Modern Treasury Node API Library

The Modern Treasury Node library provides convenient access to the Modern Treasury REST API from applications written in server-side JavaScript. It includes TypeScript definitions for all request params and response fields.

Documentation

The API documentation can be found here.

Installation

npm install --save modern-treasury
# or
yarn add modern-treasury

Usage

import ModernTreasury from 'modern-treasury';

const modernTreasury = new ModernTreasury({
  apiKey: 'my api key', // defaults to process.env["MODERN_TREASURY_API_KEY"]
  organizationId: 'my-organization-ID',
});

async function main() {
  const externalAccount = await modernTreasury.externalAccounts.create({
    counterparty_id: '9eba513a-53fd-4d6d-ad52-ccce122ab92a',
    name: 'my bank',
  });

  console.log(externalAccount.id);
}
main().catch(console.error);

Usage with TypeScript

Importing, instantiating, and interacting with the library are the same as above. If you like, you may reference our types directly:

import ModernTreasury from 'modern-treasury';

const modernTreasury = new ModernTreasury({
  apiKey: 'my api key', // defaults to process.env["MODERN_TREASURY_API_KEY"]
  organizationId: 'my-organization-ID',
});

async function main() {
  const params: ModernTreasury.ExternalAccountCreateParams = {
    counterparty_id: '9eba513a-53fd-4d6d-ad52-ccce122ab92a',
    name: 'my bank',
  };
  const externalAccount: ModernTreasury.ExternalAccount = await modernTreasury.externalAccounts.create(
    params,
  );
}
main().catch(console.error);

Documentation for each method, request param, and response field are available in docstrings and will appear on hover in most modern editors.

File Uploads

Request parameters that correspond to file uploads can be passed as either a FormData.Blob or a FormData.File instance.

We provide a fileFromPath helper function to easily create FormData.File instances from a given class.

import ModernTreasury, { fileFromPath } from 'modern-treasury';

const modernTreasury = new ModernTreasury();

const file = await fileFromPath('/my/file.txt');
await modernTreasury.documents.create('counterparties', '24c6b7a3-02...', { file: file });

Handling errors

When the library is unable to connect to the API, or if the API returns a non-success status code (i.e., 4xx or 5xx response), a subclass of APIError will be thrown:

async function main() {
  const externalAccount = await modernTreasury.externalAccounts
    .create({ counterparty_id: 'missing' })
    .catch((err) => {
      if (err instanceof ModernTreasury.APIError) {
        console.log(err.status); // 400
        console.log(err.name); // BadRequestError

        console.log(err.headers); // {server: 'nginx', ...}
      }
    });
}
main().catch(console.error);

Error codes are as followed:

Status Code	Error Type
400	BadRequestError
401	AuthenticationError
403	PermissionDeniedError
404	NotFoundError
422	UnprocessableEntityError
429	RateLimitError
>=500	InternalServerError
N/A	APIConnectionError

Retries

Certain errors will be automatically retried 2 times by default, with a short exponential backoff. Connection errors (for example, due to a network connectivity problem), 409 Conflict, 429 Rate Limit, and >=500 Internal errors will all be retried by default.

You can use the maxRetries option to configure or disable this:

// Configure the default for all requests:
const modernTreasury = new ModernTreasury({
  maxRetries: 0, // default is 2
  organizationId: 'my-organization-ID',
});

// Or, configure per-request:
modernTreasury.externalAccounts.list({
  maxRetries: 5,
});

Timeouts

Requests time out after 60 seconds by default. You can configure this with a timeout option:

// Configure the default for all requests:
const modernTreasury = new ModernTreasury({
  timeout: 20 * 1000, // 20 seconds (default is 60s)
  organizationId: 'my-organization-ID',
});

// Override per-request:
modernTreasury.externalAccounts.list({ party_name: 'my bank' }, {
  timeout: 5 * 1000,
});

On timeout, an APIConnectionTimeoutError is thrown.

Note that requests which time out will be retried twice by default.

Auto-pagination

List methods in the ModernTreasury API are paginated. You can use for await … of syntax to iterate through items across all pages:

async function fetchAllExternalAccounts(params) {
  const allExternalAccounts = [];
  // Automatically fetches more pages as needed.
  for await (const externalAccount of modernTreasury.externalAccounts.list()) {
    allExternalAccounts.push(externalAccount);
  }
  return allExternalAccounts;
}

Alternatively, you can make request a single page at a time:

let page = await modernTreasury.externalAccounts.list();
for (const externalAccount of page.items) {
  console.log(externalAccount);
}

// Convenience methods are provided for manually paginating:
while (page.hasNextPage()) {
  page = page.getNextPage();
  // ...
}

Configuring an HTTP(S) Agent (e.g., for proxies)

By default, this library uses a stable agent for all http/https requests to reuse TCP connections, eliminating many TCP & TLS handshakes and shaving around 100ms off most requests.

If you would like to disable or customize this behavior, for example to use the API behind a proxy, you can pass an httpAgent which is used for all requests (be they http or https), for example:

import http from 'http';
import HttpsProxyAgent from 'https-proxy-agent';

// Configure the default for all requests:
const modernTreasury = new ModernTreasury({
  httpAgent: new HttpsProxyAgent(process.env.PROXY_URL),
  organizationId: 'my-organization-ID',
});

// Override per-request:
modernTreasury.externalAccounts.list({
  baseURL: 'http://localhost:8080/test-api',
  httpAgent: new http.Agent({ keepAlive: false }),
})

Status

This package is in beta. Its internals and interfaces are not stable and subject to change without a major semver bump; please reach out if you rely on any undocumented behavior.

We are keen for your feedback; please email us at [email protected] or open an issue with questions, bugs, or suggestions.

Requirements

The following runtimes are supported:

• Node.js version 12 or higher.
• Deno v1.28.0 or higher (experimental). Use import ModernTreasury from "npm:modern-treasury".

If you are interested in other runtime environments, please open or upvote an issue on GitHub.