JSON schema for an array

Question

I've a JSON Schema and a sample input. I need to write a generic schema which can handle the array regardless the length of the array. Currently, I need to write schema for each of the index in the array.

JSON Schema

{
  "title":"Example",
  "$schema":"http://json-schema.org/draft-04/schema#",
  "type":"array",
  "items":[
    {
     "oneOf":[
       {
         "multipleOf": 3
       }
     ]
    },
    {
      "oneOf":[
       {
         "multipleOf": 3
       },
       {
         "multipleOf": 5
       }
     ]
    }
  ]
}

Sample Input

[
  3,
  5
]

I need a schema which can validate [1,3,5,6,3,5,4,......] (regardless the length)

cloudfeet · Accepted Answer · 2015-11-26 11:01:42Z

2

If you put a schema directly in items, instead of using an array, then it applies to all array items:

{
    "type": "array",
    "items": {
        "oneOf": [
            {"multipleOf": 3},
            {"multipleOf": 5}
        ]
    }
}

If you want to describe an initial set of items with specific schemas, and all the following ones with a generic one, then use an array with items, and a schema in additionalItems:

{
    "type": "array",
    "items": [
        {"multipleOf": 3},
        ...
    ],
    "additionalItems": {
        "oneOf": [
            {"multipleOf": 3},
            {"multipleOf": 5}
        ]
    }
}

edited Nov 26, 2015 at 11:01

answered Nov 25, 2015 at 9:20

cloudfeet

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4 Comments

Pranesh Ravi Over a year ago

What if I want a schema to validate a array in which the '0'th index of the array should be multiple of 2 and rest can have both multiples of 2 and 5. And the '0'th index is required.

Jason Desrosiers Over a year ago

You will also need to include "minItems": 1 to make the '0'th index required.

Pranesh Ravi Over a year ago

For the second schema with additionalItems the input [3,7] is getting validated. It should not be ryt?

Tim Boland Over a year ago

what if the array can contain a single null value like this [ null ]

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