> whoami
Small, sharp tools every developer reaches for.
Connection strings, cron expressions, JWTs, regex, appsettings.json — the stuff you look up every few months and never remember. No signup, no server round-trip, and nothing you type ever leaves your browser.
drive the site from here — type
help and press Enter> cat featured.md
json-formatter — the invisible characters a whitespace cleanup misses
Copy JSON out of Jira, Confluence, or Word and it quietly picks up characters you cannot see. Plenty of formatters strip a stray non-breaking space for you — but a zero-width space is not whitespace at all, so a whitespace cleanup walks straight past it:
the input — there is a hidden character after the comma
{ "user": "Jane", "role": "admin" }what JSON.parse says
Expected double-quoted property name in JSON at position 18 (line 1 column 19)
what this one says
Removed 1 zero-width character (U+200B) at line 1, col 19
Twenty-one of these get handled, and only outside string literals — so a non-breaking space that is genuinely part of your data is left exactly as you wrote it.
> ls
tools/
Browser-based utilities for JSON and config, encoding, text and diff, hashes, plus .NET-specific helpers for cron expressions, connection strings, and GUIDs
22 items
guides/
Reference guides for the syntax and error messages developers look up most — the cron fields, JWT internals, and JSON failure modes you would otherwise re-derive every few months
9 items
Built by a backend engineer who kept losing the same five minutes to Googling connection string syntax and cron field order. Every tool runs in your browser — no accounts, and nothing you type into one is ever sent anywhere. See the privacy policy for what analytics and, eventually, advertising on this site do collect. If a tool is wrong or missing something, tell me.