Untangle a JavaScript script

Developers use JavaScript Formatter before a code review, debugging session or handoff to another contributor.

Untangle a JavaScript script, so reviews, edits and debugging become easier. Use it for free in your browser, with no account required.

How to use

Paste your JavaScript into the input area, or import the file straight from your computer.
Run the formatting step and the tool rewrites line breaks and indentation so the structure of the code becomes visible at a glance.
Compare the result with your original to spot nested blocks, functions and objects that are badly closed.
Copy the tidied version back into your editor or pass it to a colleague for review.
Clear the panel before loading another file so two scripts do not get mixed up.

Example

A common case: a script delivered by an external contractor arrives as one enormous line. Once formatted, you immediately see where functions and conditions begin, which makes reviewing the file and hunting for a missing brace far quicker.

Limits and formats

Formatting changes presentation rather than behaviour: it fixes no logic error and no syntax mistake in your code.
Code written in a closely related language may deserve extra checking after it has been through the tool.
Compare the output with the original before replacing anything, especially when strings contain meaningful spaces.
For a project spread across many files, handle them one at a time and keep a backup of each one.

Where processing happens

Formatting takes place entirely inside your browser on the code you paste or import. No snippet is sent anywhere and nothing is retained after you close the page, so internal code can be cleaned up without leaving your machine.

Frequently asked questions

Can formatting break my script?

It should not change how the code behaves, since it only rewrites the layout. Still keep a copy of the original and compare the two versions before you overwrite your working file.

Which file types can I import?

The picker accepts .js, .mjs, .cjs, .ts, .tsx, .html, .css, .json, .sql and .graphql files as well as plain text. Only one file is loaded at a time.

Does the tool fix syntax errors?

No, it simply makes the code readable. A missing brace or an extra comma stays exactly where it was; reading the formatted version is what helps you spot it faster.