CORS

Lesson in the Frontend Developer Roadmap · Stage 22: Web Security

Last updated 14 September 2026

What is CORS?

CORS (Cross-Origin Resource Sharing) controls web page access to resources from different domains through HTTP headers. Servers specify allowed origins while browsers send preflight requests for permission. Prevents unauthorized access while enabling legitimate cross-origin requests for modern multi-domain applications.

Study this in the interactive course See the whole Frontend roadmap

Free resources to learn CORS

ArticleCross-Origin Resource Sharing (CORS)
ArticleUnderstanding CORS
VideoCORS in 6 minutes

CORS: common questions

Can I learn CORS in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain CORS in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this CORS tutorial for beginners?

It is lesson 68 of 120 in the free Frontend roadmap, in stage 22, Web Security. If you are new to Frontend, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.