Scalar Has a Free API — Beautiful API Documentation in Seconds

TL;DR Scalar is an open-source API reference generator that turns your OpenAPI/Swagger spec into beautiful, interactive documentation. It's free, customizable, and includes a built-in API client for testing endpoints. What Is Scalar? Scalar is a modern alternative to Swagger UI and Redoc: Beautiful by default — dark/light themes, clean typography Interactive API client — test endpoints right from the docs OpenAPI 3.x support — full spec compliance Multiple integrations — Express, Fastify, Hono, Next.js, NestJS Customizable — themes, layouts, authentication Free and open source — MIT license Quick Start with Express npm install @scalar/express-api-reference import express from " express " ; import { apiReference } from " @scalar/express-api-reference " ; const app = express (); app . use ( " /docs " , apiReference ({ spec : { url : " /openapi.json " , }, theme : " purple " , }) ); app . get ( " /openapi.json " , ( req , res ) => { res . json ({ openapi : " 3.1.0 " , info : { title : " M