Is a quoted string valid JSON?

Yes. "hello" is valid JSON — a JSON string value. Not all valid JSON is an object or array; a bare string, number, boolean, or null are all valid top-level JSON values.

What is the difference between a JSON string and a JSON object?

In JSON, a "string" refers to a text value (e.g. "hello"). A "JSON object" refers to the key-value structure {…}. A valid JSON document can be any of these types at the top level.

Can I validate an empty string as JSON?

An empty string "" is a valid JSON value (it is a JSON string). A completely blank input (nothing at all) is not valid JSON.

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Validate a JSON String

Need to check whether a string of text is valid JSON? Paste it into FixTools and validate it in one click. This works for any JSON value — objects, arrays, strings, numbers, booleans, and null — not just objects.

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Validates any JSON value, not just objects

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Checks strings, arrays, and primitives too

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JSON Validator

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How to use this tool

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Paste the JSON string you want to check and click Validate.

How It Works

Step-by-step guide to validate a json string:

1
Paste your JSON string
Copy the JSON string you want to validate and paste it in.
2
Click Validate
FixTools parses the string and confirms whether it is valid JSON.
3
Read the result
Green means the string is valid JSON. Red means there is a syntax error — the location and description are provided.