Only allow properties that are declared in JSON schema

json jsonschema
ipengineer picture ipengineer · Jul 8, 2013 · Viewed 22.8k times · Source

I am using json-schema and wanting to only allow properties that are declared in this file to pass validation. For instance if a user passes a "name" property in their json object it will fail this schema because "name" is not listed here as a property.

Is there some function similar to "required" that will only allow the listed properties to pass?

{
"$schema": "http://json-schema.org/draft-04/schema#",
"title": "Accounting Resource - Add Item",
"type": "object",
"properties": {
    "itemNumber": {
        "type":"string",
        "minimum": 3
    },
    "title": {
        "type":"string",
        "minimum": 5
    },
    "description": {
        "type":"string",
        "minimum": 5
    }
},
"required": [
    "itemNumber",
    "title",
    "description"
]
}

Answer

Jules picture Jules · Jul 8, 2013

I believe what you need to do to achieve this is set additionalProperties to false. See the specification here

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