The errors Validate catches most often
JSON is stricter than the JavaScript object syntax it resembles, and nearly every "invalid JSON" moment traces to one of a handful of habits. Trailing commas after the last item are legal in modern JavaScript but not in JSON. Keys must be double-quoted — name: fails where "name": parses. Single-quoted strings, comments, undefined, and NaN are all fine in a JS console and all rejected here, because the JSON specification simply does not include them. When Validate reports a line and column, look one character earlier than the position it names — parsers typically fail on the first character that no longer fits, which sits just after the actual mistake.
Chaining transforms is the real workflow
The individual actions are ordinary; the "use output as input" button is what makes this a studio. A CSV export from a spreadsheet becomes structured JSON in one step, flattens to dot-notation paths in a second so you can grep a single field, and un-flattens back after editing. An API response formats for reading, then minifies for pasting into a curl command. And when a deploy changes a config, JSON Patch Diff against the old version produces an RFC 6902 operation list — a precise, machine-applicable statement of what changed, which is often more useful in a pull request or incident note than two full files side by side.
Everything runs locally in your browser, which is not just a privacy nicety — it changes what you can safely paste. Payloads with bearer tokens, personally identifiable data, or internal URLs never leave your machine, so the tool is usable for exactly the debugging sessions where an online formatter would be a policy violation. It also means the page keeps working when your connection does not.