Small tools for the parts of a dev's day that shouldn't need a tab full of ads.
JSON formatting, JWT decoding, hashing, encoding, and the other five-second jobs you reach for daily — free, no signup, and processed entirely in your browser. Nothing you paste here is ever sent to a server.
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Categories
All categories →Ten categories, fifteen tools launching in order — each one built the way the rest of Nesake is: local-first, documented, and honest about what's live.
JSON Tools
13 tools — the largest cluster in the hubFormat, validate, diff, repair, and convert JSON to and from YAML, CSV, TypeScript, JavaScript, and Python — all in one place.
Popular tools
Sorted by how often we reach for them ourselvesFeatured tool
JSON Formatter & Validator
Beautify, validate, and catch syntax errors in JSON with inline highlighting — the tool that anchors the whole hub, and the template every other tool page follows: a real explanation, a worked example, and no server round-trip.
By the numbers
Docs & articles
All posts →Each tool ships with a real explanation of the mechanism behind it — not filler. These land alongside the tools themselves.
How this hub works
Everything runs in your browser
JSON, JWTs, hashes, and text never leave your device. There's no upload step and no server copy to worry about — the same architecture as the rest of Nesake's tools.
Honest about what's live
A tool only gets a "live" badge once it's actually usable. Everything else is marked "in development" — we don't pad the catalogue with placeholders.
Built to grow
New categories — API testing, GraphQL, DNS, cron, color tools — slot in without a rebuild. Bookmark a favorite and it'll be here next time.