Question 1

How to validate nested objects in property-validator?

Accepted Answer

Use dot notation in property names, like 'user.email', for nested fields in request bodies, as shown in the body validation example. For more complex nesting, custom validation functions might be needed.

Question 2

property-validator vs Joi: which is better for Express?

Accepted Answer

Property-validator is simpler and stateless, ideal for lightweight request validation with minimal setup. Joi offers more features like schema validation and is better for complex data structures, but property-validator integrates seamlessly with Express middleware.

Question 3

How to create a custom validation rule in property-validator?

Accepted Answer

Write a function that returns an object with result, message, and field properties, as demonstrated in the custom validation functions section. You can then use it like any built-in helper in your validation arrays.

Question 4

Does property-validator support TypeScript projects?

Accepted Answer

Yes, it ships with built-in TypeScript definitions, so no additional type packages are required. This ensures type safety and autocompletion in editors for validation functions.

Question 5

How to handle validation errors in Express middleware with property-validator?

Accepted Answer

Use the assert functions with the built-in assertMiddleware to automatically catch and respond with errors, or roll your own middleware by checking for ValidationError instances, as detailed in the README.

Question 6

Can I use property-validator for client-side JavaScript?

Accepted Answer

It's primarily designed for Node.js and Express, but since it's built on validator.js, it can run in any JavaScript environment. However, the request-specific functions like validateParams are server-side focused.

property-validator

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