Online JavaScript Formatter and Minifier

Online JavaScript Formatter, Minifier and Syntax Checker

The online JavaScript formatter organizes, minifies and validates JavaScript code. It supports common ES6+ syntax, making compressed scripts easier to read and allowing code to be minified before release.

JavaScript Formatting

Automatically formats indentation, line breaks, braces, functions and conditional structures. Supports 2, 4 and 8 spaces or Tab indentation for consistent basic code formatting.

Modern JavaScript Syntax

Supports common modern JavaScript structures including arrow functions, classes, async/await, template literals and import/export syntax from ES6 and later versions.

JavaScript Minification

The minification function uses Terser to parse and optimize JavaScript, reducing unnecessary whitespace and other removable content. Comments can be handled according to the selected settings.

JavaScript Syntax Validation

The tool uses a JavaScript parser to detect syntax that cannot be parsed correctly, including common problems with brackets, strings and statement structures. Syntax validation does not test runtime behavior or business logic.

Error Location and Result Handling

When a syntax error occurs, the tool displays the error information and code location so the problem can be found quickly. Results can be copied, downloaded as a JS file or returned to the input area for further processing.

Common Uses

• Format compressed JavaScript for easier reading and analysis.
• Organize JavaScript source code in frontend projects.
• Minify JavaScript before publishing scripts.
• Check JavaScript syntax during development and debugging.
• Process JavaScript repeatedly with formatting, minification and validation.

Privacy and Data Security

JavaScript processing is performed entirely in the browser. Source code is not uploaded to the server, making it suitable for project scripts, configuration snippets and other code.