nodejs class-validator validating array of objects

Question

I have a array of objects that looks like this

[{
  name: 'some name'
  catId: 2,
}, {
  name: 'another name'
  catId: 3,
}]

How can I validate using class-validator so that the name field is required and minimum 2 chars long in each object?

Thanks

This was helpful for me stackoverflow.com/questions/58343262/… — frederj
– frederj, Commented Dec 21, 2020 at 17:05

NoNameProvided · Accepted Answer · 2018-03-17 19:16:06Z

6

To validate an array of items, you need to use @ValidateNested({ each: true }).

A complete example:

import { validate, IsString, MinLength, ValidateNested } from 'class-validator';

class MySubClass {
  @IsString()
  @MinLength(2)
  public name: string;

  constructor(name: string ){
    this.name = name;
  }
}

class WrapperClass {
  @ValidateNested({ each: true })
  public list: MySubClass[];

  constructor(list: MySubClass[]) {
    this.list = list;
  }
}

const subClasses = Array(4)
    .fill(null)
    .map(x => new MySubClass('Test'))

subClasses[2].name = null;

const wrapperClass = new WrapperClass(subClasses);
const validationErrors = await validate(wrapperClass);

This will log a validation error for subClasses[2] as expected.

answered Mar 17, 2018 at 19:16

NoNameProvided

9,0179 gold badges47 silver badges74 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

nodejs class-validator validating array of objects

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related