<aside class="note beta">
<h4>Early access:</h4>
<p>Additional address fields are in early access and available by request. To request access, contact <a href="https://help.shopify.com/support">Shopify Support</a>.</p>
</aside>

Merchants can enable additional address fields for shipping and billing addresses at checkout to comply with address standards in specific regions.

This guide introduces how to extract the additional field data from the standard address fields when [additional address fields](https://help.shopify.com/manual/markets/shipping-and-markets/international-considerations#additional-address) have been enabled by a merchant. Example extensions are provided for converting and updating extended address fields.

<figure class="figure"><img src="https://cdn.shopify.com/shopifycloud/shopify_dev/assets/apps/checkout/delivery-shipping/additional_address_fields/checkout-7b527dfe487275a38de855c3e5f827c6e685f0487c629fcdc4f44eb97d4b66db.png" class="lazyload" alt="The shipping address form in checkout with additional fields street name, house number, and neighborhood." width="1890" height="1488"></figure>

## How it works

When additional address fields are enabled, [supported countries](https://help.shopify.com/manual/markets/shipping-and-markets/international-considerations#additional-address) will offer an extended address form in checkout. Depending on the country, the extended address form:

- Replaces standard field `address1` with additional fields `streetName` and `streetNumber`
- Replaces standard field `address2` with additional fields `line2` and `neighborhood`

The data captured in the additional fields is merged back into the standard fields. The data is joined with the Unicode format character, [word joiner](https://en.wikipedia.org/wiki/Word_joiner), alongside regional decorators.

Shopify uses the [JavaScript](#javascript-clients) and [Ruby](#ruby-clients) libraries offered in the open source library [Worldwide](https://github.com/Shopify/worldwide) to parse the additional field data. We recommend that you use the same libraries in your app to ensure a consistent experience.

### JavaScript clients

Worldwide offers the parsing logic as an `npm` package [@shopify/worldwide](https://www.npmjs.com/package/@shopify/worldwide).

The `npm` package provides concatenation and splitting functions for both `address1` and `address2`:

- `concatenateAddress1`
- `concatenateAddress2`
- `splitAddress1`
- `splitAddress2`

The usage details are described in the [README](https://www.npmjs.com/package/@shopify/worldwide).

### Ruby clients

Worldwide offers the ruby class, [`Worldwide::Address`](https://github.com/Shopify/worldwide/blob/main/lib/worldwide/address.rb), which exposes the following public methods:

- `concatenate_address1`
- `concatenate_address2`
- `split_address1`
- `split_address2`

The usage details are described in the [README](https://github.com/Shopify/worldwide/blob/main/README.md).

## Requirements

- The additional address fields feature is enabled on the store.


- You've created a [Partner account](https://www.shopify.com/partners).
- You've created a [development store](/docs/api/development-stores#create-a-development-store-to-test-your-app).
- You've [created an app that uses Shopify CLI 3.49.5 or higher](/docs/apps/build/scaffold-app). If you previously installed Shopify CLI, then make sure that you're using the [latest version](/docs/api/shopify-cli#upgrade).
  
    If you plan to create a UI for your extension, then start with the [Remix app template](/docs/api#app-templates).
  
  
- You've installed [Node.js](https://nodejs.org/en/download) 16 or higher.
- You've [installed your app](/docs/apps/build/scaffold-app#step-3-install-your-app-on-your-development-store) on the development store.




### Rust-specific requirements

The following requirements are specific to Rust-based development with Shopify Functions.

- You've installed [Rust](https://www.rust-lang.org/tools/install).

    On Windows, Rust requires the [Microsoft C++ Build Tools](https://docs.microsoft.com/en-us/windows/dev-environment/rust/setup). Make sure to select the **Desktop development with C++** workload when installing the tools.

- You've installed the [`wasm32-wasip1` target](https://doc.rust-lang.org/rustc/platform-support/wasm32-wasip1.html):

    <p>
    <div class="react-code-block" data-preset="terminal">
    <div class="react-code-block-preload ThemeMode-dim">
    <div class="react-code-block-preload-bar "></div>
    <div class="react-code-block-preload-placeholder-container">
    <div class="react-code-block-preload-code-container">
    <div class="react-code-block-preload-codeline-number"></div>
    <div class="react-code-block-preload-codeline"></div>
    </div>

    </div>
    </div>


    <script type="text/plain" data-language="bash">
    RAW_MD_CONTENTrustup target add wasm32-wasip1
    END_RAW_MD_CONTENT</script>

    </div>
    </p>




## Example: Performing address validations on the extended address form

The following example checkout UI extension uses `splitAddress` and the [Cart and Checkout Validation API](/docs/api/functions/reference/cart-checkout-validation/graphql) to block checkout and render an error message when the street number and neighborhood in Brazil do not meet defined conditions:

<p>
<div class="react-code-block" data-preset="basic">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar basic-codeblock"></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
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</div>

</div>
</div>


<script type="text/plain" data-language="js" data-title="JavaScript">
RAW_MD_CONTENTimport React from "react";
import {
  reactExtension,
  useBuyerJourneyIntercept,
  useShippingAddress,
} from "@shopify/ui-extensions-react/checkout";
import { splitAddress1, splitAddress2 } from '@shopify/worldwide';

reactExtension("purchase.checkout.delivery-address.render-before", () => <Extension />);

export default function Extension() {
  const address = useShippingAddress();

  const countryCode = address?.countryCode;

  // 1. Read standard address fields values
  const address1 = address?.address1;
  const address2 = address?.address2;
  const errors = [];

  useBuyerJourneyIntercept(({ canBlockProgress }) => {
    if (canBlockProgress && countryCode === "BR") {
      if (address1) {

        // 2. Get additional address field values from address1 using the @shopify/worldwide library
        const additionalFieldsAddress1 = splitAddress1(countryCode, address1);

        if (additionalFieldsAddress1) {
          const { streetNumber } = additionalFieldsAddress1;
          if (streetNumber && streetNumber === '1001') {
            errors.push({
              message: "We don't deliver to street number 1001",
              target: "$.cart.deliveryGroups[0].deliveryAddress.address1"
            });
          }
        }
      }

      if (address2) {

        // 3. Get additional address field values from address2 using the @shopify/worldwide library
        const additionalFieldsAddress2 = splitAddress2(countryCode, address2);

        if (additionalFieldsAddress2) {
          const { neighborhood } = additionalFieldsAddress2;
          if (neighborhood && neighborhood === 'Undeliverablehood') {
            errors.push({
              message: "We don't deliver to undeliverablehood",
              target: "$.cart.deliveryGroups[0].deliveryAddress.address2"
            });
          }
        }
      }
      return {
        behavior: "block",
        reason: "Invalid shipping address",
        errors: errors,
      };
    }

    return {
      behavior: "allow"
    };
  });

  return null;
}
END_RAW_MD_CONTENT</script>

</div>
</p>


## Example: Updating addresses when additional address fields are enabled

The following example checkout UI extension uses `concatenatedAddress` and `useApplyShippingAddressChange` to convert the extended address fields into the standard address fields and updates the standard address fields `address1` and `address2`:

<p>
<div class="react-code-block" data-preset="basic">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar basic-codeblock"></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
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<div class="react-code-block-preload-codeline"></div>
</div>
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</div>
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<script type="text/plain" data-language="js" data-title="JavaScript">
RAW_MD_CONTENTimport React, { useEffect } from "react";
import {
  reactExtension,
  useShippingAddress,
  useApplyShippingAddressChange,
} from "@shopify/ui-extensions-react/checkout";
import { concatenateAddress1, concatenateAddress2 } from '@shopify/worldwide';

export default reactExtension(
  'purchase.checkout.block.render',
  () => <Extension />,
);

function Extension() {
  const address = useShippingAddress();

  const applyShippingAddressChange = useApplyShippingAddressChange();

  // 1. Generate address1 value from additional address fields
  const updatedAddress1 = concatenateAddress1({
    countryCode: 'BR',
    streetName: 'Av. Paulista',
    streetNumber: '1578',
  });

  // 2. Generate address2 value from additional address fields
  const updatedAddress2 = concatenateAddress2({
    countryCode: 'BR',
    line2: 'apartamento 42',
    neighborhood: 'Centro',
  });

  const firstName = address?.firstName;

  useEffect(() => {
    const newAddress = {
      lastName: 'Paulo',
      address1: updatedAddress1,
      address2: updatedAddress2,
    }

    if (firstName === "Pedro") {
      applyShippingAddressChange({
        type: 'updateShippingAddress',
        address: newAddress,
      });
    }
  }, [applyShippingAddressChange, firstName, updatedAddress1, updatedAddress2]);

  return null;
}
END_RAW_MD_CONTENT</script>

</div>
</p>