JSON Validator Online
Paste your JSON to instantly validate its syntax and find errors. This free validator checks JSON structure, highlights the error position, and explains what went wrong.
How to Use
- Paste or type your JSON into the input field.
- The validator checks your JSON automatically as you type.
- If valid, you will see a green checkmark and structure statistics.
- If invalid, the error message shows the exact position and cause.
Features
- Instant validation as you type or paste
- Precise error position with line and column numbers
- Human-readable error messages explaining the issue
- Valid JSON indicator with green/red status
- Counts objects, arrays, keys, and nesting depth
- Works entirely in the browser with no server calls
Frequently Asked Questions
What does a JSON validator check?
A JSON validator checks that your data conforms to the JSON specification (RFC 8259). It verifies correct use of braces, brackets, quotes, commas, colons, and valid value types (strings, numbers, booleans, null, objects, arrays).
Is the validator free?
Yes, the JSON validator is completely free with no usage limits.
Does validation happen in my browser?
Yes. The entire validation process runs locally in your browser using JavaScript. No data is sent to any server.
What are common JSON syntax errors?
Common errors include trailing commas after the last item, single quotes instead of double quotes, unquoted property names, missing commas between items, and unclosed brackets or braces.
Can I validate large JSON files?
Yes. Since validation runs in your browser, it can handle files of any reasonable size limited only by your device's memory.