About Dev Tools

Dev Tools is a free, open-access collection of 17 developer utilities built for speed and privacy. Every tool runs entirely in your browser — no data is ever sent to our servers, logged, or stored.

Our Philosophy

• Local-first: All computation happens on your device using browser APIs.
• No login required: Open a tool, use it, done.
• No tracking of inputs: Your code, tokens, and data stay on your machine.
• Fast: Static pages with no server round-trips.

Available Tools

• JSON Formatter — Format, beautify, validate, and minify JSON data instantly.
• JSON to CSV — Convert JSON arrays to CSV with custom delimiters.
• JSON to TypeScript — Generate TypeScript interfaces from JSON data.
• CSV to JSON — Convert CSV files and data to JSON format.
• Base64 Encoder — Encode and decode text to/from Base64 format.
• URL Encoder — Encode and decode URL components and full URIs.
• HTML to Markdown — Convert HTML markup to clean Markdown syntax.
• Hash Generator — Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes.
• JWT Decoder — Decode and inspect JWT tokens — header, payload, expiry.
• UUID Generator — Generate cryptographically secure UUIDs (v4).
• Regex Tester — Test regular expressions with live highlighting and match info.
• Diff Checker — Compare two texts and highlight differences line by line.
• SQL Formatter — Beautify and format SQL queries for readability.
• YAML to JSON — Convert YAML configuration files to JSON format.
• XML Formatter — Format, beautify, and validate XML documents.
• Timestamp Converter — Convert Unix timestamps to human-readable dates and back.
• Cron Parser — Parse and explain cron expressions in plain English.

Quality Policy

Each tool is tested against common edge cases. We prioritize correctness over feature bloat. If you find a bug, please contact us so we can fix it promptly.