DevToolkitCo - Free, fast, and privacy-focused tools for developers
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Free online developer tools for Bun.js, Node.js, JSON, and more. Bundle analyzer, JSON builder, formatters, converters, fixers and other utilities.
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2 AM. Debugging a webhook. The JSON was broken everywhere. I had 5 tabs open. One to fix the JSON. One to format it. One to convert to TypeScript. One to diff against the expected schema. Each tool had ads, slow load times, and sent my data to their servers. But they all feel like they were built in 2010.
Pain driven development kicked in and I built DevToolkit:
- Runs 100% in your browser (your data never leaves)
- Auto-fixes broken JSON (comments, Python syntax, missing commas)
- Converts JSON → TypeScript, Python, Pydantic, CSV, SQL
- Share your exact output via URL
- Clean UI. Fast. No bloat.
Built on Next.js 15. Every tool loads instantly.
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