Free Developer Tools Online — JSON formatter, regex tester, hash generator, JWT tools, and more for developers
JSON Formatter
Format, validate, and minify JSON instantly
DeveloperBase64 Encoder
Encode or decode Base64 strings
DeveloperURL Encoder
Encode or decode URLs instantly
DeveloperMarkdown Preview
Write Markdown with live preview
DeveloperJWT Token Generator
Generate JWT tokens with custom payload and secret
DeveloperJWT Decoder
Decode and inspect JWT tokens without verification
DeveloperJSON Validator
Validate JSON syntax with detailed error messages
DeveloperRegex Tester
Test regular expressions with live matching and highlighting
DeveloperHash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
DeveloperCron Expression Generator
Build and explain cron schedule expressions
DeveloperCSS Minifier
Minify CSS code to reduce file size
DeveloperHTML Encoder
Encode/decode HTML entities and special characters
DeveloperText Diff Checker
Compare two texts and highlight differences
DeveloperUnix Timestamp Converter
Convert between Unix timestamps and human dates
DeveloperUUID Generator
Generate random UUIDs (v4) instantly
DeveloperSQL Formatter
Format and beautify SQL queries
DeveloperJSON to CSV Converter
Convert JSON data to CSV format
DeveloperChmod Calculator
Calculate Linux file permissions
DeveloperXML Formatter
Format and beautify XML code
DeveloperYAML Formatter
Format and validate YAML code
DeveloperCSV to JSON Converter
Convert CSV data to JSON format
DeveloperHTML to Markdown
Convert HTML code to Markdown syntax
DeveloperJavaScript Minifier
Minify JavaScript code to reduce file size
DeveloperColor Code Converter
Convert between HEX, RGB, HSL, CMYK color formats
DeveloperUnix Permission Converter
Convert between octal and symbolic file permissions
DeveloperHTTP Status Code Reference
Complete list of HTTP status codes with explanations
DeveloperJSON Path Finder
Find paths to values in JSON data
DeveloperAPI Request Tester
Send GET/POST requests and see responses
DeveloperCode Beautifier
Beautify HTML, CSS, and JavaScript code
DeveloperCode Diff Viewer
Compare two code snippets with syntax highlighting
DeveloperDeveloper Tools
JSON formatter, regex tester, hash generator, JWT tools, and more for developers. All tools are free, work in your browser, and require no sign-up.