Every tool you need to work with code, in one place
110 free developer utilities at your fingertips. Formats, crypto, HTTP, text, SQL, dummy data, images and more — 100% in the browser. Nothing is uploaded.
Start with these
All toolsJSON Formatter
Beautify, minify, sort, and validate JSON entirely in the browser.
JSON → TS
Infer TypeScript interfaces, type aliases, or Zod schemas from sample JSON.
JWT Debugger
Decode JWT header, payload, and signature in-browser with expiry countdown.
cURL → Code
Paste a cURL command and get fetch, Axios, Python requests, and Go http.
Regex Tester
Test JavaScript regular expressions with matches, groups, flags, and replace.
UUID Generator
Bulk-generate UUID v4, UUID v7, NanoID, and high-entropy API keys locally.
SQL Formatter
Pretty-print SQL for PostgreSQL, MySQL, SQLite, MariaDB, and T-SQL.
Base64 / URL
Encode and decode Base64, Base64URL, and URI components, including file data URIs.
Hash Generator
SHA-1, SHA-256, SHA-384, SHA-512, MD5, and HMAC from text or files in-browser.
Unix Timestamp
Convert epoch seconds and milliseconds to ISO time, local time, and time zones.
Guides
JWTs in practice: RFC 7519 without the hand-waving
How JSON Web Tokens are structured, which claims matter, why alg none is dangerous, and how to inspect tokens without leaking them to a hosted debugger.
9 min read
UUID v4 vs v7: randomness, indexes, and when to switch
A practical comparison of UUID v4 and UUID v7 for primary keys, sort order, privacy of timestamps, and database index locality.
7 min read
Typing JSON in TypeScript: samples, Zod, and trust boundaries
Why inferred interfaces from sample JSON are a starting point, not a contract, and how Zod (or another parser) belongs at every trust boundary.
8 min read
Why developer tools should run in your browser
The privacy, latency, and AdSense-era content problem of hosted utilities — and how a static, client-side suite avoids uploading secrets.
6 min read
Third-party APIs
IFSC, IP geolocation, dummy JSON REST, weather, FX, and more — with Free / Freemium / Paid labels and official-docs links.
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