JSON Validator
Validate JSON as you type. The validator tells you instantly whether your JSON is valid and, if not, what is wrong and on which line and column.
This tool runs entirely in your browser.
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How to use the JSON Validator
- 1Paste JSON into the box.
- 2The result updates as you type: a green check for valid JSON, or the error with its position.
- 3Fix the error and watch the status turn green.
What is the JSON Validator?
JSON validation checks that text follows the JSON grammar defined in RFC 8259: double-quoted strings and keys, no trailing commas, no comments, and only the values true, false, null, numbers, strings, arrays and objects.
Frequently asked questions
Does the validator check against a JSON Schema?
No. It checks syntax only — whether the text is valid JSON — not whether the data matches a particular schema.
Is the JSON Validator free and private?
Yes. The JSON Validator is free, needs no account, and runs entirely in your browser. What you type is never sent to a server or stored.