像猫鼬模式设计一样，如何在javascript对象中设置属性的类型？

Question

I am trying setting type for a key of an object in javascript. var obj ={}; obj.name = string; obj.age = number; obj.approve = false; it is more like designing mongoose schema. eg.

var mongo = require('mongoose');
var mySchema = new mongo.Schema({
"name":{type: String},
"version":{type: String},
"author":{type:String}
});

so that while saving object mongoose check the type. How can i perform this functionality with normal javascript object while declaring it. so that i can perform type checking for incoming API request for an object. I hope you all understand what i want to achieve.

Answer 1

You need to use JSON schema validator, like following: https://www.npmjs.com/package/ajv

Short example:

var Ajv = require('ajv');
var ajv = Ajv();
var schema = {
  "type": "object",
  "properties": {
    "foo": { "type": "number" },
    "bar": { "type": "string" }
  },
  "required": [ "foo", "bar" ]
};

var data = { "foo": 1 };

var validate = ajv.compile(schema);

console.log(validate(data)); // false