How to Validate JSON Schema ?

Validating JSON schema ensures that the structure and data types within a JSON document adhere to a predefined schema. This process is crucial for ensuring data consistency and integrity in applications where JSON data is exchanged.

Import the Ajv Library, a popular JSON Schema validator for JavaScript.
A JSON schema is defined with specific properties and their corresponding types. Additionally, required fields are specified. Then, sample data is created adhering to the defined schema.
Initializing Ajv, An instance of Ajv is initialized, allowing us to use its functionalities.
The defined schema is compiled using Ajv’s “compile()” method, resulting in a validation function.
The compiled schema validation function is used to validate the sample data. If the data conforms to the schema, a success message is logged; otherwise, validation errors are logged.

Initialize npm in your project directory.

npm init -y

Install the Ajv library using npm.

npm install ajv

Project structure:

Example: The example below shows how to Validate JSON Schema.

JavaScript

const Ajv = require("ajv");

// Define schema and data
const schema = {
    type: "object",
    properties: {
        name: { type: "string" },
        age: { type: "number" }
    },
    required: ["name", "age"]
};

const data = {
    name: "John Doe",
    age: 30
};

// Initialize Ajv
const ajv = new Ajv();

// Compile schema
const validate = ajv.compile(schema);

// Validate data
const isValid = validate(data);

if (isValid) {
    console.log("Validation successful");
} else {
    console.log("Validation failed:", validate.errors);
}

Run the JavaScript file using Node.js.

node validate.js

Output:

validation successful

Approach

Steps to Create Application

Project structure:

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