JSON schema to allow date or empty string

问题

I need to define a JSON schema wherein the input can either be a date or empty string.

My current JSON schema is

{
    "type": "object",    
    "required": [        
        "FirstName",        
        "DateOfBirth"
    ],
    "properties": {
        "FirstName": {
            "type": "string"
        },        
        "DateOfBirth": {            
            "type": "string", 
            "format": "date"
        }
    }
}

This allows

{    
    "FirstName": "Alex",
    "DateOfBirth": "1980-10-31"
}

but not

{    
    "FirstName": "Alex",
    "DateOfBirth": ""
}

How can I define the JSON schema so that DateOfBirth allows dates as well as empty string.

回答1:

Remove DateOfBirth from required list:

{
    "type": "object",    
    "required": [ "FirstName" ],
    "properties": {
        "FirstName": {
            "type": "string"
        },        
        "DateOfBirth": {            
            "type": "string", 
            "format": "date"
        }
    }
}

Supported JSON:

1. DateOfBirth is set:

{    
    "FirstName": "Alex",
    "DateOfBirth": "1980-10-31"
}

2. DateOfBirth isn't set:

{    
    "FirstName": "Alex",
}

Since you've added basic semantic validation for date values, you need to make sure the provided value follows the given format. Empty string ("") isn't a valid date format.

来源：https://stackoverflow.com/questions/61483435/json-schema-to-allow-date-or-empty-string