validate array json contains several unordered objects using json schema

Question

Problem

I want to use json schema draft 7 to validate that an array contains several unordered objects. For example, the array should contains student A, B, regardless of their orders.

[{"name": "A"}, {"name": "B"}] //valid
[{"name": "B"}, {"name": "A"}] //valid
[{"name": "A"}, {"name": "C"}, {"name": "B"}] //extra students also valid
[] or [{"name": "A"}] or [{"name": "B"}] //invalid

Current Attempt

json schema contains keyword doesn't support a list

json schema Tuple validation keyword must be ordered

Relequestual · Accepted Answer · 2019-12-05 09:32:57Z

7

You want the allOf applicator keyword. You need to define multiple contains clauses.

allOf allows you to define multiple schemas which must all pass.

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "allOf": [
    {
      "contains": {
        "required": ["name"],
        "properties": {
          "name": {
            "const": "A"
          }
        }
      }
    },
    {
      "contains": {
        "required": ["name"],
        "properties": {
          "name": {
            "const": "B"
          }
        }
      }
    }
  ]
}

Live demo here.

edited Dec 5, 2019 at 9:32

answered Dec 4, 2019 at 14:02

Relequestual

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3 Comments

gregsdennis Over a year ago

You should put a required and a type in each of those, too.

Relequestual Over a year ago

required is necessary, but type is not required because const doesn't care about type. BUT, adding type couldn't hurt, and it shows intent.

Relequestual Over a year ago

Updated answer to reflect suggested changes.

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