Developer Utilities & Online Tools
Format JSON, decode JWTs, beautify SQL, test Regular Expressions, build Cron schedules, and generate cryptographic UUIDs instantly.
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Showing 10 of 10 in-browser developer tools with 100% client-side privacy
JSON Formatter & Validator
Beautify, validate, minify, and convert JSON to TypeScript interfaces, Go structs, and Python dataclasses instantly in your browser.
JWT Token Inspector & Decoder
Decode JSON Web Tokens (JWT), inspect header algorithms (RS256/HS256), verify payload claims (iss, sub, exp), and check token expiration status.
SQL Query Formatter & Beautifier
Format, indent, and beautify complex SQL queries for PostgreSQL, MySQL, SQLite, and Snowflake with custom indentation and keyword capitalization.
Regex Live Tester & Explainer
Test regular expressions in real-time with global flags (g, i, m, s), capture group inspection, and instant match highlighting.
Cron Expression Generator & Visualizer
Build standard 5-field cron expressions visually with human-readable schedule explanations and upcoming execution timetable forecasts.
Base64 & URL Encoder / Decoder
Encode and decode plain text or binary data to Base64, URL-encoded strings, SHA-256 cryptographic hashes, and MD5 digests.
UUID & Password Generator
Generate cryptographically secure UUIDv4 identifiers, high-entropy passwords, NanoIDs, and API secret keys using window.crypto CSPRNG.
CSS Flexbox & Grid Visual Generator
Visually adjust justify-content, align-items, grid-template-columns, gap, and flex-wrap with instant live preview and copyable CSS snippets.
Markdown Live Editor & HTML Converter
Write GitHub Flavored Markdown (GFM) with split live preview, code syntax highlighting, table formatting, and one-click HTML copy.
WCAG Color Contrast & Palette Checker
Calculate precise WCAG 2.1 AA and AAA contrast ratios between foreground text and background colors for accessible UI/UX design.
Senior Technical FAQ Hub: Developer Tools & Privacy
Comprehensive deep-dive questions covering internals, performance, memory models, security, and production gotchas (2 Total FAQs).