Free Developer Tools Online
Format & minify JSON, XML, HTML, CSS, JS; parse URLs, decode JWTs, test RegEx, and convert CSVs. Most tools run in your browser; a few AI tools send the image to a third-party service.
JSON Formatter
Format and beautify JSON with customizable indentation.
JSON Validator
Validate JSON syntax and pinpoint syntax error line numbers.
JSON Minifier
Minify JSON by stripping all whitespace and line breaks.
XML Formatter
Format and beautify XML with clean tag indentation.
XML Validator
Check XML well-formedness and detect unclosed tags.
CSV → JSON
Convert CSV spreadsheets into structured JSON arrays.
JSON → CSV
Convert JSON object arrays into downloadable CSV files.
HTML Formatter
Format and indent messy HTML code with proper tag nesting.
HTML Minifier
Minify HTML by removing comments, redundant spaces, and line breaks.
CSS Formatter
Format and beautify CSS stylesheet rules with clean indentation.
CSS Minifier
Minify CSS files by stripping comments and unnecessary spacing.
JavaScript Formatter
Format and beautify JavaScript / TypeScript code.
JavaScript Minifier
Minify JS code by removing comments and whitespace.
Regex Tester
Test and debug Regular Expressions with real-time match highlighting.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) header and payload.
URL Parser
Parse URLs into protocol, hostname, port, path, and query parameters table.
HTML Encoder
Convert special characters to HTML entities (&, <, >).
HTML Decoder
Convert HTML entities back into plain characters (< to <).
Color Converter
Convert colors between HEX, RGB, HSL, and CMYK formats.
Timestamp Converter
Convert Unix epoch timestamps to human dates and vice-versa.