If you failed validation using class-validator, you'll be received messages. But it is very difficult to read. This library modifies the message to make it easier to handle.
$ npm install --save class-validator-message-formatterclass User {
@IsString()
name: string;
@IsString()
address: string;
constructor(name: string, address: string) {
this.name = name;
this.address = address;
}
}Without class-validator-message-formatter
import { validateSync } from 'class-validator';
const user:User = new User();
const errors = validateSync(user);
console.log(errors); [ ValidationError {
target: User { name: null, address: null },
value: null,
property: 'name',
children: [],
constraints: { isString: 'name must be a string' } },
ValidationError {
target: User { name: null, address: null },
value: null,
property: 'address',
children: [],
constraints: { isString: 'address must be a string' } } ]with class-validator-message-formatter
import {MessageFormatter} from 'class-validator-message-formatter';
import { validateSync } from 'class-validator';
const user:User = new User();
const errors = validateSync(user);
console.log(MessageFormatter.format(errors));[ { field: 'name', message: 'name must be a string' },
{ field: 'address', message: 'address must be a string' } ]
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