NodeJS Tutorial in Hindi #77 - What is CORS, Why It Happens, and How to Fix It ?

Publicado el: 18 noviembre 2025
en el canal de: Mohit Decodes

208

In this video, you will learn what CORS (Cross-Origin Resource Sharing) is, why it causes errors in frontend–backend communication, and how to fix CORS issues in Node.js using Express.

We will clearly understand why browsers block API requests, how the Same-Origin Policy works, and how to properly enable CORS using the cors package. Finally, we will test and verify the issue with a frontend request.

This is a practical and beginner-friendly guide to solving one of the most common Node.js API errors.

📘 What You’ll Learn
-- What is CORS?
-- Why CORS errors appear in browsers
-- Understanding Same-Origin Policy
-- How to enable CORS in Node.js + Express
-- Using the cors npm package
-- Allowing specific domains, methods & headers
-- Fixing CORS in development & production
-- Testing and verifying the fix
-- Common mistakes developers make

⚙️ Tech Used
Node.js, Express.js, CORS Package, REST API Testing (Thunder Client/Postman)

📢 Resources:
👉 NodeJS Documentation -https://nodejs.org/docs/latest/api/
👉 ExpressJS Documentation -https://expressjs.com/en/starter/inst...
👉 MongoDB Documentation -https://www.mongodb.com/docs/
👉 VS Code Download Link - https://code.visualstudio.com/
👉 Github Code Download Link - https://github.com/mohitdjcet/mongoDB...

📂 Playlist Links:
NodeJS Full Course Video (Hindi):    • Complete Node.js + Express.js + MongoDB Co...
JavaScript Full Course Video (Hindi):    • JavaScript Full Course 2025  | 4 Projects ...
React 19 Full Course Video (Hindi):    • ReactJS Full Course in Hindi – Beginner to...
HTML Full Course Video (Hindi):    • HTML Full Course with Live Project | Learn...
CSS Full Course Video (Hindi):    • CSS Full Course in 2 Hours (2025) | Beginn...
Git and GitHib Copilot Full Course Video (Hindi):    • GitHub Copilot Full Course in 1 Video | Gi...
Python Full Course Video (Hindi):    • Python Full Course in Hindi 2025 | Complet...
Django Full Course Video (Hindi):    • Django Tutorial in Hindi 2026 | Complete D...

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#mohitdecodes #nodejs #cors #expressjs #javascript #backend #webdevelopment #api #codingtutorial #restapi #programming #fullstackdevelopment

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