JavaScript Lesson 25 | Fetch API and REST Endpoints | GET. POST. PUT. PATCH. DELETE | API Client

#javascript #fetchapi #restapi Lesson 25: Working with REST endpoints using the Fetch API. Learn GET/POST/PUT/PATCH/DELETE, query params & filtering, handling HTTP status codes, custom headers and authentication (Bearer token / API key), and building a robust API client class with error & content-type handling. Includes practical examples using :contentReference[oaicite:0]{index=0}, patterns for safe JSON parsing, and tips for production-ready requests. What you’ll learn: • Making requests: fetch GET, POST, PUT, PATCH, DELETE and handling responses. • Query params & filtering (`?userId=...&_limit=...`) and pagination basics. • HTTP status handling (200, 201, 400, 401, 403, 404, 5xx) and robust error messages. • Headers & auth: custom headers, Bearer tokens and API key examples. • Building an API client (request, get/post/put/patch/delete) with JSON/text handling and network error mapping. • Best practices: check `response.ok`, avoid swallowing errors, and handle empty/non-JSON responses.