Has !

// In some script
if (!has(['username', 'password'], req.body) {
  // console.log('Request body: <username> and <password> are required')
}

// Function in file: has.ts
export const NOT_EMPTY = true

export function has(thoseKeys: Array<string>, object: any, cantBeEmpty: boolean = false)
{
    let isValid = true

    for (let key of thoseKeys) {
        if (!object.hasOwnProperty(key)) {
            isValid = false
            break
        }

        if (cantBeEmpty && (object[key] === null || object[key] === '') || object[key] === 'undefined' || object[key] === undefined) {
            isValid = false
            break
        }
    }
    
    return isValid
}