Variable Properties in JSON Schema

Question

I have the following example JSON, for which I want to write a JSON Schema. The constraint is that property2 holds a list of string, which are dynamic, depending on the dataset. And in the property3 object some of the properties are named afters those strings.

 {
   "property1": "value",
   "property2": ["value1","value2","value2"],
   "property3": {
                   "title": "test",
                   "value1": "hello",
                   "value2": "world"
    }
 }

A JSON-Schema might look like this, but I don't know how to describe that the dynamic properties. Is that possible?

 {
   "title": "Test Object",
   "type": "object",
   "properties": {
              "property1": {
                     "type": "string"
               }
              "property1": {
                     "type": "array"
               }
              "property3": {
                     "type": "object",
                     "properties": {
                               "title": {
                                     "type": "string"
                               }
                               [ Something is missing here ]
                      }
               }
    }
 }

jruizaranguren · Accepted Answer · 2014-08-28 07:13:54Z

1

You can not relate property values to property keys with Json-Schema (as of Draft v4).

You can:

Define property2 as an schema and reference it (#ref) from property3 (dependencies,allOf, anyOf, additionalProperties...). If these property names are very dynamic in your case you might build this schema on the fly.
Use patternProperties in order to retrict valid property names in property3 to some fixed regex.

answered Aug 28, 2014 at 7:13

jruizaranguren

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