What are the best validator libraries for TypeScript?

What are the best validator libraries for TypeScript?

Some popular validator libraries for TypeScript include Joi, Yup, and class-validator. Each has its own strengths.

Can you explain how to use Yup with TypeScript?

Sure! You can define a schema using Yup and then validate your data against it. Here's a simple example:

import * as Yup from 'yup';

const schema = Yup.object().shape({
  name: Yup.string().required(),
  age: Yup.number().required().positive().integer(),
});

schema.validate({ name: 'John', age: 30 })
  .then(function(value) {
    console.log('Valid!', value);
  })
  .catch(function(err) {
    console.log('Validation error:', err);
  });

What about class-validator? How does it differ from Yup?

class-validator is more focused on class-based validation, using decorators to define validation rules directly on class properties. This can be more intuitive in TypeScript.

Are there any performance considerations when using these libraries?

Yes, performance can vary based on the complexity of your validation schemas and the size of the data being validated. It's best to benchmark in your specific use case.