TypeScript in Express – TypeScript Tutorial

Published: 24 July 2026
on channel: freeCodeCamp.org

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Learn to build a fully typed Express server with TypeScript, covering routes, middleware, data handling, and more.

✏️ Study this course interactively on Scrimba:
https://scrimba.com/learn-typescript-...

Code is available on the Scrimba course page for each lesson.

TypeScript makes Express servers safer, more scalable, and easier to maintain. In this hands-on module, you'll go from setting up a TypeScript-powered Express environment to structuring routes, controllers, and middleware with full type safety. By the end of the video, you'll have the skills to build production-ready Express APIs with confidence.

❤️ Support for this channel comes from our friends at Scrimba – the coding platform that's reinvented interactive learning: https://scrimba.com/freecodecamp

⭐️ Contents ⭐️
0:00:00 Intro to Express & TypeScript
0:02:08 Setting up a Express and TypeScript Environment
0:05:14 Set up your environment
0:07:12 Setting up an Express & TypeScript project
0:10:15 Running an Express & TypeScript project
0:13:17 Typing Express data
0:15:34 Restarting the Express server
0:19:22 Typing the real data
0:23:40 Request and Response types
0:26:29 cors and TypeScript
0:29:13 Typing the 404 catch-all
0:31:19 Automating the server restart
0:32:56 A more specific Response
0:35:25 A more specific Request
0:39:03 Non-existent IDs
0:41:31 String query params
0:44:43 An even more specific Request
0:47:27 Boolean query params
0:51:00 Number query params
0:54:05 Separating concerns with Router
0:59:15 Separating concerns with controllers
1:03:13 Adding and typing middleware
1:08:53 Your own middleware
1:13:30 Congratulations!

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