How to require a property B when a boolean property A is true

Question

Using JSON Schema, how can I specify that property bar is required when property foo (a boolean) is set to true?

I've tried the following:

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

However, this fails to validate:

{
  "foo": false
}

because it seems bar is still required despite foo being false:

Message:
    Required properties are missing from object: bar.
Schema path:
    #/then/required

I've also tried this:

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

But this accepts the following JSON, which should be considered invalid:

{
  "foo": true
}

I've already seen this answer, but it uses type string for foo, which works fine. I need foo to be boolean.

How can I stipulate that `bar` is required when `foo` is `true`?

I'm voting to close because this is a simple typo sort of error. — Relequestual, Dec 18 '19 at 09:19

score 1 · Accepted Answer · answered Dec 18 '19 at 09:17

1

You were SO CLOSE to getting this right.

Your use of const was correct, but the value is a string as opposed to a boolean value. You want...

"foo": { "const": true }

Live demo

answered Dec 18 '19 at 09:17

Relequestual

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How to require a property B when a boolean property A is true

How can I stipulate that bar is required when foo is true?

1 Answers1

How can I stipulate that `bar` is required when `foo` is `true`?