📝 Format Tools

Format and prettify JSON, HTML, CSS, SQL, and XML code with proper indentation. Choose a tool below to get started.

JSON Formatter Format, validate, and beautify JSON data online. Detect syntax errors, auto-indent, and minify JSON with our free tool. HTML Prettifier Format and beautify HTML code with proper indentation. Clean up messy HTML markup instantly with our free online tool. CSS Formatter Format and beautify CSS code online. Add proper indentation, organize properties, and minify stylesheets instantly. SQL Formatter Format and beautify SQL queries online. Add proper indentation, uppercase keywords, and improve readability of complex queries. XML Formatter Format and beautify XML data online. Add proper indentation, validate structure, and minify XML documents instantly.

About Code Formatting Tools

Well-formatted code is easier to read, review, and debug. When code arrives minified, auto-generated, or just poorly indented, a formatter instantly applies consistent structure without changing the logic. These tools support the five most common data and markup languages used in web development: JSON, HTML, CSS, SQL, and XML. All formatting runs in your browser — paste your code, click format, and copy the result.

Why Format Your Code?

Minified production code strips all whitespace to reduce file size, but working with it directly is nearly impossible. Formatted code reveals the structure at a glance: where objects begin and end, which conditions nest inside which blocks, and where a missing bracket might be hiding. Formatting also makes it easy to spot accidental duplication, misaligned closing tags, and deeply nested structures that should be refactored.

JSON Formatter

JSON (JavaScript Object Notation) is the dominant data exchange format for APIs and configuration files. The JSON Formatter validates syntax, adds proper indentation (2 or 4 spaces), and highlights errors. Pasting a minified API response into the formatter immediately reveals its structure. The formatter also catches common errors: trailing commas (invalid in JSON but allowed in JavaScript), single-quoted strings (JSON requires double quotes), and unescaped special characters.

HTML, CSS, and XML Formatters

HTML generated by CMS platforms, email builders, or legacy systems is often a single unreadable line. The HTML Prettifier adds indentation that reflects the DOM hierarchy, making it easy to understand nesting and spot mismatched tags. The CSS Formatter organizes properties with consistent indentation and spacing between rules. The XML Formatter handles complex XML documents with deep nesting, namespace prefixes, and mixed content, applying proper indentation to every element.

SQL Formatter

Complex SQL queries with multiple JOINs, subqueries, and CASE expressions are extremely hard to read without formatting. The SQL Formatter uppercases reserved keywords (SELECT, FROM, WHERE, JOIN), aligns clause keywords on the left margin, and indents subqueries. This makes it much easier to understand query logic, identify performance issues like cartesian joins, and review query plans.

Frequently Asked Questions

Does formatting change the behavior of my code?

No. Code formatters only change whitespace (spaces, tabs, newlines) and optionally keyword casing in SQL. They never modify the logic, values, or structure of your code. A formatted JSON object is semantically identical to its minified version.

Why does my JSON fail to format?

Common causes: trailing commas after the last item in an array or object (not valid in JSON), single quotes instead of double quotes for strings, unescaped backslashes, or comments (JSON does not support comments). The formatter will show an error message pointing to the problematic location.

Can I use these formatters on production code?

Yes, all formatting runs entirely in your browser. Your code is never sent to any server. The tools are safe to use with sensitive API responses, internal configuration files, and proprietary code.