What are some examples of schema validation in different programming languages?

What are some examples of schema validation in different programming languages?

Schema validation is a way to ensure that data conforms to a defined structure. In languages like JavaScript, you can use libraries like Joi or Ajv. In Python, you might use Pydantic or Marshmallow. Would you like examples for a specific language?

Yes, can you show me an example in Python?

Sure! Here's a simple example using Pydantic:

from pydantic import BaseModel

class User(BaseModel):
    id: int
    name: str
    email: str

user = User(id=1, name='John Doe', email='[email protected]')
print(user)

This will validate the data types of the fields when creating a User instance.

What about JavaScript?

In JavaScript, using Joi, you can validate an object like this:

const Joi = require('joi');

const schema = Joi.object({
    id: Joi.number().integer().required(),
    name: Joi.string().required(),
    email: Joi.string().email().required()
});

const { error, value } = schema.validate({ id: 1, name: 'John Doe', email: '[email protected]' });
if (error) {
    console.error(error.details);
} else {
    console.log(value);
}

This checks that the data matches the schema.