Vue request fails but does not log errors

I have this add method in my vue script

if (this.edit === false) {
     this.link.link = submitEvent.target.elements.link.value;
     fetch('products', {
          method: 'POST',
          body: JSON.stringify(this.link),
          headers: {
             'content-type': 'application/json'
          }
       })
       .then(res => res.json())
       .then(res => {                    // this does not get executed
             this.qrcode.redirect_url = ""; 
             alert('Added');
             this.fetchAll()
       })
      .catch(err => console.log(err.res));
   }
}

When I fill the form the request is send and entry is made to the database but I do not get response. I am using laravel as backend and Add method in Controller returns 200 response after creation. What could cause it and why console.log(err) does not not display anything?

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