Question 1

How do I validate JSON with a schema?

Accepted Answer

Paste JSON on the left and the schema on the right, then click Validate. Use Format to tidy either side, or load the built-in samples to try quickly.

Question 2

What is JSON Schema?

Accepted Answer

JSON Schema is a vocabulary for describing JSON documents—types, required fields, formats, and more—often used for validation and documentation.

Question 3

How do I generate a schema from JSON?

Accepted Answer

Put valid JSON on the left and click Generate schema from JSON. A draft schema appears on the right; refine constraints as needed.

Question 4

What validation features are supported?

Accepted Answer

Powered by Ajv with ajv-formats for common keywords and formats like email and date; failures list paths and reasons.

Question 5

How should I read validation errors?

Accepted Answer

Each item includes an instance path and a keyword-specific message—use the path to jump to the offending field in your JSON.

Question 6

Can I copy the results?

Accepted Answer

Select the on-screen text in the results area to copy it, or format the panes first for easier sharing into other tools.

JSON Schema Validator | Online JSON Data Checker