Developer Utilities Directory
High-performance developer utilities running 100% in your local browser sandbox. Zero server uploads, zero external telemetry, instant execution.
JSON Formatter & Validator
Format, validate, minify JSON and generate TypeScript interfaces with instant feedback.
JWT Decoder
Inspect JSON Web Token headers, payloads, and check expiration without sending keys to any server.
UUID Generator
Generate RFC 4122 v4 (random) and v1 (timestamp-based) UUIDs in bulk with copy options.
Base64 Encoder / Decoder
Encode and decode text, UTF-8 strings, and files to Base64 and URL-safe Base64.
URL Encoder / Decoder
Encode and decode URL components and inspect query parameters in an organized table.
Regex Tester
Test regular expressions interactively with live highlight, flags, and capture group analysis.
Unix Timestamp Converter
Convert Unix epoch timestamps to human dates, ISO-8601, local time, and relative duration.
Cron Schedule Builder
Build and parse 5-field cron schedules with human-friendly descriptions and future run estimates.
Image Comparison Diff
Compare two images side-by-side or with an interactive split slider entirely in browser canvas memory.
Cryptographic Hash Generator
Calculate instant SHA-256, SHA-512, SHA-384, SHA-1 and HMAC checksums using client-side Web Crypto API.
Environment Variables Diff & Vault
Compare .env files, detect missing keys across environments, mask secrets, and generate safe .env.example files.
Webhook Inspector & Mock Receiver
Receive, inspect, and simulate incoming HTTP webhooks and payloads with real-time payload debugging.