Developer Tools

Developer Tools brings together the small, everyday utilities that software developers reach for dozens of times a week — not a full IDE replacement, but 23 focused tools that each solve one specific, recurring annoyance: pretty-printing a minified API response, checking whether a regex actually matches what you think it matches, generating a UUID for a new database row, decoding a JWT to see what claims it carries, or turning a cron expression into plain English before you accidentally schedule a job to run every minute instead of every hour. Every tool here runs entirely in your browser. There is no server round-trip between pasting code or data and seeing the result, which matters for two reasons: it's instant (no network latency, no loading spinner for a formatting operation that should take milliseconds), and it's private. Developers routinely paste real API keys, database connection strings, JWTs from production sessions, and internal configuration into tools like these — and none of that content is ever transmitted, logged, or stored anywhere. Everything from JSON formatting to SSH key generation happens with JavaScript running locally on your device. The tools fall into a few natural groups. Formatters and minifiers (JSON, YAML, XML, HTML, CSS, JS, SQL) take messy or minified code and either make it readable or make it small, depending on what you need at that moment — writing/debugging wants readable, shipping to production wants small. IDs and security tools (UUID, ULID, hash generator, JWT decoder, regex tester, credit card generator) cover the small cryptographic and identifier tasks that come up constantly during development and testing — generating a unique key, checking a SHA-256 checksum, or decoding a token to debug an auth issue (decoding only — this category does not verify signatures, since that requires a secret only your server has). Converters (timestamp, Markdown to HTML, JSON to CSV and back, JSON to TypeScript, cron expression builder) reshape data from one format developers work with into another. And a handful of more specialised tools — an SSH key pair generator using your browser's native Web Crypto API, a code-to-image exporter for sharing a snippet as a picture, a fake data generator for seeding a test database, and an aspect ratio calculator for image and video dimensions — round out the set. Each tool page includes a plain-English explanation of what it does, common pitfalls, and worked examples, so it doubles as a quick reference even if you already know roughly what the tool does. If you're not sure which tool covers what you need, the search bar at the top of every page searches across all tool titles, descriptions and FAQs at once.