Assigning a value to an attribute as either a "string" or null within JSON Schema while specifying a maximum length

I'm currently working on crafting a JSON schema that supports a nullable attribute. I am aiming to have the ability for specific JSON structures like this one be considered valid:

{
 "some_name" : null
}

This is how my schema looks like:

{
  "type": "object",
  "properties": {
    "some_name": {
      "type": [
        "string",
        null
      ],
      "maxLength": 100
    }
  }
}

Unfortunately, it's marked as invalid due to the fact that it doesn't recognize that "null" can also have a maxLength property assigned. Is there a more effective way to achieve this? It would be ideal to have a "nullable" characteristic or something similar for cases like this!

javascriptjsonjsonschemajson-schema-validator

Answer №1

By changing the type in my SCHEMA from null to "null", I discovered that it triggers better validation. Null is considered its own schema-type, and this adjustment seems to do the trick.

{
  "type": "object",
  "properties": {
    "some_name": {
      "type": [
        "string",
        "null"
      ],
      "maxLength": 100
    }
  }
}

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