Developer Tools

Local-first utilities for developers. No account needed.

Format JSON, encode Base64, decode JWTs, test regex patterns, and more — all client-side. No data leaves your browser.

6 tools live

JSON Formatter

Format, validate, and minify JSON.

Base64 Encoder/Decoder

Encode and decode Base64 strings.

JSON to CSV

Flatten JSON arrays into spreadsheets.

Diff Checker

Visual diff for text and code.

JWT Decoder

Decode and inspect JWT tokens.

Regex Tester

Test regex patterns with live matches.

Frequently asked questions