What information is shown for valid JSON?

For valid JSON, the tool displays the data type (object, array, string, number, boolean, or null), the number of top-level keys (for objects) or items (for arrays), and the size in bytes.

What errors can this tool detect?

The tool detects all JSON syntax errors including missing commas, unclosed brackets, trailing commas, single quotes instead of double quotes, and unquoted keys.

Does it validate against a JSON Schema?

No. This tool validates JSON syntax only. It checks whether your input is well-formed JSON, not whether it conforms to a particular schema.

JSON Validator

Check JSON syntax and get detailed error messages with line numbers. Validates before you ship to production. If valid, see the data type, key count, depth, and byte size. Runs entirely in your browser — your data never leaves your device.

Your files are processed entirely in your browser. Nothing is uploaded to any server.

How to Use JSON Validator

1
Paste or type your text
Enter your text in the input area. You can paste from clipboard or type directly.
2
See instant results
The tool processes your text automatically as you type. Adjust options if available.
3
Copy the output
Click the copy button to save the result to your clipboard. No data leaves your browser.

Frequently Asked Questions

Next Steps

Format valid JSON for readability

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