Developer Tools
Format, minify, validate, encode, and convert your code. JSON, HTML, CSS, JavaScript, XML, YAML, CSV, and more — all processed locally in your browser.
Featured Developer Tools
The most popular tools developers use every day.
JSON Formatter & Validator
Pretty-print, validate, and minify JSON data. Highlights syntax errors with line numbers.
HTML Minifier
Minify HTML code to reduce file size. Strip comments, whitespace, and optional tags.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and signature contents.
Base64 Encoder/Decoder
Encode text to Base64 and decode Base64 strings back to plain text.
Regex Tester
Test regular expressions with live highlighting and match details.
All Developer Tools
Browse our complete collection of 29 browser-based developer utilities.
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax error highlighting.
JSON Compare
Compare two JSON objects and highlight structural and value differences.
JSON Escape/Unescape
Escape special characters in JSON strings or unescape them back to readable text.
JSON to YAML
Convert JSON data to clean, human-readable YAML format instantly.
YAML to JSON
Convert YAML configuration files to valid JSON format.
JSON to CSV
Convert JSON arrays and objects to CSV spreadsheet format.
CSV to JSON
Parse CSV data and convert it to structured JSON format.
XML Formatter
Format and validate XML documents with proper indentation.
XML to JSON
Convert XML documents to JSON format with structure preservation.
HTML Minifier
Minify HTML code by removing whitespace, comments, and optional tags.
HTML Beautifier
Beautify and format minified HTML with proper indentation and line breaks.
HTML Validator
Validate HTML markup and find syntax errors with detailed reports.
HTML Encoder/Decoder
Encode special characters to HTML entities or decode them back.
CSS Minifier
Minify CSS code to reduce file size for faster page loads.
CSS Beautifier
Beautify and format minified CSS with consistent indentation.
JavaScript Minifier
Minify JavaScript code for production-ready deployments.
JavaScript Beautifier
Beautify and format minified JavaScript with readable indentation.
Base64 Encoder/Decoder
Encode and decode Base64 strings for data transfer and storage.
URL Encoder/Decoder
Encode special characters in URLs or decode URL-encoded strings.
URL Parser
Parse URLs into protocol, hostname, port, path, and query components.
Query String Parser
Parse URL query strings into key-value pairs for debugging and analysis.
Regex Tester
Test regular expressions with live matching and capture group details.
JWT Decoder
Decode JWT tokens to view header, payload, and signature.
JWT Generator
Generate JWT tokens with custom headers, payloads, and secrets.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
Hash Checker
Verify file or text integrity by comparing against known hash values.
UUID Validator
Validate UUID strings and check their version and format.
HTTP Status Lookup
Look up HTTP status codes with descriptions and common use cases.
MIME Type Lookup
Look up MIME types by file extension or search by type category.
Related Categories
Explore more browser-based tool collections.
PDF Tools
Merge, split, compress, convert, and edit PDF documents.
Image Tools
Compress, resize, crop, convert, and edit images.
Text Tools
Count words, convert case, generate keywords, and clean text.
Utility Tools
QR codes, password generators, UUIDs, color pickers, and more.
Frequently Asked Questions
Are these developer tools really free?
Yes. All 29 developer tools are completely free with no sign-up required. Every tool runs directly in your browser with no hidden costs or usage limits.
Is my code or data sent to a server?
No. All processing happens locally in your browser using JavaScript. Your code, JSON, HTML, and any other data never leaves your device. Nothing is uploaded, stored, or logged on any server.
Can I use these tools offline?
Most tools work offline once the page has loaded, as they rely entirely on client-side JavaScript. You may need an initial connection to load the page assets, but after that the tools function without internet access.
What formats can I convert between?
Our tools support conversions between JSON, YAML, CSV, and XML. You can also beautify, minify, validate, encode, and decode HTML, CSS, and JavaScript code.
How does the JSON Formatter work?
Paste your JSON string and the tool validates the syntax, then pretty-prints it with proper indentation. You can also minify JSON to reduce its size. Syntax errors are highlighted with line numbers for easy debugging.
Can I use the Hash Generator to verify file integrity?
Yes. The Hash Generator produces MD5, SHA-1, SHA-256, and SHA-512 hashes for any text input. You can then use the Hash Checker to compare a known hash against your computed hash to verify data integrity.
How these tools work: All processing happens in your browser. Your code and data are never uploaded to any server. Nothing is logged or stored.