A JSON formatter that never sees your data
Pasting a production API response into a random formatter means handing over whatever it contains — customer names, internal ids, sometimes a bearer token. Tool Genie parses JSON with the engine already in your browser, so the payload stays in the tab.
Nothing is transmitted or logged
There is no request to inspect and no server-side log. That is the whole reason to prefer a local formatter for work data.
Precise error positions
Invalid JSON is reported with the line and column of the first problem, instead of a generic parse failure.
Conversion built in
The same payload can go straight to CSV, YAML or a sorted copy for diffing, without pasting it into a second site.
Fast on large payloads
There is no upload step, so a multi-megabyte response formats as quickly as your device can parse it.
| Tool Genie | Typical online tool | |
|---|---|---|
| Where JSON is parsed | In your browser | Often posted to a server |
| Safe for production data | Yes | Depends on the operator |
| Error detail | Line and column | Varies |
| Built-in conversion | CSV, YAML, sorted keys | Varies |
| Price | Free, every tool | Usually free with ads |
Indicative comparison — other services change their plans and limits over time. Tool Genie is not affiliated with online JSON formatters.
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Frequently Asked Questions
Can I paste an API response with real data?
Technically yes — nothing is uploaded or stored. Follow your organisation's policy, but the tool itself never transmits what you paste.
Does it handle very large files?
Documents of several megabytes format instantly. Beyond roughly 20 MB you are limited by the memory of the browser tab.
What else is in the developer toolbox?
A JWT decoder, hash and UUID generators, a regex tester, diff checker, timestamp and base converters, plus CSV, YAML, XML and SQL formatting.