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Guides for front-end developers

Why browsers block cross-origin requests, how to read the errors, and how to call the APIs you need without leaking credentials.

September 1, 2026 9 min read CORSFundamentals

What is CORS? A practical guide for frontend developers

Why browsers block cross-origin requests, how preflight works, how to read the error in your console, and the three ways to fix it.
August 28, 2026 7 min read CORSNext.js

How to fix CORS errors in Next.js

Route handlers, rewrites, configuring the API, or a CORS proxy: which fix to use for an Access-Control-Allow-Origin error in a Next.js app, with code for each.

What is CORS? A practical guide for frontend developers