if (tags[0].length === 0) {
      resp = [200, { message: `article already tagged as ${tags[1].join(', ')}`, data: tags[2] }];
    } else if (tags[1].length === 0) {
      resp = [201, { message: `article tagged as ${tags[0].join(', ')}`, data: tags[2] }];
    } else {