JavaScript Beautifier

Parse and format source with a pinned local Prettier browser bundle. Formatting does not execute code or validate runtime behavior.

Free to useNo sign-upRuns in your browser

Enter your details

Enter the inputs, then select Format code.

Your result

Enter your details

Result will appear here

How JavaScript Beautifier works

Parse and format source with a pinned local Prettier browser bundle.

Formatting does not execute code or validate runtime behavior. Comments are retained; embedded-language formatting is disabled. Invalid syntax is rejected.

Concept diagram for JavaScript Beautifier, showing source code input and the supported output. — Concept diagram; the three operation images are actual browser captures.

How to use JavaScript Beautifier

Start with your own input.

Enter source code

Replace the example with your source code.

Format code

JavaScript Beautifier: input and settings in the implemented browser tool — Actual local browser view. Open the image to read it at full size.

Set the options

Check the source against the supported syntax and limits below.

Format code

JavaScript Beautifier: tool result in the implemented browser tool — Actual local browser view. Open the image to read it at full size.

Run and check the output

Select Format code. Review formatted source code, then use Copy result or download the result file.

Format code

JavaScript Beautifier: review the details in the implemented browser tool — Actual local browser view. Open the image to read it at full size.

When to use JavaScript Beautifier

Read compact source code

To read compact source code, start with source code. Parse and format source with a pinned local Prettier browser bundle.

Format code

Developer input and configuration represented by document cards. — Prepare the input. Concept illustration.

Prepare a reviewable snippet

To prepare a reviewable snippet, start with source code. Formatting does not execute code or validate runtime behavior.

Format code

A developer example flowing from input to reviewed output. — Inspect an example. Concept illustration.

Format an example for documentation

To format an example for documentation, start with source code. Review formatted source code, then use Copy result or download the result file.

Format code

Developer output handed to the next stage of a workflow. — Use the result in your workflow. Concept illustration.

How to read the result

Check what the output means.

Formatted source code. Parse and format source with a pinned local Prettier browser bundle.

Formatting does not execute code or validate runtime behavior. Comments are retained; embedded-language formatting is disabled. Invalid syntax is rejected.

Format code Format code

A developer result reviewed alongside its source. — Review the returned output. Concept illustration.

Supported input and limits

Check the format before processing.

Formatting does not execute code or validate runtime behavior. Comments are retained; embedded-language formatting is disabled. Invalid syntax is rejected.

Inputs and results are handled in this browser.

Format code Format code

Input format and assumptions reviewed for a developer task. — Check format and assumptions. Concept illustration.

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Encode UTF-8 text into standard padded Base64 and decode Base64 back into Unicode text.

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Format code with your input

Review formatted source code, then use Copy result or download the result file.

Format code

JavaScript Beautifier: common questions

Answers about using JavaScript Beautifier and understanding its results.

What does this tool support?

Formatting does not execute code or validate runtime behavior. Comments are retained; embedded-language formatting is disabled. Invalid syntax is rejected.

Can I save the result?

Yes. Download the result file after processing. Text results also have Copy result. Processing uses local browser code; no account is required.