Square TypeScript Library

The Square TypeScript library provides convenient access to the Square API from TypeScript.

Installation

npm i -s square

Reference

A full reference for this library is available here.

Versioning

By default, the SDK is pinned to the latest version. If you would like to override this version you can simply pass in a request option.

await client.payments.create(..., {
    version: "2024-05-04" // override the version used
})

Usage

Instantiate and use the client with the following:

import { SquareClient } from "square";

const client = new SquareClient({ token: "YOUR_TOKEN" });
await client.payments.create({
    sourceId: "ccof:GaJGNaZa8x4OgDJn4GB",
    idempotencyKey: "7b0f3ec5-086a-4871-8f13-3c81b3875218",
    amountMoney: {
        amount: BigInt(1000),
        currency: "USD",
    },
    appFeeMoney: {
        amount: BigInt(10),
        currency: "USD",
    },
    autocomplete: true,
    customerId: "W92WH6P11H4Z77CTET0RNTGFW8",
    locationId: "L88917AVBK2S5",
    referenceId: "123456",
    note: "Brief description",
});

Legacy SDK

If you're using TypeScript, make sure that the moduleResolution setting in your tsconfig.json is equal to node16, nodenext, or bundler to consume the legacy SDK.

While the new SDK has a lot of improvements, we at Square understand that it takes time to upgrade when there are breaking changes. To make the migration easier, the new SDK also exports the legacy SDK as square/legacy. Here's an example of how you can use the legacy SDK alongside the new SDK inside a single file:

import { randomUUID } from "crypto";
import { Square, SquareClient } from "square";
import { Client } from "square/legacy";

const client = new SquareClient({
  token: process.env.SQUARE_ACCESS_TOKEN,
});

const legacyClient = new Client({
  bearerAuthCredentials: {
    accessToken: process.env.SQUARE_ACCESS_TOKEN!,
  },
});

async function getLocation(): Promise<Square.Location> {
  return (
    await client.locations.get({
      locationId: "YOUR_LOCATION_ID",
    })
  ).location!;
}

async function createOrder() {
  const location = await getLocation();
  await legacyClient.ordersApi.createOrder({
    idempotencyKey: randomUUID(),
    order: {
      locationId: location.id!,
      lineItems: [
        {
          name: "New Item",
          quantity: "1",
          basePriceMoney: {
            amount: BigInt(100),
            currency: "USD",
          },
        },
      ],
    },
  });
}

createOrder();

We recommend migrating to the new SDK using the following steps:

1. Upgrade the NPM module to ^40.0.0
2. Search and replace all requires and imports from "square" to "square/legacy"

• For required, replace require("square") with require("square/legacy")
• For imports, replace from "square" with from "square/legacy"
• For dynamic imports, replace import("square") with import("square/legacy")

3. Gradually move over to use the new SDK by importing it from the "square" import.

Request And Response Types

The SDK exports all request and response types as TypeScript interfaces. Simply import them with the following namespace:

import { Square } from "square";

const request: Square.CreateMobileAuthorizationCodeRequest = {
    ...
};

Exception Handling

When the API returns a non-success status code (4xx or 5xx response), a subclass of the following error will be thrown.

import { SquareError } from "square";

try {
    await client.payments.create(...);
} catch (err) {
    if (err instanceof SquareError) {
        console.log(err.statusCode);
        console.log(err.message);
        console.log(err.body);
    }
}

Pagination

List endpoints are paginated. The SDK provides an iterator so that you can simply loop over the items:

import { SquareClient } from "square";

const client = new SquareClient({ token: "YOUR_TOKEN" });
const response = await client.bankAccounts.list();
for await (const item of response) {
    console.log(item);
}

// Or you can manually iterate page-by-page
const page = await client.bankAccounts.list();
while (page.hasNextPage()) {
    page = page.getNextPage();
}

Webhook Signature Verification

The SDK provides utility methods that allow you to verify webhook signatures and ensure that all webhook events originate from Square. The Webhooks.verifySignature method will verify the signature.

import { WebhooksHelper } from "square";

const isValid = WebhooksHelper.verifySignature({
  requestBody,
  signatureHeader: request.headers['x-square-hmacsha256-signature'],
  signatureKey: "YOUR_SIGNATURE_KEY",
  notificationUrl: "https://example.com/webhook", // The URL where event notifications are sent.
});

Advanced

Additional Headers

If you would like to send additional headers as part of the request, use the headers request option.

const response = await client.payments.create(..., {
    headers: {
        'X-Custom-Header': 'custom value'
    }
});

Retries

The SDK is instrumented with automatic retries with exponential backoff. A request will be retried as long as the request is deemed retriable and the number of retry attempts has not grown larger than the configured retry limit (default: 2).

A request is deemed retriable when any of the following HTTP status codes is returned:

• 408 (Timeout)
• 429 (Too Many Requests)
• 5XX (Internal Server Errors)

Use the maxRetries request option to configure this behavior.

const response = await client.payments.create(..., {
    maxRetries: 0 // override maxRetries at the request level
});

Timeouts

The SDK defaults to a 60 second timeout. Use the timeoutInSeconds option to configure this behavior.

const response = await client.payments.create(..., {
    timeoutInSeconds: 30 // override timeout to 30s
});

Aborting Requests

The SDK allows users to abort requests at any point by passing in an abort signal.

const controller = new AbortController();
const response = await client.payments.create(..., {
    abortSignal: controller.signal
});
controller.abort(); // aborts the request

Runtime Compatibility

The SDK defaults to node-fetch but will use the global fetch client if present. The SDK works in the following runtimes:

• Node.js 18+
• Vercel
• Cloudflare Workers
• Deno v1.25+
• Bun 1.0+
• React Native

Customizing Fetch Client

The SDK provides a way for your to customize the underlying HTTP client / Fetch function. If you're running in an unsupported environment, this provides a way for you to break glass and ensure the SDK works.

import { SquareClient } from "square";

const client = new SquareClient({
    ...
    fetcher: // provide your implementation here
});

Contributing

While we value open-source contributions to this SDK, this library is generated programmatically. Additions made directly to this library would have to be moved over to our generation code, otherwise they would be overwritten upon the next generated release. Feel free to open a PR as a proof of concept, but know that we will not be able to merge it as-is. We suggest opening an issue first to discuss with us!

On the other hand, contributions to the README are always very welcome!