Python to JavaScript Converter
Translate a subset of Python (print, if/for/while, def, f-strings, lists) into JavaScript.
Supported: print, assignments, if/elif/else, for (range & iterables), while, def, return, f-strings, len/append, and comments. Classes, exceptions, and imports are emitted as comments — always review the result.
Examples
FizzBuzz from Python to JavaScript
for i in range(1, 16):
if i % 15 == 0:
print("FizzBuzz")
elif i % 3 == 0:
print("Fizz")
elif i % 5 == 0:
print("Buzz")
else:
print(i)for (let i = 1; i < 16; i++) {
if (i % 15 === 0) {
console.log("FizzBuzz");
} else if (i % 3 === 0) {
console.log("Fizz");
} else if (i % 5 === 0) {
console.log("Buzz");
} else {
console.log(i);
}
}range() becomes a C-style for loop, print becomes console.log, and Python's indentation becomes brace-delimited blocks.
About this tool
The Python to JavaScript Converter reads simple Python scripts and rewrites them as JavaScript, covering the constructs that make up most short scripts: print becomes console.log, def becomes function, indentation-based blocks become braces, for-in-range becomes a classic C-style for loop, and f-strings become template literals. It also maps True/False/None, and/or/not, len, and list.append to their JavaScript equivalents.
It targets a deliberate subset — classes, exceptions, and imports are not translated; they are emitted as comments with a warning, and you should always review the output for anything beyond basic scripts. The translator runs entirely in your browser, so your code never leaves your machine and there is no signup. Use it to port a quick algorithm, explain Python to a JavaScript developer, or bootstrap a translation that you then finish by hand.
How to use
Paste a Python script
Paste code built from the supported subset — print, if/elif/else, for and while, def, f-strings, and lists.
Read the translated JavaScript
Inspect the output as it appears: console.log calls, C-style for loops, template literals, and braced blocks.
Review and finish by hand
Handle skipped constructs (classes, exceptions, imports) left as comments and adjust the result to your codebase.
Use cases
Port a quick algorithm
Translate a short solution (sorting, FizzBuzz, math helpers) you found in Python into a runnable JavaScript equivalent fast.
Explain Python to a JS developer
Show one-to-one mappings — def → function, print → console.log, f-strings → template literals — side by side.
Bootstrap a migration
Start a larger port from translated output and finish the classes, exceptions, and imports by hand.
Common mistakes
Mistake:Feeding in classes, exceptions, or imports.
Fix:Those constructs are deliberately skipped and emitted as comments with warnings — keep them out of the input or plan to rewrite them by hand.
Mistake:Trusting the output without reviewing it.
Fix:Treat the result as a strong starting point; always read the translated code before shipping it, especially beyond basic control flow.
Mistake:Expecting exact Python semantics.
Fix:print's sep/end, list methods beyond append, and slicing are not part of the subset — verify that behavior matters to your script.
Frequently asked questions
Related guides
TypeScript to JavaScript: What Type Erasure Actually Removes
Exactly what a TS-to-JS converter strips — annotations, interfaces, generics, enums — what it preserves, and why a type eraser is not a compiler.
Python to JavaScript: Porting Code Without the Rewrite
Map Python's print, def, if/for/while, f-strings, and lists onto JavaScript equivalents, and know which constructs to finish by hand.
Java to Kotlin: A Practical Conversion Guide
How a simple Java class maps to idiomatic Kotlin — println, var/val, fun, and for-in — and where a hand-rolled converter needs a manual review.
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