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JSON Schema Editor / Graphical Notation Overview / Properties Container / PropertyNames
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    PropertyNames
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    Draft 04 Draft 06 Draft 07 Draft 2019-09

    The propertyNames property makes it possible to define rules that specify the property names that are allowable within the JSON Instance object.

    Example JSON Schema
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    "MyObject": {
        "type": "object",
        "additionalProperties": {
            "type": "string"
        },
        "propertyNames": {
            "type": "string",
            "pattern": "VAL_\\d+"
        }
    },
    

    In this example "MyObject" is describes an object that can contain string properties with any name. The Property Names rules imposes a limitation on the property names, specifying that they must match the Pattern (regular expression) "VAL_\d+".

    Example JSON Instance Document
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    "MyObject": {
        "VAL_1" : "My Value",
        "VAL_4" : "My Value",
        "VAL_0001" : "",
        "VAL_1" : "Some other value"
    }
    

    The functionality is very similar to Pattern Properties, but allows more control and can be easier to read.