Developer Tools

Small tools for everyday coding

10 utilities for the jobs that come up constantly while writing code — checking JSON, decoding a token, converting a timestamp, testing a pattern. Every one runs entirely in your browser: there is no server behind them, so nothing you paste is uploaded or stored.

Data & formats

JSON Formatter & ValidatorPretty-print, minify and check JSON, with the position of any syntax error.
UUID GeneratorGenerate random version 4 UUIDs, one at a time or in bulk.
Unix Timestamp ConverterTurn a Unix timestamp into a readable date, or a date into a timestamp.

Encoding

Tokens & hashing

Text

Why these run in your browser

Developer data is often sensitive — an API response with customer details, a token that grants access to an account. A tool that uploads it to a server asks you to trust that server. These tools use only what your browser already provides (its JSON parser, its encoders, its Web Crypto API), so there is nothing to trust beyond the page itself, and the privacy policy still holds: nothing is collected.