Developer Tools — Free, Private, In-Browser

JSON Formatter

Beautify, minify, validate JSON

Base64 Encode/Decode

Encode or decode Base64 strings

Hash Generator

MD5, SHA-1, SHA-256, SHA-512 hashes

JWT Decoder

Decode JWT tokens and inspect claims

URL Encode/Decode

Encode or decode URL components

UUID Generator

Generate v4 UUIDs in bulk

Cron Expression Builder

Visual cron builder with next 5 runs

API Tester

Mini Postman — test any API endpoint

Code Playground

Live HTML/CSS/JS editor with preview

Code Beautifier

Format JS/Python/SQL/HTML/CSS

Random Data Generator

Generate fake names, emails, phones, IPs

JSON to TypeScript

Generate TS interfaces from JSON

HTML/CSS/JS Minifier

Minify code & see size savings

CSS X-Ray

Audit any CSS — find specificity wars, dead rules, duplicates, color palette, font usage, z-index map

Butterfly Effect

Change one symbol → see every file that breaks. Static analysis of ripple effects.