Formatters & Validators - Free Online Tools
Code formatting tools that help you clean up, beautify, and validate your code. Whether you're debugging messy JSON from an API response, preparing SQL queries for documentation, or just trying to read minified JavaScript, these formatters make your code readable and properly structured.
All tools run entirely in your browser. Nothing gets sent to a server. Your code stays private, and formatting happens instantly without network delays.
Available Tools
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting. Instantly beautify messy JSON or compress it for production use. Includes clear error messages with line numbers for debugging.
JSON Validator
Validate JSON syntax with detailed error reporting. Includes strict mode, formatted output, and structure view for valid JSON.
JSON Diff
Compare two JSON objects and highlight differences. Side-by-side view with additions, deletions, and changes clearly marked.
JSON Schema Validator
Validate JSON data against JSON Schema. Check compliance, show detailed errors with line numbers, and ensure data structure correctness.
JSON to Schema Generator
Generate JSON Schema from JSON data. Automatically infer schema structure from your JSON with support for nested objects and arrays.
SQL Formatter
Format and beautify SQL queries with support for multiple dialects (MySQL, PostgreSQL, SQLite, MSSQL, MariaDB). Includes minification and customizable formatting options.
CSS Formatter/Minifier
Format or minify CSS code. Beautify with proper indentation or compress for production. Includes size reduction statistics.
JavaScript Formatter/Minifier
Format or minify JavaScript code. Beautify with proper indentation, quote style, and semicolon options. Includes size reduction statistics.
XML Formatter
Format and beautify XML documents. Includes minification and customizable formatting options.
HTML Minifier
Minify HTML by removing whitespace, comments, and optional elements. Preserves content in script, style, and pre tags.
Why Use Formatting Tools?
Formatting tools aren't just about making code look pretty. They help you catch errors, understand structure, and maintain consistency across projects.
When you're working with API responses, properly formatted JSON makes it immediately obvious if the structure is wrong or if required fields are missing. SQL formatters help you spot logic errors in complex queries. CSS formatters catch mismatched brackets and invalid properties.
These tools also help with collaboration. When everyone's code follows consistent formatting, code reviews become easier and merge conflicts happen less often. Plus, minifiers help optimize production code by removing unnecessary whitespace and comments.
Common Use Cases
- • Debugging API responses by formatting minified JSON
- • Cleaning up SQL queries before adding them to documentation
- • Validating JSON configuration files for errors
- • Converting JSON to TypeScript types for frontend development
- • Minifying CSS and HTML for production deployment
- • Previewing Markdown before committing to GitHub
- • Comparing JSON objects to spot differences in API responses
- • Generating JSON Schema for API documentation
- • Formatting code snippets before sharing on Stack Overflow
Related Categories: Converters | Text Tools | Developer Utilities