楽天市場商品検索APIで任意のキーワードの商品一覧を表示

<ul id="rakutenItem"></ul>

(async () => {
  const url = "ここにAPIのアドレス";
  const res = await fetch(url);
  let json;
  try {
    if (res.ok) {
      json = await res.json();
      let allItem = "";
      for (let i = 0; i < json.Items.length; i++) {
        const product = json.Items[i].Item;
        const productLink = product.itemUrl;
        const productImage = product.mediumImageUrls[0].imageUrl;
        const productName = product.itemName;
        const shopName = product.shopName;
        const productPrice = product.itemPrice.toLocaleString();
        let allItemParts =
          `<li><a href="` +
          productLink +
          `" target="_blank" class="productLink link-` +
          (i + 1) +
          `">
          <img src="` +
          productImage +
          `" alt="` +
          productName +
          `" class="productImage">
          <div class="shopname">`
          + shopName + `</div>
          <p class="productName">` +
          productName +
          `</p>
          <p class="productPrice">` +
          productPrice +
          `<span>円</span></p>
          </a></li>`;
        allItem += allItemParts;
      }
      document.getElementById("rakutenItem").innerHTML = allItem;
    } else {
      throw new Error(res.status);
    }
  } catch (e) {
    console.error(e);
  }
})();

ul#rakutenItem {
    list-style: none;
    padding: 0;
    border: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 20px;
    margin: 0;
}
ul#rakutenItem li {
    width: calc(33% - 20px);
}
ul#rakutenItem li a {
    border-radius: 2px;
    background: #fff;
    box-shadow: 0 0 3px 0 rgb(0 0 0 / 12%), 0 2px 3px 0 rgb(0 0 0 / 22%);
    cursor: pointer;
    transition: 0.2s ease-in-out;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    height: 100%;
    padding-bottom: 12px;
    position: relative;
}
ul#rakutenItem li a:hover {
    box-shadow: 0 15px 30px -5px rgb(0 0 0 / 15%), 0 0 5px rgb(0 0 0 / 10%);
    transform: translateY(-4px);
}

ul#rakutenItem p {
    color: #313131;
    margin: 0;
}

/* 画像 */
ul#rakutenItem li a img {
    height: 200px;
    object-fit: cover;
    margin-bottom: 15px;
    border-radius: 3px 3px 0 0;
}
/* ショップ名 */
.shopname {
    padding-left: 15px;
    font-size: 0.7rem;
    color: #707070;
}
/* 商品名 */
p.productName {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
    flex-grow: 1;
    padding-left: 15px;
    padding-right: 15px;
    line-height: 1.5;
}

/* 価格 */
p.productPrice {
    font-family: Speedee, メイリオ, Meiryo, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
    font-weight: 800;
    font-size: 1.6rem;
    letter-spacing: -0.02rem;
    padding-left: 15px;
    padding-right: 10px;
    text-align: right;
    color: #D80C18 !important;
}
p.productPrice span {
    font-size: 1rem;
    margin-left: 3px;
    font-weight: 300;
}

@media screen and (max-width: 767px) {
/* （ここにモバイル用スタイルを記述） */
  ul#rakutenItem li {
      width: 100%;
  }
}