Created by the author of Fast XML Parser.

This library exposes 2 type of XML validators

1. Syntax validator
2. Business rule validator (Schema)

Syntax validator

Validate XML file for syntax errors. It

const { SyntaxValidator } = require("fast-xml-validator");
const result = SyntaxValidator.validate(xmlData, { allowBooleanAttributes: true });

Options:

• allowBooleanAttributes: allow attributes without value (e.g <book published />)
• unpairedTags: list of tags without closing tags (e.g <br>, <hr>)
• docType: options for validating DOCTYPE entity count and size
  • maxEntityCount: maximum number of entities in DOCTYPE (default: Infinity)
  • maxEntitySize: maximum size of each entity in DOCTYPE (default: Infinity)

Business rule validator

This is somewhat like XML schema validator but with some or rather more additional features.Checkout the Business Rule Validato for more information.

const { BusinessRulesValidator } = require("fast-xml-validator");
const options = {};
const validator = new BusinessRulesValidator(rulesXml);

const result = validator.validate(xmlData, options);

Applications

• You want to ensure the data type or, minimum or maximum value for a field.
• You want to ensure the minimum or maximum occurences of a tag.
• You want to ensure the sequence of sibling tags.
• You want to ensure that the discounted price is always lesser than total price
• You want to be informed if there are students who scored less than 35 in any subject.
• You want to ensure that the shipment date must come after an order date.
• You want to ensure that a PO must have at least one order item
• You want to ensure that email is unique for all employees
• You have your own business validations.