Developer Tools
Utilities for JSON, URL, JWT, Base64, Regex, HTML, CSS, and technical formats.
20 tools available
JSON Formatter
Format, validate and beautify JSON
Hash Generator
Generate SHA-1, SHA-256, and SHA-512 hashes
URL Encoder / Decoder
Encode and decode URLs instantly
HTML Entity Encoder / Decoder
Encode and decode HTML entities
Timestamp Converter
Convert Unix timestamps to dates
Text Diff Checker
Compare two texts and find differences
JSON to CSV Converter
Convert JSON arrays to CSV
JSON Validator
Validate JSON syntax instantly
JSON Minifier
Minify JSON for production
URL Parser
Parse URL components instantly
JWT Decoder
Decode JWT tokens client-side
Regex Tester
Test regular expressions instantly
HTML Minifier
Minify HTML for production
CSS Minifier
Minify CSS for production
JavaScript Minifier
Minify JavaScript locally with Terser
CSS Gradient Generator
Generate CSS linear gradients
Contrast Checker
Check text contrast ratio for accessibility
CSS Box Shadow Generator
Generate CSS box-shadow code
Border Radius Generator
Generate CSS border-radius code
CSS Clamp Generator
Generate CSS clamp() for fluid typography
Developer FAQ
Are these tools really free to use?
Yes, all developer tools on Click & Build Labs are completely free to use with no signup or installation required.
Is my code sent to any server?
No. All processing happens entirely in your browser. Tool inputs are not uploaded by the processing code. See the Privacy Policy for hosting and external services.
What formats are supported?
The collection includes JSON, URL, Base64, JWT, HTML, CSS and JavaScript utilities. See each tool for its supported inputs.