Json schema validation for property that can only be set once on an object inside an array

Question

Is it possible to validate the json data below, so that "info" can only be filled in when "name" is "a" otherwise it must be empty or null?

[
  {
    "name": "a",
    "info": "this is mandatory"
  },
  {
    "name": "b",
    "info": "validation must fail"
  }
]

the JSONSchema

{
 "title": "Array of things",
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "name": {
        "type": "string",
        "enum": [
          "a",
          "b"
        ]
      },
      "info": {
        "type": "string"
      }
    }
  }
}

The json in an online editor

YouryDW · Accepted Answer · 2018-02-21 14:27:55Z

2

try this:

{
 "title": "Array of things",
  "type": "array",
  "items": {
   "type": "object",
   "properties":  {
      "name": {
         "type": "string",
        "enum": ["a", "b"]
      },
      "info" : {
         "type": ["string", "null"]         
      }
   },
   "required": ["name"],

   "oneOf": [
      {
         "properties": {
             "name": {"enum": ["a"] }
         },
         "required": ["info"]
      },
     {
         "properties": {
             "name": {"enum": ["b"] },
"info": {"enum": [null]}
         }         
      }
   ]
}
}

answered Feb 21, 2018 at 14:27

YouryDW

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1 Comment

Relequestual Over a year ago

This will work for draft-4, but if the library you have uses a newer draft like draft-7, you can use if/then/else (if you want to). I won't add an answer as you've already accepted this one.

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