Every developer has a handful of five-second tasks that come up constantly — pretty-printing a blob of JSON, generating a UUID for a test fixture, checking why two config files don't match. Most tool sites for this are slow, ad-choked, or ask you to sign up for something you'll use twice a year.
That's why I built ToolStash — a small, growing collection of developer utilities that run entirely in the browser:
- Diff Checker — line-by-line or word-by-word comparison
- Hash Generator — MD5, SHA-1, SHA-256, SHA-512, NTLM
- UUID Generator — single or bulk (up to 100 at once)
- JSON Formatter — beautify, validate, minify
- YAML to JSON Converter
- Markdown to HTML Converter — with live preview
- SQL Formatter — supports MySQL, PostgreSQL, SQL Server, Oracle, BigQuery, Snowflake, SQLite
- Regex Tester — live match highlighting and capture groups
Why client-side only?
Every tool runs as plain JavaScript in your browser. There's no backend for your input to pass through, so nothing you paste is ever uploaded — which matters if you're debugging something with real (if low-stakes) data in it, like a config file or a sample record.
What's next
I'm adding new tools regularly — base64 encode/decode, a cron expression builder, and a password generator are next up. If there's a utility you find yourself needing often, I'd love to hear about it in the comments.
Try it: https://toolstash.tools
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