About ShadowReference

The developer reference desk for everyday problems.

ShadowReference is a collection of 33 practical browser-based utilities for developers. Format JSON, decode JWTs, encode Base64, test regex, generate UUIDs, and more — every tool runs entirely in your browser. No backend, no database, no login required.

Our Principles

• Your data stays on your device. Tool inputs are never sent to a server.
• When ads are shown they are labeled, sit away from tool controls, and do not receive what you paste.
• Fast loading with minimal dependencies and route-based code splitting.
• Clear error messages and accessible, keyboard-friendly interfaces.
• Each tool is a useful, indexable page with examples and documentation.

Tools

• JSON Formatter — Beautify JSON with instant validation.
• JSON Validator — Check JSON syntax instantly.
• JSON Minifier — Compact JSON for production payloads.
• JSON to TypeScript — Generate TypeScript types from JSON.
• JSON to CSV — Turn JSON arrays into spreadsheet-ready CSV.
• JSON ↔ YAML — Switch between JSON and YAML formats.
• JWT Decoder — Inspect JWT tokens without verification.
• Base64 Encoder / Decoder — Encode or decode Base64 text.
• URL Encoder / Decoder — Encode and decode URL strings.
• HTML Entity Encoder / Decoder — Escape and unescape HTML entities.
• URL Parser — Break down any URL into its parts.
• UUID Generator — Generate random UUID v4 identifiers.
• Regex Tester — Test regex patterns with live matches.
• Regex Escape / Unescape — Make text safe for regex patterns.
• Timestamp Converter — Convert Unix timestamps to dates.
• Date & Time Converter — Convert dates across common formats.
• HTTP Status Code Reference — Quick reference for HTTP status codes.
• Color Converter — Convert colors across formats.
• CSS Formatter / Minifier — Format or minify CSS.
• HTML Formatter / Minifier — Format or minify HTML markup.
• JavaScript Formatter / Minifier — Format or minify JavaScript (lightweight).
• SQL Formatter — Make SQL readable.
• Markdown Previewer — Write Markdown and preview rendered HTML.
• Markdown File Reader — Read and preview Markdown files in your browser.
• Code Compare — Diff two code blocks instantly.
• CSV ↔ JSON — Convert between CSV and JSON.
• YAML Validator — Validate and format YAML.
• XML Formatter / Validator — Format and validate XML.
• Hash Generator — One-way cryptographic hashes in the browser.
• HMAC Generator — Generate HMAC signatures locally.
• cURL to Fetch — Turn cURL into fetch() code.
• cURL to Axios — Turn cURL into Axios code.
• QR Code Generator — Create QR codes locally.

For Developers

Tool logic lives in testable src/lib/tools/ modules, separate from UI components. The tool registry in src/data/tools.ts drives routing, metadata, and related-tool links.