Coffe2CodeDeveloper tools
Small, fast developer tools that run entirely in your browser. Format JSON, decode a JWT, test a regex or read a cron expression without pasting your data into someone else’s server.
Encode & decode
Format & convert
Generate
Test & debug
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Guides
- JWT Explained: Header, Payload and SignatureWhat is inside a JSON Web Token, and what decoding does and does not prove.
- Cron Syntax Explained, With ExamplesThe five fields, special characters and the schedules people get wrong.
- Regex Cheat Sheet for JavaScriptCharacter classes, quantifiers, groups, lookarounds and flags on one page.
- Unix Time ExplainedEpoch seconds vs milliseconds, time zones, leap seconds and the 2038 problem.
Your data stays on your machine
Most online formatters and decoders send what you paste to a server. That is a bad idea for an access token, a customer record or an API response from production. Every tool on Coffe2Code runs in JavaScript in your browser tab. Nothing you type is uploaded, logged or stored, and the tools keep working if you go offline after the page loads.
What is here
- Encode and decode: Base64, URL encoding and JWTs.
- Format and convert: JSON, naming cases and Unix timestamps.
- Generate: UUIDs and SHA hashes and HMACs.
- Test and debug: regular expressions and cron schedules.
Each page explains the format it works with, shows worked examples and lists the mistakes people make most often, so you can understand the result rather than just copy it.