jsonSchema attribute conditionally required

In jsonSchema you can indicate whether defined fields are mandatory or not using the "required" attribute:

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "properties": {
        "header": {
            "type": "object",
            "properties": {
                "messageName": {
                    "type": "string"
                },
                "messageVersion": {
                    "type": "string"
                }
            },
            "required": [
                "messageName",
                "messageVersion"
            ]
        }
    },
    "required": [
        "header"
    ]
}

In certain cases, I would like the messageVersion field not to be mandatory. Is there any way to make the mandatory-ness of the this field conditional?

Depending on your situation, there are a few different approaches. I can think of four different ways to conditionally require a field.

Dependencies

The dependencies keyword is a conditional variation of the required keyword. Foreach property in dependencies, if the property is present in the JSON being validated, then the schema associated with that key must also be valid. If the "foo" property is present, then the "bar" property is required

{
  "type": "object",
  "properties": {
    "foo": { "type": "string" },
    "bar": { "type": "string" }
  },
  "dependencies": {
    "foo": { "required": ["bar"] }
  }
}

There is also a short form if the schema only contains the required keyword.

{
  "type": "object",
  "properties": {
    "foo": { "type": "string" },
    "bar": { "type": "string" }
  },
  "dependencies": {
    "foo": ["bar"]
  }
}

Implication

If your condition depends on the value of a field, you can use a boolean logic concept called implication. "A implies B" effectively means, if A is true then B must also be true. Implication can also be expressed as "!A or B". Either the "foo" property does not equal "bar", or the "bar" property is required. Or, in other words: If the "foo" property equals "bar", Then the "bar" property is required

{
  "type": "object",
  "properties": {
    "foo": { "type": "string" },
    "bar": { "type": "string" }
  },
  "anyOf": [
    {
      "not": {
        "properties": {
          "foo": { "const": "bar" }
        },
        "required": ["foo"]
      }
    },
    { "required": ["bar"] }
  ]
}

If "foo" is not equal to "bar", #/anyOf/0 matches and validation succeeds. If "foo" equals "bar", #/anyOf/0 fails and #/anyOf/1 must be valid for the anyOf validation to be successful.

Enum

If your conditional is based on an enum, it's a little more straight forward. "foo" can be "bar" or "baz". If "foo" equals "bar", then "bar" is required. If "foo" equals "baz", then "baz" is required.

{
  "type": "object",
  "properties": {
    "foo": { "enum": ["bar", "baz"] },
    "bar": { "type": "string" },
    "baz": { "type": "string" }
  },
  "anyOf": [
    {
      "properties": {
        "foo": { "const": "bar" }
      },
      "required": ["bar"]
    },
    {
      "properties": {
        "foo": { "const": "baz" }
      },
      "required": ["baz"]
    }
  ]
}

If-Then-Else

A relatively new addition to JSON Schema (draft-07) adds the if, then and else keywords. If the "foo" property equals "bar", Then the "bar" property is required

{
  "type": "object",
  "properties": {
    "foo": { "type": "string" },
    "bar": { "type": "string" }
  },
  "if": {
    "properties": {
      "foo": { "const": "bar" }
    },
    "required": ["foo"]
  },
  "then": { "required": ["bar"] }
}

EDIT 12/23/2017: Implication section updated and If-Then-Else section added.

EDIT 06/04/2018: Bugfix for If-Then-Else and update singleton enums to use const.