Validating Mandatory String values in JSON Schema

Question

I have below sample schema. I need to ensure that there should be at least one occurrence of "name": "This is Mandatory" in the json file

Is it possible to achieve this ? Kindly help.

   "SchemaList": {
      "type": "array",      
      "additionalItems": false,
      "items": { "$ref": "#/definitions/Schema1" }          
        },
   "Schema1": {
      "type": "object",         
      "properties": {
        "description": { "type": "string" },
        "name": { "type": "string" }        
            }
        }

Answer 1

The latest draft (Draft 6) introduces a new keyword "contains" , with which you can express that a given schema should match at least one element in the array. You can use it this way:

{
    "SchemaList": {
        "additionalItems": false,
        "contains": {
            "properties": {
                "name": {
                    "const": "This is Mandatory"
                }
            },
            "required": [
                "name"
            ]
        },
        "items": {
            "$ref": "#/definitions/Schema1"
        },
        "type": "array"
    }
}

But bear in mind that the latest draft version of json-schema has only a very few implementations , so depending on the library you use, the "contains" keyword might not work.

Answer 2

Please refer this link for more details: http://json-schema.org/example1.html

{
"SchemaList": {
    "type": "array",
    "additionalItems": false,
    "items": {
        "$ref": "#/definitions/Schema1"
    }
},
"Schema1": {
    "type": "object",
    "properties": {
        "description": {
            "type": "string"
        },
        "name": {
            "type": "string"
        }
    }
},
"required": ["name"]
}