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TinySolve

JavaScript Formatter

Make minified or badly formatted JavaScript readable again.

Runs in your browser — nothing you type is sent anywhere

Indentation

Formatted

The result appears here as you type. Nothing is sent anywhere — the work happens in this page.

Modern syntax is understood, including JSX, async/await, optional chaining and class fields. The code is parsed, never executed — formatting something you do not trust is safe.

About the JavaScript Formatter

Minified JavaScript is deliberately unreadable — every unnecessary character removed, statements joined, and often variables renamed to single letters. Formatting it will not undo the renaming, but it restores the structure, which is usually enough to follow what a function does.

The formatter understands modern syntax: JSX, async and await, optional chaining, class fields, generators, template literals and the rest. Code that a formatter built for older JavaScript would refuse goes through without complaint.

The code is parsed, never executed. That matters if you are formatting something you do not trust — a script pulled off a page, or a file you were sent. Parsing turns it into a syntax tree and prints it back; nothing in it ever runs.

If the code will not parse, the error is shown with what the parser objected to. That doubles as a syntax check: a file that formats is a file that at least parses.

The parser is downloaded only when you press the button, and runs on your device. Nothing is uploaded, which matters because pasted code often includes API keys and endpoints that should not be handed to a third party.

How to use the JavaScript Formatter

  1. Paste your JavaScript

    Minified, badly formatted or just inconsistent. JSX and TypeScript-free modern syntax are both fine.

  2. Choose the indentation

    Two spaces, four spaces or tabs.

  3. Format it

    If it will not parse, the error says what the parser objected to — which doubles as a syntax check.

  4. Copy or download

    Take it to the clipboard or save it as a .js file.

Frequently asked questions

Will it restore my original variable names?
No. Minifiers rename variables to single letters and that information is gone — it is not recorded anywhere in the output. Formatting restores the structure, which is usually enough to follow the logic.
Is it safe to format code I do not trust?
Yes. The code is parsed into a syntax tree and printed back out. Nothing in it is ever executed, so a malicious script is just text.
Does it handle modern syntax?
Yes — JSX, async and await, optional chaining, nullish coalescing, class fields, generators and template literals. Older beautifiers often choke on these.
Does it work for TypeScript?
Plain JavaScript is what the parser is set up for. TypeScript's type annotations will be reported as a syntax error, since they are not JavaScript.
Is my code uploaded?
No. It is formatted in your browser. Pasted code often contains API keys and internal endpoints, so none of it is transmitted.

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