Free Online Developer Tools – JSON, CSS, HTML, JS & SQL
Format, validate, minify and convert code online: JSON formatter and validator, JSON to CSV/YAML/XML/TypeScript, HTML, CSS, JavaScript and SQL formatters and minifiers, regex tester and more.
JSON Formatter
Format and prettify JSON with validation.
JSON Validator
Validate JSON and show useful error messages.
JSON Minifier
Minify JSON to reduce whitespace.
JSON Diff
Compare two JSON documents.
JSON to CSV
Convert JSON arrays into CSV.
JSON to YAML
Convert simple JSON objects into YAML.
JSON to XML
Convert JSON objects into simple XML.
HTML Formatter
Format HTML with readable indentation.
CSS Formatter
Format CSS for readability.
JavaScript Formatter
Format basic JavaScript source.
HTML Minifier
Minify simple HTML.
CSS Minifier
Minify CSS by removing unnecessary whitespace.
JavaScript Minifier
Minify basic JavaScript source.
UUID Generator
Generate random UUID v4 identifiers.
Hash Generator
Generate SHA-256 hashes in your browser.
Regex Tester
Test regular expressions against sample text.
Fast utilities for everyday development work
Developer tools help you inspect and transform data quickly while you debug, document or ship code. Pretty-print a minified API response, find the exact line of a JSON syntax error, compare two JSON objects, generate TypeScript interfaces from sample data or minify CSS and JavaScript before deployment.
Everything runs client-side in your browser. Even so, avoid pasting secrets such as API keys, passwords or private tokens into any online tool.