How do I validate nested objects using express-validator?

How do I validate nested objects using express-validator?

You can validate nested objects in express-validator by using the body method along with the isObject and custom validators.

Can you show me an example of how to do that?

Sure! Here's a simple example:

const { body } = require('express-validator');

app.post('/user', [
  body('address').isObject().withMessage('Address must be an object'),
  body('address.street').isString().withMessage('Street must be a string'),
  body('address.city').isString().withMessage('City must be a string')
], (req, res) => {
  // Handle the request
});

What if I want to validate arrays of nested objects?

You can use the body method with isArray and custom validators to validate arrays of nested objects. Here's an example:

app.post('/users', [
  body('users').isArray().withMessage('Users must be an array'),
  body('users.*.name').isString().withMessage('Each user must have a name'),
  body('users.*.age').isInt().withMessage('Each user must have an age')
], (req, res) => {
  // Handle the request
});