JSON Validator
Validate JSON input, pretty-print it for readability, or minify it for compact output.
Standard JSON only. Trailing commas, comments, and single-quoted keys are not valid JSON.
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Privacy: validation runs locally in your browser. No JSON data is stored or transmitted.
How it works
Paste JSON into the input area, validate it, and choose whether the output should be formatted for readability or minified for compact use.
Examples
- {"name":"Alex","age":30} → valid object JSON
- [1,2,3] → valid array JSON
- {"a":1,} → invalid because of a trailing comma
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you format and validate JSON data for readability and debugging. It runs entirely in your browser without sending data to a server.
You can use this tool when working with APIs or cleaning up structured data. The results should be interpreted as a properly formatted JSON structure or validation feedback.
FAQ
- What does this JSON validator do?
It checks whether your JSON is valid, and can also pretty-print or minify valid JSON.
- Does it support arrays and nested objects?
Yes. It validates standard JSON including nested arrays and objects.
- What happens if the JSON is invalid?
The tool shows a parse error and does not transform the content until the JSON is valid.
- Is my JSON stored?
No. Validation runs locally in your browser and is not stored or transmitted.