Is this TypeScript playground free to use?

Yes, the DevsCurry TypeScript playground is completely free, requires no signup, and runs entirely in your browser.

Does the playground check TypeScript types and report errors?

Yes, your code is processed by the TypeScript compiler directly in the browser. Type errors and syntax diagnostics are reported before execution.

How does TypeScript run in the browser?

The playground uses the TypeScript compiler to transpile your TypeScript code to ES2020 JavaScript client-side, which then runs safely in a sandboxed Web Worker.

Can I format my TypeScript code automatically?

Yes, the playground includes an integrated Prettier TypeScript formatter. Press Ctrl+S / Cmd+S or click the Format button to tidy your code.

Can I switch between TypeScript and JavaScript without losing my code?

Yes, each language maintains its own independent workspace and file tabs. Switching tabs keeps your work intact and auto-saved.

TypeScript Playground - Run TS Code Online

Name: TypeScript Playground - Run TS Code Online | DevsCurry
Brand: DevsCurry

Welcome to the DevsCurry TypeScript Playground, a full-featured browser-based development environment for TypeScript. Write, transpile, type-check, and execute TypeScript code instantly without setting up `tsconfig.json`, Node.js, or local compilers.

Interactive TypeScript Starter Code

Experiment with typed functions, array transformations, and console streaming right out of the box:

function fibonacci(n: number): number {
  return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
}

const sequence: number[] = Array.from({ length: 10 }, (_, i) => fibonacci(i));
console.log('Fibonacci sequence:', sequence);

Key Features & Technical Specifications

In-Browser Type Checking: Powered by the official TypeScript compiler, catching type mismatches, missing properties, and syntax errors before execution.
Modern Language Support: Full support for interfaces, type aliases, generics, union types, enums, utility types, and optional chaining.
Client-Side Transpilation: Code compiles directly to ES2020 JavaScript in your browser and executes inside an isolated Web Worker for maximum privacy and performance.
Monaco Editor: Rich code intelligence with type hover tooltips, error squiggles, syntax highlighting, and auto-indentation.
Built-In Prettier Formatter: Automatically format TypeScript files according to industry standards with a single click or keyboard shortcut.
Vim & Emacs Keybindings: Work with standard cursor controls or switch to complete Vim or Emacs emulation modes.
Execution Protection: 10-second infinite loop timeout prevents browser freezes.

Popular TypeScript Examples & Patterns

Explore real-world TypeScript patterns with ready-to-run code snippets:

Interfaces and Generics in TypeScript – Write reusable, strongly-typed functions with generic type constraints.
Enums and Numeric/String Constants – Define enumerable sets and map structured values.
Type Narrowing & Discriminated Unions – Use typeof and equality checks to safely refine union types.

Frequently Asked Questions (FAQ)

Is this TypeScript playground free to use?: Yes, the DevsCurry TypeScript playground is completely free, requires no signup, and runs entirely in your browser.
Does the playground check TypeScript types and report errors?: Yes, your code is processed by the TypeScript compiler directly in the browser. Type errors and syntax diagnostics are reported before execution.
How does TypeScript run in the browser?: The playground uses the TypeScript compiler to transpile your TypeScript code to ES2020 JavaScript client-side, which then runs safely in a sandboxed Web Worker.
Can I format my TypeScript code automatically?: Yes, the playground includes an integrated Prettier TypeScript formatter. Press Ctrl+S / Cmd+S or click the Format button to tidy your code.
Can I switch between TypeScript and JavaScript without losing my code?: Yes, each language maintains its own independent workspace and file tabs. Switching tabs keeps your work intact and auto-saved.