How can I perform data validation in different programming languages?

How can I perform data validation in different programming languages?

Data validation can vary by language. Which languages are you interested in?

I'm mainly looking at Python, JavaScript, and Java.

In Python, you can use libraries like pydantic or marshmallow. For JavaScript, consider using Joi or Yup. In Java, you might use Hibernate Validator.

Can you give me a simple example for each?

Sure! In Python with pydantic, you can define a model and validate data like this: from pydantic import BaseModel; class User(BaseModel): name: str; age: int. In JavaScript with Joi, it looks like: const schema = Joi.object({ name: Joi.string().required(), age: Joi.number().integer().required() });. For Java, you can use annotations like @NotNull and @Size in your model class.