Array and Composition Schema in JSON

From the JSON cheat sheet · JSON Schema · verified Aug 2026

Validate collections and combine reusable rules.

json

{
  "type":"array",
  "items":{"type":"string"},
  "uniqueItems":true
}

📌 items applies a schema to array elements

💡 $defs and $ref reuse schema fragments

🔍 allOf requires every subschema to match

⚠️ oneOf requires exactly one match

json-schemaarrayscomposition

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