JavaScript ↔ Python Transpiler

A transpiler converts source code from one programming language to another while preserving the same logic. Unlike a traditional compiler that generates machine code, a transpiler produces source code in another high-level language. This tool converts JavaScript to Python and vice versa, helping developers learn new syntax, migrate quick snippets, compare structures between languages, and understand key differences like dynamic typing, boolean handling, and function syntax.

Select the conversion direction using the "JS → Py" or "Py → JS" toggle at the top. Paste your source code in the left panel and click "Convert". The result appears instantly in the right panel. Example: JS → Py: JS: const x = 5; console.log(x); Py: x = 5 print(x) Py → JS: Py: def suma(a, b): return a + b JS: function suma(a, b) { return a + b }

JS → Py conversion handles: variables (var, let, const become direct assignment), console.log to print(), function to def, logical operators (&& to and, || to or, ! to not), conditionals else if to elif, try/catch/finally, native types (true/True, false/False, null/None, undefined/None), comments // to # and simple for loops. Does NOT support arrow functions, promises, async/await, ES6 classes, destructuring, spread operator, closures, prototypes, or modules.

Py → JS conversion handles: print() to console.log(), def functions to function, logical operators (and to &&, or to ||, not to !), conditionals elif to else if, try/except/finally, native types (True/true, False/false, None/null), comments # to // and loops. Does NOT support decorators, generators, context managers (with), list comprehensions, lambdas, async/await, typing, complex f-strings, specific exception handling, or slicing.

It uses regex-based rules, not a full AST parser. Limitations: no arrow functions (() => {}), ES6 classes, promises/async/await, Python decorators, comprehensions, generators, complex f-strings, destructuring, spread operator, closures, ES6 modules or imports. For advanced conversions, use Jiphy, pyjs or Transcrypt. This tool is ideal for educational snippets and syntax learning.

JavaScript uses camelCase by convention, curly braces {} for blocks, and optional semicolons. Python uses snake_case, mandatory indentation, and colons. JS has true/false/null/undefined as distinct values, Python only True/False/None. JS uses console.log() for debugging, Python print(). Functions in JS use function keyword, Python uses def. JS has var/let/const for variable scoping, Python uses direct assignment with function-level scoping by default. Logical operators differ: JS uses &&/||/!, Python uses and/or/not.