Learn TypeScript Online
For JavaScript Developers

A free TypeScript course for JavaScript developers covering types, interfaces, generics, narrowing, type-safe APIs, and Next.js integration with browser practice.

25Lessons
100+Code Examples
FreeForever
Try TypeScript in 30 seconds
1console.log("Hello, TypeScript!");
30 sec demo

Why Learn TypeScript?

Discover the benefits of learning TypeScript and how it can enhance your JavaScript development.

Type Safety

Catch errors at compile time with a powerful type system that scales with your codebase.

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Better Tooling

Get intelligent code completion, refactoring, and navigation in your IDE.

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Modern Features

Use the latest ECMAScript features with excellent backwards compatibility.

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Frequently Asked Questions

Is this a free TypeScript course?
Yes. LearningTypeScript.org offers free TypeScript lessons with browser-based practice for types, interfaces, generics, narrowing, async code, and API patterns.
Who should learn TypeScript here?
JavaScript developers get the most value because the course explains TypeScript as a practical upgrade to everyday JavaScript, not as an abstract type theory course.
Can I practice TypeScript without installing Node?
Yes. You can run TypeScript examples in the online playground and use the lessons before setting up a local compiler or project.
What TypeScript topics are covered?
The course covers variables and types, interfaces, generics, utility types, narrowing, React, Next.js, Zod validation, type-safe APIs, and debugging.