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Smarty JavaScript SDK

The official JavaScript/TypeScript SDK for accessing Smarty address validation APIs. Works in both Node.js and browser environments.

Installation

npm install smartystreets-javascript-sdk

Quick Start: US Street Address Validation

import SmartySDK from "smartystreets-javascript-sdk";

const credentials = new SmartySDK.core.StaticCredentials(
  process.env.SMARTY_AUTH_ID,
  process.env.SMARTY_AUTH_TOKEN,
);
const client = new SmartySDK.core.ClientBuilder(credentials).buildUsStreetApiClient();

const lookup = new SmartySDK.usStreet.Lookup();
lookup.street = "1600 Amphitheatre Parkway";
lookup.city = "Mountain View";
lookup.state = "CA";

const response = await client.send(lookup);
console.log(response.lookups[0].result);

Quick Start: US Autocomplete Pro

const client = new SmartySDK.core.ClientBuilder(credentials).buildUsAutocompleteProClient();

const lookup = new SmartySDK.usAutocompletePro.Lookup("4770 Lincoln");
lookup.maxResults = 10;
lookup.preferStates = ["IL"];

const response = await client.send(lookup);
console.log(response.result); // Array of address suggestions

Supported APIs

| API | Module | Build Method | Example | | --- | --- | --- | --- | | US Street | usStreet | buildUsStreetApiClient() | example | | US Zipcode | usZipcode | buildUsZipcodeClient() | example | | US Autocomplete Pro | usAutocompletePro | buildUsAutocompleteProClient() | example | | US Extract | usExtract | buildUsExtractClient() | example | | US Enrichment | usEnrichment | buildUsEnrichmentClient() | example | | US Reverse Geocoding | usReverseGeo | buildUsReverseGeoClient() | example | | International Street | internationalStreet | buildInternationalStreetClient() | example | | International Autocomplete | internationalAddressAutocomplete | buildInternationalAddressAutocompleteClient() | example | | International Postal Code | internationalPostalCode | buildInternationalPostalCodeClient() | example |

Authentication

Three credential types are available:

• StaticCredentials(authId, authToken) — Server-side authentication using auth-id and auth-token.
• SharedCredentials(key) — Client-side (browser) authentication using an embedded key. Does not support batch (POST) requests.
• BasicAuthCredentials(authId, authToken) — HTTP Basic Auth.

Common Patterns

Batch Requests

Send up to 100 lookups in a single request (not available with SharedCredentials):

const batch = new SmartySDK.core.Batch();
batch.add(lookup1);
batch.add(lookup2);

const response = await client.send(batch);

Error Handling

All API errors extend SmartyError:

import { SmartyError } from "smartystreets-javascript-sdk";

try {
  const response = await client.send(lookup);
} catch (err) {
  if (err instanceof SmartyError) {
    console.error("API error:", err.message);
  }
}

Retry and Timeout

const client = new SmartySDK.core.ClientBuilder(credentials)
  .withMaxRetries(10)
  .withMaxTimeout(30000)
  .buildUsStreetApiClient();

Proxy

const client = new SmartySDK.core.ClientBuilder(credentials)
  .withProxy("proxy.example.com", 8080, "https")
  .buildUsStreetApiClient();

Custom Headers

const client = new SmartySDK.core.ClientBuilder(credentials)
  .withCustomHeaders({ "X-Custom-Header": "value" })
  .buildUsStreetApiClient();

TypeScript

The SDK is written in TypeScript and ships with full type declarations — no @types/ package needed. All types are available as named exports:

import SmartySDK, { type MatchStrategy, type SmartyError } from "smartystreets-javascript-sdk";

const lookup = new SmartySDK.usStreet.Lookup();
lookup.street = "1600 Amphitheatre Parkway";
lookup.match = "enhanced" satisfies MatchStrategy;

JavaScript users benefit too — editors like VS Code automatically pick up the bundled type declarations, providing autocompletion and hover docs with no configuration.

See UPGRADING.md for details on migrating from the previous JavaScript-only release.

Documentation

Full API documentation is available at smarty.com/docs/sdk/javascript.

License

Apache 2.0