Free Developer Tools
54+ tools for JSON, text, HTML, code, and more. All browser-based — your data never leaves your device.
📊 JSON / Data
JSON Formatter
Format and pretty-print JSON with customizable indentation.
JSON Validator
Validate JSON syntax and get detailed error messages.
JSON Minifier
Remove whitespace from JSON to reduce file size.
JSON Compressor
Advanced JSON compression for maximum size reduction.
JSON Diff
Compare two JSON objects and highlight the differences.
JSON Sort Keys
Sort JSON object keys alphabetically.
JSON Path Extractor
Extract values from JSON using JSONPath expressions.
JSON Schema Validator
Validate JSON data against a JSON Schema.
JSON to CSV
Convert JSON arrays to CSV format.
JSON to XML
Convert JSON data to XML format.
JSON to YAML
Convert JSON data to YAML format.
JSON Views
View JSON in multiple formats: tree, table, and raw.
📝 Text / Strings
Case Converter
Convert text between uppercase, lowercase, title case, and more.
Word Counter
Count words, characters, sentences, and paragraphs.
Text Diff
Compare two text blocks and highlight differences.
Line Sorter
Sort lines of text alphabetically or in reverse.
Remove Duplicates
Remove duplicate lines from text.
Whitespace Cleaner
Remove extra spaces, tabs, and blank lines from text.
Reverse Text
Reverse characters or words in text.
🌐 HTML
HTML Formatter
Format and indent HTML code for readability.
HTML Minifier
Minify HTML by removing whitespace and comments.
HTML Validator
Validate HTML markup for errors and warnings.
HTML to Text
Strip HTML tags and extract plain text content.
Link Extractor
Extract all links and URLs from HTML content.
HTML Live Preview
Write HTML and see a live rendered preview instantly.
💻 Code
🔄 Converters
Base64
Encode and decode Base64 strings.
URL Encoder
Encode and decode URL / percent-encoded strings.
Unicode Escape
Escape and unescape Unicode characters.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Query Params
Parse and build URL query parameter strings.
Escape / Unescape
Escape and unescape HTML entities and special characters.
Text to Slug
Convert text to a URL-friendly slug.
🔐 Tokens / Security
JWT Decoder
Decode and inspect JWT token payload and header.
JWT Header Viewer
Inspect the header section of a JWT token.
JWT Expiry Checker
Check if a JWT token is expired or still valid.
Hash Generator
Generate MD5, SHA-1, SHA-256, and other hashes.
HMAC Generator
Generate HMAC signatures using a secret key.
Password Strength
Check the strength and security of a password.