DevToolkit Pro
All-in-one developer toolkit · Privacy-first · 100% in-browser computation
JSON
Online JSON formatter, minifier, and validator. One-click convert to TypeScript interface, Go struct, and Java class. Unicode-safe, supports nested objects and arrays.
API
pages.tools/api-tester.description
Utils
Encoding toolkit: Unicode-safe Base64 encoder/decoder, URL encoder/decoder, JWT decoder (with HS256 signature verification), regex tester (with flags support), UUID v4 / NanoID / ULID generator, HTML Entity encoder/decoder.
Crypto
Crypto toolkit: SHA-1/256/384/512 hash calculation, HMAC signing (SHA-256/512), AES-GCM encryption/decryption (PBKDF2 key derivation 256-bit). Built on native Web Crypto API, keys never leave the browser.
Code
Prettier-based code formatter supporting JavaScript, HTML, CSS, and SQL. Also provides safe minification (protects string literals from being broken).
Tools
Developer utilities: HEX ↔ RGB color converter, password generator (crypto.getRandomValues), Unix timestamp converter (auto-detects s/ms/µs), Cron expression parser, IPv4 CIDR calculator, text diff (Monaco DiffEditor).
Data
Data format toolkit: Markdown live preview (GFM), YAML ↔ JSON bidirectional conversion, CSV ↔ JSON conversion (header detection and type inference), JSONPath query (supports filters and recursive descent), JSON Schema validation (with format checks).