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Format code in JavaScript, TypeScript, HTML, CSS, JSON, and more.
Instantly beautify code with a single click of the Format button.
View code with proper syntax highlighting for better readability.
Easily copy formatted code to clipboard with the Copy button.
Monitor current line and column position in the input editor.
Code formatting is the process of restructuring source code to improve its readability and maintainability without changing its functionality. It involves applying consistent rules for indentation, spacing, line breaks, and other stylistic elements. Proper formatting enhances code comprehension, reduces errors, and facilitates collaboration among developers. Many programming languages have established style guides, such as PEP 8 for Python or the Google JavaScript Style Guide, which provide standardized formatting conventions.
The Code Formatter uses the Prettier library to parse and reformat input code. Prettier creates an Abstract Syntax Tree (AST) from the input, then traverses this tree to generate consistently formatted output. It applies language-specific rules for elements like indentation, line wrapping, and spacing. The formatter also considers factors such as maximum line length and preferred quote style. While the exact algorithms vary by language, Prettier aims to produce deterministic output, meaning the same input will always result in the same formatted code.