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JSON Schema Editor / Graphical Notation Overview / If Then Else
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    If Then Else
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     The 3 properties If, Then, Else make it possible to specify conditional validation rules for a schema. Each of them contains a JSON Schema.

    The schema described within the If clause is evaluated against the value in the JSON Instance Document.

    If a schema contains a Then or Else with no If, then the Then or Else will be ignored.

    Example JSON Schema
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    "Value": {
        "type": [
            "integer",
            "string"
        ],
        "if": {
            "type": "integer"
        },
        "then": {
            "type": "integer",
            "maximum": 9999,
            "minimum": 0
        },
        "else": {
            "type": "string",
            "maxLength": 4,
            "minLength": 1,
            "pattern": "\\d+"
        }
    },
    

    The schema describes a property called "Value" which can contain a string or a Number.

    If the value in the instance document is an integer, then the rules in the Then are applied meaning it must be in the range 0-9999.

    If the value is not an integer then it must be a string 1-4 chars long matching the regex pattern "\d+".

    Example Valid JSON Instance Document Fragments
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    "Value" : "1234"
    
    "Value" : 1234
    
    "Value" : "0"
    
    Example Invalid JSON Instance Document Fragments
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    "Value" : ""
    
    "Value" : 100000
    
    "Value" : "FRED"
    

    See Also