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🚀 Ajv - High - performance JSON Schema Validator

Ajv is a high - performance JSON Schema validator that supports Draft7 and Draft6 standards. It offers validation services at extremely high speed and has the following features:

• Ready to use: It can be used without additional configuration.
• Plugin support: Its functionality can be extended through plugins.
• Middleware support: It can be used as an Express middleware.

✨ Features

Core Features

• Core Validation: Strictly adheres to the JSON Schema standard.
• Error Reporting: Provides detailed error information for easy debugging.
• Performance Optimization: Highly optimized for extremely fast speed.
• Asynchronous Functionality: Supports asynchronous keywords and conditional expressions.
• Validator Plugins: Allows for the extension of the validator system.

JSON Schema Support

Ajv supports the following features:

• if, then, and else keywords.
• allOf, anyOf, oneOf, and not validation.
• const, enum, and multipleOf constraints.
• dependencies and dependentRequired dependency handling.
• Detailed error reporting, including paths and reasons.

📦 Installation

Install via npm:

npm install ajv

💻 Usage Examples

Basic Usage

const Ajv = require('ajv');
const ajv = new Ajv();
const schema = {
  type: 'object',
  properties: {
    name: { type: 'string' },
    age: { type: 'integer', minimum: 0 }
  }
};
const data = { name: "张三", age: 25 };
const validate = ajv.compile(schema);
const { valid, errors } = validate(data);
console.log(valid); // true

As an Express Middleware

app.use(ajv.jsonSchema());

📚 Documentation

Contribution Guide

All validation functions are generated through doT templates. The templates are pre - compiled, so doT is not a runtime dependency.

Build

npm run build

Watch

When files in the dot folder change, watch will automatically compile the templates:

npm run watch

Please refer to the Contribution Guide for more details.

Change History

Version 5.0.1 - beta

• Introduced a new validation engine, resulting in significant performance improvements.
• Added support for Draft7.

Version 4.6.0

• Improved the detail level of error reporting.
• Fixed some known issues.

Version 3.0.0

• Comprehensive upgrade, introducing new features and optimizations.

📄 License

This project is licensed under the MIT license. See LICENSE for details.