CodeUtility
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Online TypeScript Compiler

Write, compile, run, and debug TypeScript online in a full-featured browser IDE. Manage multiple files and packages, save your workspace, and collaborate in real time.

Pre-installed Libs
🚀 254 total executions (254 this month)

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🌀 About This TypeScript Online Executor

The CodeUtility TypeScript Executor lets you write and run TypeScript code directly in your browser - no compiler setup, Node.js installation, or local environment required. It runs real TypeScript code compiled to JavaScript inside a secure, sandboxed runtime.

This environment currently supports TypeScript 5.4, giving you access to the latest language features such as decorators, improved type inference, and modern ECMAScript support.

Whether you're learning TypeScript, testing utility functions, or experimenting with typing and interfaces, this tool provides a fast and interactive way to write, compile, and execute your code with instant feedback.

It’s perfect for developers who want to explore TypeScript’s type system or verify how TypeScript compiles to JavaScript without switching between editors or local terminals.

More than a code runner

Use a multi-file editor, an isolated execution terminal, runtime-specific libraries, persistent workspaces, sharing, and real-time collaboration from the same executor.

How to use this executor?

Choose a runtime, open or create a file, write your code, and select Run. Output appears in the terminal, while signed-in users can keep files in a workspace, install libraries, and collaborate through shares.

  1. Select a version and edit the current file or open another workspace file.
  2. Run the code, provide input in the terminal when requested, and review saved run history.
  3. Use libraries, workspace tools, sharing, and chat when your task needs more than one snippet.

💡 TypeScript Basics Guide for Beginners

1. Declaring Variables

TypeScript allows static typing with let, const, and type annotations.

let x: number = 10;
const pi: number = 3.14;
let name: string = "Alice";
let isActive: boolean = true;

2. Conditionals (if / switch)

Use if, else if, and else for branching. switch handles multiple values.

let x = 5;
if (x > 0) {
  console.log("Positive");
} else if (x < 0) {
  console.log("Negative");
} else {
  console.log("Zero");
}

switch (x) {
  case 1:
    console.log("One");
    break;
  case 2:
    console.log("Two");
    break;
  default:
    console.log("Other");
}

3. Loops

Use for, while, and for...of for iteration.

for (let i = 1; i <= 5; i++) {
  console.log(i);
}

let i = 5;
while (i > 0) {
  console.log(i);
  i--;
}

4. Arrays

Use square brackets [] to define arrays.

let numbers: number[] = [1, 2, 3, 4, 5];
let names: string[] = ["Alice", "Bob"];
console.log(numbers[1]);

5. Array Manipulation

Use built-in methods like push, splice, and filter.

let arr = [10, 20, 30];
arr.push(40);          // Append
arr.splice(1, 1);      // Remove second element
console.log(arr);

6. Console Input/Output

Use console.log to display output in the console.

const name: string = "Alice";
console.log("Hello, " + name);

7. Functions

Declare functions with typed parameters and return values.

function add(a: number, b: number): number {
  return a + b;
}

console.log(add(3, 5));

8. Maps

Use plain objects or Map for key-value structures.

const m = new Map<string, number>();
m.set("Alice", 25);
console.log(m.get("Alice"));

9. Exception Handling

Use try and catch to handle errors.

try {
  throw new Error("Something went wrong");
} catch (e) {
  console.error(e.message);
}

10. File I/O (Node.js only)

Use Node.js fs module to read and write files.

import * as fs from "fs";

fs.writeFileSync("file.txt", "Hello File");
const content = fs.readFileSync("file.txt", "utf-8");
console.log(content);

11. String Manipulation

Use string methods like length, concat, includes.

let str = "Hello World";
console.log(str.length);
console.log(str + "!");
console.log(str.includes("World"));

12. Classes & Objects

TypeScript supports object-oriented programming.

class Person {
  name: string;
  constructor(name: string) {
    this.name = name;
  }
  greet() {
    console.log(\`Hi, I'm \${this.name}\`);
  }
}

const p = new Person("Alice");
p.greet();