JSON Validator
Validate JSON and highlight common formatting problems.
JSON
Valid JSON
OK
Root type: object
Root type
object
Characters
21
Keys (if object)
2
In-depth explanation
Paste JSON to check whether it parses. Valid input shows the root type; invalid input shows the parser error message. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
Standard JSON: objects, arrays, strings, numbers, booleans, and null. Trailing commas and comments are invalid. It reports the error. Use the JSON Formatter once the syntax is fixed.
Validation runs locally in your browser. Tweak the inputs above to compare options, then copy or note the result you need.
Valid JSON is an object, array, string, number, boolean, or null. “Almost JSON” from JavaScript (unquoted keys, single quotes) will fail. The error message is from the parser — fix that line, then format.
Validation does not prove the payload matches a schema (required fields, types). It only proves it parses. Keep using tests or a schema validator for APIs.
Frequently asked questions
What counts as valid JSON?
Standard JSON: objects, arrays, strings, numbers, booleans, and null. Trailing commas and comments are invalid.
Does it fix errors for me?
No — it reports the error. Use the JSON Formatter once the syntax is fixed.
Is my JSON uploaded?
No. Validation runs locally in your browser.
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