JSON
AvailableJSON Formatter
Format, validate, minify, and sort JSON locally.
JSON input
Validate strict JSON locally. Validation runs only when you select Validate.
What this tool does
Validate strict JSON in your browser, see parser errors and location details, and inspect the structure after a successful validation. Nothing you enter is uploaded or automatically saved.
How to use
- Paste a JSON value into the editor.
- Select Validate or press Ctrl/⌘+Enter.
- Review the result and fix any reported syntax issue.
- Optionally format or minify validated JSON in place.
Limitations
This validates JSON syntax only. It does not validate JSON Schema, infer intended data types, or automatically correct input. Comments, trailing commas, single quotes, and JavaScript object literals are not valid JSON.
Frequently asked questions
Can a JSON document be a primitive value?
Yes. Strings, numbers, booleans, and null are valid JSON root values.
Why is my JavaScript object rejected?
JSON is stricter than JavaScript: property names and strings require double quotes, and comments are not allowed.
Does this validate a JSON Schema?
No. This tool checks strict JSON syntax only.
Practical guide
When to use it
Use it when an API, configuration loader, or command-line tool reports invalid JSON and you need the syntax location before changing the data.
Three steps
- Paste the complete JSON value, including its opening and closing bracket or brace.
- Run validation and read the reported line and column.
- Correct the syntax, then validate again before using the document.
Example and a common mistake
A missing comma after "name": "Ada" is a typical error this check can narrow down quickly.
Passing syntax validation does not prove that a response matches an API contract or JSON Schema.
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