Show HN: Restring – a fast, smart web toolbox for JSON, JWT, Base64, and more

I just built Restring — a fast, modern toolbox for everyday dev tasks like formatting JSON, decoding JWTs, and converting strings.

I know there are plenty of similar tools out there, but I wanted something that felt instant and smart.

- Fast: Built with SvelteKit and plain HTML/CSS, with minimal dependencies and no UI bloat. The whole site is under 300 KB zipped and feels lightning quick. - Smart: It tries to detect what you paste (like JSON, JWT, or Base64) and routes you to the right tool automatically.

Currently supports: Base64, JSON, JWT, URL, Color, and DateTime.

I’ve used React, Vue, and Flutter before, but building this with SvelteKit was a joy — intuitive, minimal, and just works.

Would love feedback, especially on the auto-detection logic and ideas for other tools to add.