers:113

Automatically generate RESTful API documentation with Swagger 2.0 for Go.

dio

by cfug

Total Stargazers:12838

Total Subscribers:161

A powerful HTTP client for Dart and Flutter, which supports global settings, Interceptors, FormData, aborting and canceling a request, files uploading and downloading, requests timeout, custom adapters, etc.

grpcurl

by fullstorydev

Total Stargazers:12811

Total Subscribers:77

Like cURL, but for gRPC: Command-line tool for interacting with gRPC servers

posting

by darrenburns

Total Stargazers:12400

Total Subscribers:28

The modern API client that lives in your terminal.

jsoneditor

by josdejong

Total Stargazers:12264

Total Subscribers:224

A web-based tool to view, edit, format, and validate JSON

google-api-nodejs-client

by googleapis

Total Stargazers:12245

Total Subscribers:350

Google's officially supported Node.js client library for accessing Google APIs. Support for authorization and authentication with OAuth 2.0, API Keys and JWT (Service Tokens) is included.

reqwest

by seanmonstar

Total Stargazers:11818

Total Subscribers:85

An easy and powerful Rust HTTP Client

resty

by go-resty

Total Stargazers:11797

Total Subscribers:91

Simple HTTP, REST, and SSE client library for Go

buf

by bufbuild

Total Stargazers:11431

Total Subscribers:73

The best way of working with Protocol Buffers.

go-github

by google

Total Stargazers:11306

Total Subscribers:206

Go library for accessing the GitHub v3 API

graphql-code-generator

by dotansimha

Total Stargazers:11262

Total Subscribers:75

A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for custom plugins.

tweepy

by tweepy

Total Stargazers:11176

Total Subscribers:261

Twitter for Python!

wuzz

by asciimoo

Total Stargazers:10733

Total Subscribers:163

Interactive cli tool for HTTP inspection

mailpit

by axllent

Total Stargazers:10351

Total Subscribers:26

An email and SMTP testing tool with API for developers

go-swagger

by go-swagger

Total Stargazers:10009

Total Subscribers:112

Swagger 2.0 implementation for go

boto3

by boto

Total Stargazers:9902

Total Subscribers:228

Boto3, an AWS SDK for Python

RestSharp

by restsharp

Total Stargazers:9825

Total Subscribers:415

Simple REST and HTTP API Client for .NET

google-api-php-client

by googleapis

Total Stargazers:9812

Total Subscribers:556

A PHP client library for accessing Google APIs

feign

by OpenFeign

Total Stargazers:9797

Total Subscribers:396

Feign makes writing java http clients easier

apihub

by hiteshchoudhary

Total Stargazers:9765

Total Subscribers:73

Your own API Hub to learn and master API interaction. Ideal for frontend, mobile dev and backend developers.

check-if-email-exists

by reacherhq

Total Stargazers:9674

Total Subscribers:65

Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.

mitmproxy2swagger

by alufers

Total Stargazers:9606

Total Subscribers:30

Automagically reverse-engineer REST APIs via capturing traffic

refit

by reactiveui

Total Stargazers:9568

Total Subscribers:165

The automatic type-safe REST library for .NET Core, Xamarin and .NET. Heavily inspired by Square's Retrofit library, Refit turns your REST API into a live interface.

API Development Tools

API clients, OpenAPI tooling, SDK generators and API mocking.

axios

by axios

Promise based HTTP client for the browser and node.js

hoppscotch

by hoppscotch

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

json-server

by typicode

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

requests

by psf

A simple, yet elegant, HTTP library.

okhttp

by lysine-dev

A meticulous HTTP client for the JVM, Android, and GraalVM.

bruno

by usebruno

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

jsoncrack.com

by AykutSarac

✨ Innovative and open-source visualization application that transforms various data formats, such as JSON, YAML, XML and CSV into interactive graphs.

ccxt

by ccxt

A unified trading API with more than 100 crypto exchanges and prediction markets in JavaScript / TypeScript / Python / C# / PHP / Go / Java / Rust

retrofit

by lysine-dev

A type-safe HTTP client for Android and the JVM

curl

by curl

A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features

Alamofire

by Alamofire

Elegant HTTP Networking in Swift

insomnia

by Kong

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

mihomo

by MetaCubeX

A simple Python Pydantic model for Honkai: Star Rail parsed data from the Mihomo API.

swagger-ui

by swagger-api

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

discord.js

by discordjs

A powerful JavaScript library for interacting with the Discord API

openapi-generator

by OpenAPITools

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

flatbuffers

by google

FlatBuffers: Memory Efficient Serialization Library

redoc

by Redocly

📘 OpenAPI/Swagger-generated API Reference Documentation

freellmapi

by tashfeenahmed

7.4 billion tokens per month. 34 free LLM providers. 635 free model endpoints. All behind one /v1 endpoint, plus any custom OpenAI-compatible endpoint. Smart routing, automatic failover, encrypted keys. Personal experimentation only.

guzzle

by guzzle

Guzzle, an extensible PHP HTTP client

api-guidelines

by microsoft

Microsoft REST API Guidelines

yaak

by mountain-loop

The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬

hurl

by Orange-OpenSource

Hurl, run and test HTTP requests with plain text.

msw

by mswjs

Industry standard API mocking for JavaScript.

swagger-codegen

by swagger-api

swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.

ky

by sindresorhus

🌳 Tiny & elegant JavaScript HTTP client based on the Fetch API