JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting.
Use Tool →Developer
Essential utilities for developers following IETF and W3C standards. Encode and decode Base64 per RFC 4648, format JSON to ECMA-404, or generate cryptographic hashes—all processed locally with no data transmitted to any server.
These tools serve a broad range of developers. Front-end engineers use the JSON formatter to debug API payloads and inspect nested structures. Back-end developers encode and decode API tokens with the Base64 tool per RFC 4648. Designers rely on the color contrast checker to verify WCAG 2.1 accessibility compliance. DevOps teams generate universally unique identifiers with our UUID generator following RFC 4122, ensuring collision-free IDs across distributed systems.
For security-related tasks, the password generator uses crypto.getRandomValues() from the Web Cryptography API (W3C) to produce cryptographically strong random values. The hash generator supports SHA-256 and SHA-512 as specified in FIPS 180-4 by NIST, alongside legacy algorithms like MD5 for checksum verification. The regex tester helps validate input patterns with real-time matching and group highlighting. All tools handle Unicode text and UTF-8 encoded input correctly.
Velvet MD - Markdown Beautifier
Transform markdown into beautifully styled documents with live preview and export to HTML, PDF, or DOCX.
Use Tool →Base64 Encoder/Decoder
Encode text or files to Base64, decode Base64 to text or files.
Use Tool →URL Encoder/Decoder
Encode special characters for URLs or decode percent-encoded strings.
Use Tool →Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.
Use Tool →Regex Tester
Test regular expressions with live highlighting and match details.
Use Tool →Code Minifier
Minify JavaScript, CSS, and HTML to reduce file size.
Use Tool →Password Generator
Generate strong, random passwords with customizable options.
Use Tool →Random Number Generator
Generate random numbers, integers, or sequences within a custom range with no duplicates option.
Use Tool →JSON to CSV
Paste or upload JSON and instantly convert to CSV with automatic column flattening.
Use Tool →CSV to JSON
Paste or upload CSV and instantly convert to JSON with nested object support.
Use Tool →UUID Generator
Generate UUIDs (v4, v7, v1), ULIDs, and NanoIDs instantly.
Use Tool →Slug Generator
Convert text to URL-friendly slugs for SEO-optimized links and file names.
Use Tool →Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats instantly.
Use Tool →XML Formatter
Format, validate, and beautify XML with syntax highlighting.
Use Tool →YAML Formatter
Format, validate YAML, and convert between YAML and JSON.
Use Tool →Data Unit Converter
Convert between bytes, KB, MB, GB, TB, and PB with binary or decimal base.
Use Tool →Color Palette Generator
Generate beautiful color palettes with harmonies, Material Design tones, and export options.
Use Tool →Color Contrast Checker
Check and calculate WCAG contrast ratios between text and background colours for accessibility compliance.
Use Tool →Frequently Asked Questions
What standards do the developer tools follow?
Our tools follow established web standards. The JSON formatter implements ECMA-404, Base64 encoding follows RFC 4648 (IETF), and URL encoding complies with RFC 3986. Hash generators support standard algorithms including SHA-256 and MD5.
Is my code sent to a server for processing?
No. All developer tools process data entirely in your browser using JavaScript. Your code, JSON, Base64 strings, and other inputs are never transmitted to any server. This makes the tools safe to use with proprietary or sensitive code.
What is the difference between Base64 encoding and encryption?
Base64 is an encoding scheme (defined in RFC 4648) that converts binary data to ASCII text for safe transport. It is not encryption—anyone can decode Base64 without a key. Encryption algorithms like AES use a secret key to make data unreadable without authorization.
Which hash algorithm should I use?
It depends on your use case. MD5 is a legacy algorithm that is fast and widely supported, but NIST has determined it is cryptographically broken — do not use it for security purposes such as password hashing or digital signatures. SHA-256, defined in FIPS 180-4, is a general-purpose choice suitable for data integrity verification, certificate signing, and most modern applications. SHA-512, also part of FIPS 180-4, offers a larger output and higher security margin, making it preferable for environments where long-term resistance to brute-force attacks is required.
What is UUID and when should I use one?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized in RFC 4122. Our generator creates version 4 UUIDs, which use 122 bits of cryptographically secure randomness, yielding over 5.3 × 10³⁶ possible values — making collision probability negligible for all practical purposes. Use UUIDs as database primary keys when you need IDs that can be generated independently without coordination, as session tokens in web applications, or as identifiers in distributed systems where multiple nodes create records simultaneously.