GreatJSONValidator

Install

npm install great-json-validator

Example

Let's start with an easy example:

const validator = require('great-json-validator');

let schema = {
  type: 'object',
  required: true,
  properties: {
    email: { type: 'string', required: true },
    password: { type: 'string', required: true, length_greater_than: 8 },
  }
}

let data = { email: "[email protected]", password: "googlePassword1" };

console.log(validator(schema, data));

// Returns { success: true }

Complete example

Let's see an example with all the data types and all use cases, so that you can see how powerful and easy this validator is:

const validator = require('great-json-validator');

let schema = {
    type: 'object',
    additionalProperties: false,
    required: true,
    properties: {
        string: { type: 'string', required: true, format: "iso8601", validate(data) { return true; } },
        string2: { type: 'string', matches: /\d-(?:days|weeks|months|years)/},
        string3: { type: 'string', matches: /^y[1-5]m[1-9](?:[0-2])?$/ },
        number: { type: 'number', required: true, less_than: 10, greater_than: 1, equal_to: 9 },
        undefined: { type: 'undefined', required: true },
        null: { type: 'null', required: true },
        boolean: { type: 'boolean', required: true },
        object: {
            type: 'object',
            additionalProperties: true,
            required: false,
            validate(data, allData) {
                return true;
            },

            validateEach(key, value) {
                return true;
            },
            properties: { number: { type: 'number', required: true }}
        },
        array: { type: 'array', items: { type: 'string', required: false }},
        array_object: {
            required: true,
            type: 'array-object',
            items: {
                type: 'string',
                required: true
            }
        }
    }
}

let data = {
    string: "2019-06-26T20:06:18.658Z",
    string2: "12323-days",
    undefined: undefined,
    string3: "y1m9",
    number: 20,
    null: null,
    boolean: true,
    object: {
        number: 2
    },
    array: ['hi', 'hello', 'hey', 2],
    array_object: {
        'item1': 1,
        'item2': '2',
        'item3': '3',
        'item4': '4',
    }
};

console.log(validator(schema, data, { validateAllFields: true }));

If you don't care what the errors are or how many there are, we recommend turning off validateAllFields, it will stop once it finds an error and don't waste time validate the rest of fields.

This will log the following information:

{
  "success": false,
  "error": true,
  "errors": [
    {
      "path": "object.number",
      "data": 20,
      "error_code": null,
      "error_message": "object.number is not less than 10"
    },
    {
      "path": "object.array[3]",
      "data": 2,
      "error_code": null,
      "error_message": "object.array[3] is not a string"
    },
    {
      "path": "object.array_object.item1",
      "data": 1,
      "error_code": null,
      "error_message": "object.array_object.item1 is not a string"
    }
  ]
}