jsonschema validation with custom display name

schema-validation.js

const validate = require('jsonschema').validate;

let schema = {
    "type": "object",
    "properties": {
        "x": {
            "display": "X Coordinate",   // This is some extra field that we give for our purpose
            "type": "number",
            "required": true             // error says like 'is required'
        },
        "y": {
            "display": "Y Coordinate",
            "type": "number",
        },
        "address": {
            "type": "object",
            "properties": {
                "city": {
                    "type": "string",
                    "required": true
                },
                "state": {
                    "display": "State / Province",
                    "type": "string",
                    "required": true
                }
            },
            "required": true
        }
    },
    "required": [
        "y"              // error says like 'requires property "y"'
    ]
}

let json = {
    // "x": "34",
    // "x": 34,
    // "y": false,
    "address": {
        // "city": "Madurai"
    }
}

let result = validate(json, schema);
console.log(JSON.stringify(result, null, 2));

// length of "instance." is 9
let errorMessages = result.errors.map(e => e.schema.display ? (e.schema.display + ' ' + e.message) : e.stack.substr(9))
console.log(errorMessages);

Output is

[
  'X Coordinate is required',
  'address.city is required',
  'State / Province is required',
  'requires property "y"'
]