APIs must ensure that incoming data is properly structured and secure. Payload validation helps prevent incorrect data from being processed. In Node.js, the Joi library simplifies validation by allowing developers to define schemas.
Example: Validating a User Registration Payload with Joi
const Joi = require(“joi”);
// Define a validation schema
const userSchema = Joi.object({
name: Joi.string().min(3).required(),
email: Joi.string().email().required(),
age: Joi.number().min(18).required(),
});
// Sample payload to validate
const payload = {
name: “John Doe”,
email: “john.doe@example.com”,
age: 25,
};
const { error } = userSchema.validate(payload);
if (error) {
console.log(“Validation Error:”, error.details);
} else {
console.log(“Payload is valid”);
}
Why Use Payload Validation?
- Ensures required fields are present.
- Verifies that values follow the expected format.
- Prevents invalid or malicious data from affecting the system.
Payload validation is a best practice that enhances API reliability and security.