TypeScript Online Compiler / Playground
Write, compile, and test TypeScript code online with our free Online TypeScript Compiler / Playground. Practice static typing, interfaces, functions, classes, generics, and modern TypeScript syntax while transpiling supported code to JavaScript without installing Node.js or configuring the TypeScript compiler (tsc) locally.
How to Use This TypeScript Compiler
- Write or paste your TypeScript code
Enter TypeScript in the Code Editor. You can use type annotations, interfaces, arrays, objects, classes, generics, unions, and other supported TypeScript features. - Click the Run button
Select Run to compile and execute your code using the pre-configured TypeScript environment. Modify the code and run it again to quickly test another example. - Check the Output terminal
View compilation messages, runtime results, or generated output in the Output terminal. Use the available copy, download, and delete controls to manage your result.
Key Features
- Instant TypeScript Compilation: Compile supported TypeScript code directly in your browser.
- Zero Installation: No Node.js, npm,
tsc, or local TypeScript setup required. - Pre-Configured TS Environment: Start testing TypeScript immediately without creating a project.
- Static Type Checking: Experiment with typed variables, parameters, return values, and objects.
- Interfaces & Type Aliases: Practice structured object types and reusable type definitions.
- Classes & Generics: Test object-oriented TypeScript and reusable generic functions.
- Modern JavaScript Features: Use arrow functions, destructuring, template literals, async syntax, and other supported features.
- Instant Execution: Click Run and quickly inspect the result.
- Dark & Light Mode: Switch editor themes for comfortable coding.
- Output Controls: Copy, download, or clear output directly from the terminal.
1. How do I write and transpile TypeScript code to JavaScript here?
Write TypeScript normally in the Code Editor. For example:
You can also define typed functions:
TypeScript removes type information during transpilation and produces JavaScript that can be executed by a JavaScript runtime.
For example, this TypeScript:
transpiles conceptually to JavaScript similar to:
Enter your code, click Run, and inspect the result in the Output terminal.
2. Do I need to install the TypeScript compiler (tsc) or Node.js locally to use this tool?
No. The playground provides a pre-configured TypeScript environment for supported examples, so you can test TypeScript without installing Node.js, npm, or the tsc command-line compiler.
For example:
A local Node.js and TypeScript setup may still be useful for production applications, npm dependencies, frameworks, build tools, and multi-file projects.
3. Is this online compiler suitable for testing type annotations and interfaces?
Yes. It is useful for practicing TypeScript’s static type system.
A basic interface example:
You can also use optional properties:
Union types can also be tested:
These examples help you understand how TypeScript catches many type-related mistakes before JavaScript execution.
4. Can I copy or download my compiled output code?
Yes. After compiling or running your TypeScript code, use the copy or download controls available in the Output panel.
For example:
You can also experiment with generics:
If the playground displays transpiled JavaScript, you can copy or download that generated code. If it displays program output instead, the same controls can be used to save the execution result.
The Online TypeScript Compiler / Playground is useful for JavaScript and TypeScript developers, programmers, and students who want to practice static typing, interfaces, functions, generics, classes, and TypeScript-to-JavaScript compilation without configuring a local development environment.