JSON tool comparison
JSON Formatter Comparison 2026
SafeJSON is built around verifiable privacy: open DevTools -> Network, paste JSON, and check that no request contains your data. Compare that with server-side JSON tools, browser-native viewers, and editor workflows.
| Feature | SafeJSON | jsonformatter.org | jsonviewer.stack.hu | Firefox Native | VS Code |
|---|---|---|---|---|---|
| Client-side | Yes | No (server) | No clear claim | Yes | Yes |
| Verifiable in Network tab | Yes | No | No | Yes | Yes |
| Data breach history | None | 80K credentials leaked | None | None | None |
| Open source | MIT | No | No | Yes | Yes |
| JSON Diff | Yes (Pro) | No | No | No | No |
| JWT Decoder | Yes (Pro) | No | No | No | No |
| JSONPath | Yes (Pro) | No | No | No | No |
| Schema Validator | Yes (Pro) | No | No | No | No |
| Ads | None | Yes | None | None | None |
| Large file handling | 50MB (Formatter) | Limited | Limited | Limited | ~10MB |
| Price | Free / $5 Pro | Free (ads) | Free | Free | Free |
Why SafeJSON is different
Most JSON tools ask you to trust their privacy claim. SafeJSON turns that claim into something you can verify. Once the page is loaded, formatting, parsing, viewing, diffing, JWT decoding, JSONPath querying, and schema validation run in the browser.
That also changes large file workflows: SafeJSON Formatter and Beautifier are tested with 50MB JSON locally, so sensitive logs do not need to leave your machine.
The jsonformatter.org incident
In November 2025, jsonformatter.org and codebeautify.org were reported to have exposed more than 80,000 submitted snippets, including cloud keys, tokens, passwords, and banking details.
SafeJSON avoids that failure mode by design: there is no server-side JSON processing pipeline for user content to leak from.
How to verify any JSON tool
- Open the tool in your browser.
- Open DevTools and switch to the Network tab.
- Paste JSON and run the formatter, viewer, diff, decoder, or parser.
- If a new request contains your data, the tool uploaded it. SafeJSON does not upload pasted JSON while processing it.
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