JSON Validator
Validate your JSON syntax and show detailed errors if any.
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Output
About this tool
All data is processed locally in your browser. No information is sent to our servers.
About this tool
The JSON validator is an essential tool for developers that allows verifying whether text conforms to correct JSON (JavaScript Object Notation) syntax. This tool analyzes the JSON structure, verifying that quotes are properly matched, commas are in the right places, data types are valid, and the overall structure conforms to the ECMA-404 standard. When an error is detected, the validator shows a descriptive message indicating the type of problem and its approximate location, greatly facilitating debugging of malformed JSON. It's especially useful when working with APIs, configuration files, or when you need to validate data before processing it in an application. The tool processes everything locally in your browser using the native JSON.parse() API, ensuring that sensitive data is never sent to external servers. It supports all valid JSON structures including objects, arrays, strings, numbers, booleans, null, and nested structures.
Use cases
- Validate API responses before processing them
- Verify JSON configuration files before using them
- Debug syntax errors in malformed JSON
- Ensure data conforms to JSON standard before storage
Frequently asked questions
- What JSON errors can the validator detect?
- The validator can detect errors like unclosed quotes, misplaced commas, invalid data types, malformed nesting, invalid control characters, and any violation of the JSON ECMA-404 standard.
- Does the validator modify the original JSON?
- No, the validator only analyzes and verifies the JSON syntax. It doesn't make any changes to the original content.
- What's the difference between validating and formatting JSON?
- Validating verifies that JSON has correct syntax according to the standard. Formatting changes the visual presentation (indentation, line breaks) to make it more readable, but doesn't necessarily validate.
- Can I validate JSON that contains comments?
- No, the official JSON standard doesn't support comments. If your JSON contains comments, it won't be valid. For JSON with comments, consider using JSON5 or other alternative formats.