Developer Utilities
Code minifiers, beautifiers, JSON/SQL validators, regex playgrounds, JWT debuggers, diff checkers, and hash calculators.
JSON Validator & Formatter
Beautify, validate, parse, and repair JSON data with interactive syntax tree view, error highlighting, and one-click minification.
HTML Minifier
Minify HTML markup by stripping unnecessary whitespace, comments, and redundant attributes to accelerate webpage load times.
HTML Beautifier
Format and indent unorganized HTML code with custom tab spacing, tag alignment, and clean structure for improved readability.
CSS Minifier
Compress and minify CSS files by removing comments, whitespace, and redundant semicolons for production web assets.
CSS Beautifier
Reformat minified or unreadable CSS stylesheets with clean indentations, brace styles, and structured selectors.
JavaScript Minifier
Minify JavaScript source code safely in your browser. Remove whitespace and comments to reduce bundle sizes and improve execution speed.
JavaScript Beautifier
Format and unminify compact JavaScript and TypeScript code with customizable indentations and bracket positioning.
SQL Query Formatter
Format complex SQL queries with uppercase keywords, indentation, and clean clause structures for PostgreSQL, MySQL, SQLite, Oracle, and MariaDB.
Regex Engine Playground
Test, evaluate, and debug regular expressions in real time with match group highlighting, regex cheatsheet, and multi-language flag support.
File Diff Checker
Compare two text snippets or code files side-by-side with color-coded diff highlighting for additions, deletions, and inline modifications.
XML to JSON Converter
Convert XML data into structured, valid JSON objects with attribute parsing, array handling, and formatted output view.
JSON to XML Converter
Convert JSON arrays and nested objects into compliant, structured XML documents with root element naming and indentation.
URL Encoder & Decoder
Encode special characters into percent-encoded URL formats (RFC 3986) or decode query parameters and URI components back to readable text.
MD5/SHA-256 Hash Tool
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic checksum hashes from text or files using native Web Crypto APIs.
JWT Parser & Debugger
Decode and inspect JSON Web Token (JWT) headers, payloads, claims, and expiry dates locally in your browser with zero server transmission.
Markdown Previewer
Write and preview GitHub-flavored Markdown in real time with side-by-side HTML preview, table formatting, task lists, and export.
Cron Expression Generator
Build, validate, and translate 5-part crontab schedule expressions into plain English with interactive minute, hour, day, and month selectors.
UUID Generator Suite
Generate cryptographically secure v4 UUIDs/GUIDs in bulk with uppercase, lowercase, hyphens, and custom prefix options.
User Agent Analyzer
Parse and inspect User-Agent HTTP strings to detect browser family, engine version, operating system, device architecture, and bot identification.
HTACCESS Script Builder
Generate secure Apache .htaccess configuration snippets: 301 redirects, HTTPS enforcement, www/non-www rewrites, and custom error pages.
XML Sitemap Generator
Generate search-engine-compliant XML sitemaps with custom URL priorities, change frequencies, and last modified dates for SEO indexing.
Base64 Encoder/Decoder
Encode text strings and binary bytes into Base64 format or decode Base64 data back to plain UTF-8 text with instant copy-to-clipboard.
Why Use CrazyTools4U Developer Utilities?
Traditional online converters and utilities require you to upload your files to remote servers. This introduces bandwidth lag, security liabilities, and privacy exposure for sensitive files.
All utilities in the Developer Utilities suite on CrazyTools4U run entirely on the client side using WebAssembly (WASM), HTML5 Canvas pipelines, and Web Workers. Your raw files never leave your device memory, ensuring complete zero-server privacy and lightning-fast execution.