JavaScript Formatter

Tidy JavaScript code for readability using Prettier rules.

Category: Dev Tools

When to use?

Use it to tidy a copied JavaScript snippet to a consistent style, or to expand minified JS for readability.

How to use

  • Paste the JavaScript code.
  • Press format to tidy by Prettier rules.
  • Copy the tidied code.

Input Explanation

Paste the JavaScript snippet or function block to align.

Calculation Basis

It calls the Prettier engine (standalone browser build) to parse the code into an AST and reconstruct whitespace, tabs, line breaks, and semicolons per the standard style guide.

Usage Examples

  • Tidy code snippets - Paste copied JavaScript to tidy to a consistent style.
  • Quick pre-deploy check - Check inputs and output to reduce errors before dev/ops work.
  • Aid docs/reviews - Copy the tidied result into dev docs, issues, or review comments.

Examples

  • A misindented function declaration → clean JS in Prettier standard style
  • Scrambled-indent function code → aligned to Prettier standard style

Cautions

  • Generated output is for reference; test carefully before production use.
  • Code tidying runs only in the browser and is not sent to a server.

Guides

JavaScript alignment

It indents JavaScript and consistently aligns braces and function placement. Choose a tab/space basis to match your Prettier/ESLint config.

Tidy before debugging

Use it to expand minified or obfuscated code to grasp the logic. The minify feature reduces code size before deploy.

FAQ

Does it support TypeScript?

The tool currently targets JavaScript syntax formatting.

Is the pasted code sent out?

No. Code tidying runs only in the browser and is not sent to a server.

Are semicolon and quote styles tidied?

Semicolon and quote styles are unified per Prettier default rules.

Is JSX tidied?

It runs on Prettier, so common JSX is tidied. Complex modern syntax may be handled differently.

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