TypeScript to JavaScript Converter Online

This TypeScript to JavaScript converter compiles or converts TS code into clean ES6 JS right in your browser. Paste, write, or upload TypeScript scripts, select transpilation and formatting settings, and obtain optimized vanilla JavaScript ready for copying or downloading, without any external transmission.

Key Features

  • Transpile TypeScript to JavaScript instantly in the browser
  • Select target ECMAScript version like ES5 or ES6 for compatibility
  • Enable inline source maps or strict mode for enhanced debugging and checks
  • Integrated JS formatter for debugging JavaScript
  • Processes locally in the browser, keeping your TypeScript secure

How to use this TypeScript to JS converter

  1. Enter, paste, or load your TypeScript into the source editor
  2. Choose preferences for module system, JSX mode, and beautification to suit your needs
  3. Press Convert TypeScript button to compile TS to JS code
  4. Review the produced JS in the result panel, format for clarity or compress for use, then duplicate or save the output

Why convert TS to JS

Converting TypeScript to JavaScript guarantees seamless operation across browsers and ecosystems, eases incorporation into current projects, and facilitates smooth upgrades to newer standards while maintaining code integrity and performance.

Key differences: TypeScript source vs compiled JavaScript

  • TypeScript adds types and interfaces for safety, removed in compilation
  • JavaScript runs natively everywhere without type annotations
  • Transpilation strips types and downlevels features to plain JS
  • Output JS can aim at ES3 through ESNext based on settings
  • TypeScript boosts development with checks, JS offers runtime simplicity
  • Source maps link errors back to TypeScript for better troubleshooting

Example 1: Simple typed function

Siple TS Code

Copy
function greet(name: string): string {
  return `Hello, ${name}!`;
}
console.log(greet("World"));

Converted JS Code

Copy
function greet(name) {
    return "Hello, " + name + "!";
}
console.log(greet("World"));

Example 2: Class with constructor

TypeScript Code

Copy
class Person {
    name: string;
    age: number;

    constructor(name: string, age: number) {
        this.name = name;
        this.age = age;
    }

    greet(): string {
        return `Hello, my name is ${this.name} and I am ${this.age} years old.`;
    }
}

const user = new Person("Alice", 25);
console.log(user.greet());

Converted JS Code

Copy
var Person = (function() {
    function Person(name, age) {
        this.name = name;
        this.age = age;
    }
    Person.prototype.greet = function() {
        return "Hello, my name is ".concat(this.name, " and I am ").concat(this.age, " years old.");
    };
    return Person;
}());
var user = new Person("Alice", 25);
console.log(user.greet());

Customization options

Below are the settings you can adjust to get the exact JS output you want after transpilation.

OptionDefaultDescription
Remove CommentsTrueDo not emit comments to output.
Downlevel IterationFalseProvide full support for iterables in ES5/ES3.
Experimental DecoratorsFalseEnable support for experimental decorators.
Incremental CompilationFalseEnable incremental compilation.
Inline Source MapFalseInclude source maps inside output files.
JSX ModePreserveSpecify JSX code generation mode.
JSX FactoryReact.createElementSpecify the JSX factory function to use when targeting React JSX.
JSX Fragment FactoryReact.FragmentSpecify the JSX fragment factory function to use.
Module SystemCommonJSSpecify module code generation.
Module DetectionAutoControl whether a file is treated as a module.
Module ResolutionClassicDetermine how modules get resolved.
Preserve Const EnumsFalseDo not erase const enum declarations in generated code.
Strict ModeFalseEnable all strict type-checking options.
ECMAScript TargetES3Specify ECMAScript target version for output.
Indent Size4Number of spaces per indent level.
Indent CharSpaceCharacter used for indentation.
Use TabsFalseIndent using tabs instead of spaces.
EOLLFEnd-of-line character for output.
Ending NewlineFalseAdd newline at the end of output.
Keep NewlinesTruePreserve existing line breaks.
Indent Level0Initial indentation depth.
Max Newlines3Maximum line breaks to preserve.
Space in ()FalseAdd space inside parentheses.
Empty () SpaceFalseAdd space inside empty parentheses.
Anon Fn SpaceFalseSpace before () in anonymous functions.
Named Fn SpaceFalseSpace before () in named functions.
Brace StyleCollapseStyle of code block braces.
Break ChainsFalsePut each method call on a new line.
No Chain IndentFalseDo not indent chained methods.
Keep ArraysFalsePreserve original array formatting.
UnescapeFalseUnescape printable xNN strings.
Wrap Length0Wrap lines exceeding this length.
Comma FirstFalsePlace commas at line start.
Operator PosBefore NewlinePosition of operators in wrapped lines.
Indent Empty LinesFalseKeep indentation on empty lines.

Best Practices

  • Keep TypeScript files in version control
  • Enable source maps for easier debugging
  • Format for development, minify for production
  • Lint compiled JS before project integration

Conclusion

Utilize this TypeScript to ES6 JavaScript converter to compile your TS to JS efficiently and securely. Set ECMAScript target and module options for tailored results, and retrieve functional vanilla JS instantly.