Understand CORS - Why your api getting blocked
Your API works perfectly in Postman…
but fails in the browser?
That’s CORS.
In this video, we break down CORS step by step — not just how to fix it, but how it actually works internally.
You’ll learn:
• What is CORS
• What is Same Origin Policy
• Why browsers block your API
• How to fix it in Node.js / Express
• What is preflight request (OPTIONS)
If you’re a developer who wants to understand backend logic instead of copying fixes — this is for
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#CORS #WebDevelopment #Backend #JavaScript #NodeJS #SystemDesign #SoftwareEngineering