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HTML 

              
                <div class="container">
  <h3>ZIPCODA Example</h3>
  <form id="fm-address">
    <div class="row section-address">
      <div class="col">
        <input id="prefecture" class="form-control" type="text" placeholder="都道府県" />
      </div>
      <div class="col">
        <input id="city" class="form-control" type="text" placeholder="市区" />
      </div>
      <div class="col">
        <input id="address" class="form-control" type="text" placeholder="住所" />
      </div>
      <div class="col">
        <input id="other" class="form-control" type="text" placeholder="建物等" />
      </div>
    </div>
    <div class="row mt-2 mb-2">
      <div class="col">
        <a id="to-zip" class="btn btn-primary" href="javascript:void(0);">住所から郵便番号へ</a>
        <a class="btn btn-secondary" id="to-addr" href="javascript:void(0);">郵便番号から住所へ</a>
      </div>
    </div>
    <div class="row section-zipcode">
      <div class="col">
        <input id="zip" class="form-control" type="text" placeholder="郵便番号" />
      </div>
    </div>
  </form>
</div>
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CSS
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JS 

              
                $(document).ready(function () {
  $("#to-zip").on("click", function () {
    const pref = $("input#prefecture").val();
    const city = $("input#city").val();
    const addr = $("input#address").val();

    const address = pref + city + addr;

    $.ajax({
      url: "https://zipcoda.net/api",
      dataType: "jsonp",
      data: {
        address: address
      }
    }).then((data) => {
      const zip = data.items[0].zipcode;
      $("input#zip").val(zip);
    });
  });

  $("#to-addr").on("click", function () {

    const zip = $("input#zip").val();

    $.ajax({
      url: "https://zipcoda.net/api",
      dataType: "jsonp",
      data: {
        zipcode: zip
      }
    }).then((data) => {
      const pref = data.items[0].components[0];
      const city = data.items[0].components[1];
      const addr = data.items[0].components[2];
      $("input#prefecture").val(pref);
      $("input#city").val(city);
      $("input#address").val(addr);
    });

  });
});
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999px

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