DevTul – 12 Dev Tools, 100% Local
12 dev tools — JSON, YAML, regex, hash, JWT & more. 100% loc
DevTul is a collection of 12 developer tools that run entirely in your browser — covering JSON, YAML, Markdown, regex, hash, JWT, Cron, and other everyday scenarios. Everything is parsed and computed locally on your device: no uploads, no logs, no waiting. Whether you need a JSON viewer, Base64 encoder, UUID generator, or Cron expression builder, DevTul works instantly, requires no account, and even functions offline once loaded.
Features
12 tools covering JSON, YAML, Markdown, regex, Base64, URL, JWT, UUID, hash, Cron and more
100% local processing — your data never leaves your device
No account, no quotas, no ads — just open and use
Works fully offline once the page is loaded
Keyboard-friendly: press "/" to search any tool instantly
MIT-licensed dependencies
Use Cases
Format and inspect JSON or YAML configs with a visual tree view
Decode JWT tokens to verify header, payload, and HS256 signature
Test and debug regex patterns with real-time highlighting and capture groups
Generate UUIDs, hashes (MD5/SHA-1/SHA-256/SHA-512), or Cron expressions in bulk
Compare text files with line-by-line and word-by-word highlighting
Comments
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