react-jsonschema/docs/schemas/arrays.json

React forms with JSONSchema

{
  "title": "Arrays Demo",
  "type": "object",
  "properties": {
    "websites": {
      "title": "Websites",
      "type": "array",
      "items": {
        "type": "string",
        "title": "URL"
      }
    }
  }
}