Side by side
JSON OS vs PerfectJSON
Both stand on json tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
JSON OS brings a broad set of JSON editing and Markdown authoring tools into a browser workbench. Its local-processing approach, comparison and query tools, and varied Markdown exports make it useful for working with both formats in one place.
Visit JSON OS Free plan Web
Choose PerfectJSON for browser-based JSON editing, validation, comparison, and conversion, especially when preserving large numeric values matters. Look elsewhere if you need JSONPath or jq queries, batch processing, or a service without display ads.
Visit PerfectJSONThe facts
| JSON OS | PerfectJSON | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | jsonos.online | perfectjson.com |
| On json tools | #23 of 29 | #27 of 29 |
JSON OS: what it does well
- Tree, text, and table editing views
- JSON Schema validation and syntax repair
- Side-by-side comparison and MongoDB-style filters
- Markdown supports Mermaid diagrams and KaTeX
- JSON and Markdown export options
What to know first
- Workspace is limited to three panes
- Available on web only
PerfectJSON: what it does well
- Free to use with no accounts or usage limits.
- Validates against four listed JSON specifications with line and column errors.
- Auto-fix handles several common JSON syntax issues.
- Supports tree, table, and raw text editing.
- Processes JSON locally and does not upload edited content.
What to know first
- Requires JavaScript to be enabled in a supported browser.
- The free service is supported by display ads.
- No JSONPath, jq, or batch processing.
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