JSON schema for object with either A and B or C required properties

Question

I have two possible JSON objects for one request:

{
  "from": "string",
  "to": "string",
  "text": "string"
}

or

{
  "number": "integer",
  "text": "string"
}

In both cases "text" property is optional. Other properties are required (either "number, or both "from" and "to").

What will be the correct JSON schema to validate this?

Answer 1

Here is another solution that I think is a bit more clear. The dependencies clause ensures that "from" and "to" always come as a pair. Then the oneOf clause can be really simple and avoid the not-required boilerplate.

{
  "type": "object",
  "properties": {
    "from": { "type": "string" },
    "to": { "type": "string" },
    "number": { "type": "integer" },
    "text": { "type": "string" }
  },
  "dependencies": {
    "from": ["to"],
    "to": ["from"]
  },
  "oneOf": [
    { "required": ["from"] },
    { "required": ["number"] }
  ]
}