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adjeim/CORS Cheat Sheet for Express + TypeScript.md

Last active January 23, 2025 23:42
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  1. adjeim renamed this gist Mar 31, 2021. 1 changed file with 0 additions and 0 deletions.
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    # CORS Cheat Sheet for Express + TypeScript

    1. Install `cors` package and its TypeScript types:
    ```bash
    npm install cors
  4. adjeim created this gist Mar 31, 2021.
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    # CORS Cheat Sheet for Express + TypeScript

    1. Install `cors` package and its TypeScript types:
    ```bash
    npm install cors
    npm install --save-dev @types/cors
    ```

    2. Update the entry point of your Express app to allow your server to use `cors` middleware.
    Configure your CORS options with the origins you would like to allow.
    ```javascript
    import express from 'express';
    import cors from 'cors';

    const app = express();

    // Add a list of allowed origins.
    // If you have more origins you would like to add, you can add them to the array below.
    const allowedOrigins = ['http://localhost:3000'];

    const options: cors.CorsOptions = {
    origin: allowedOrigins
    };

    // Then pass these options to cors:
    app.use(cors(options));

    app.use(express.json());


    app.listen(5000, () => {
    console.log('Express server listening on port 5000');
    });
    ```