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Validate JSON against a JSON Schema using AJV.
The JSON Schema Validator checks a JSON document against a JSON Schema using AJV, the standard high-performance validator. It reports every violation with the exact instance path and the rule that failed, so you know precisely what to fix. Use it to enforce contracts on API payloads, config files, and any structured data.
Paste the schema that defines the rules your data must satisfy.
Add the document you want to validate against that schema.
AJV checks the document and lists any violations with their paths.
Correct each reported issue and validate again until the document passes.
The age is below the schema minimum.
Input
// schema
{ "type": "object",
"properties": { "age": { "type": "integer", "minimum": 18 } },
"required": ["age"] }
// data
{ "age": 15 }Output
Invalid: /age must be >= 18 (minimum).Infer a JSON Schema from a sample JSON document.
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