Developer Tools
JavaScript Formatter
Beautify and indent minified or messy JavaScript.
Free browser toolRuns in your browserNo sign-up
JavaScript formatting studio
Re-indent JavaScript without executing untrusted code
Beautify functions, blocks and expressions as text inside the browser. The source is never run and formatting is not a security review or runtime validation.
Waiting
status
0 B
input size
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output size
JavaScript source
0 charactersFormatted JavaScript
No output yetSource input is preserved until you explicitly replace it.
Private by design. Input is processed inside this browser tab and is not sent to ToolsOnDuty.
About the JavaScript Formatter
Minified or one-line JavaScript is hard to read and debug. Formatting restores indentation and line breaks.
Paste your JavaScript and this tool re-indents it into clean, readable code.
Everything runs in your browser, so your code is never uploaded.
Key features
- Beautify and indent JavaScript
- Restores readable structure
- Handles minified code
- Source is formatted as text and never executed
- Copy and explicit .js download
- Runs in your browser
How to use
- 1Paste or load JavaScript, or use the asynchronous sample.
- 2Run Format JavaScript.
- 3Review the output; formatting is not linting or security analysis.
- 4Copy or download the .js result.
Examples
Format compact JavaScript
Input:
function add(a,b){return a+b}Output:
Indented function body and return statementFormatting changes layout, not program behaviour.
Frequently asked questions
- Is this the same as a linter?
- No. It formats the layout of your code, but it does not check for bugs or style-rule violations the way a linter does.
- Can it format minified JavaScript?
- Yes. Paste minified or one-line JavaScript and it restores indentation and line breaks for readable code.
- Is my code uploaded anywhere?
- No. Formatting runs entirely in your browser, so your code never leaves your device.
Continue your workflow
Open a related tool to prepare your files or refine the finished result.