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Create a new project

Create a new directory and initialize a new npm package. 
mkdir formance-js-example
cd formance-js-example
npm init -y
Depending on the language you want to use, setup TypeScript.
Install TypeScript and the Node.js type definitions.
npm install --save-dev typescript @types/node ts-node
npx tsc --init

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Install the Formance SDK

Next install the Formance SDK as well as the Formance OAuth helper. 
npm install --save @formance/formance-sdk
The Formance API relies on OAuth 2.0 for authentication.The Formance OAuth helper simplifies the OAuth flow and provides a simple interface to obtain an access token using the client_credentials grant type.For more information, see OAuth 2.0.
The Formance OAuth helper uses the client_credentials grant type, which requires a client ID and client secret. These are sensitive credentials that should not be exposed to the public.If you’re integrating Formance into a web application, you should use an OAuth flow that does not require a client secret, such as the authorization code grant.

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Hello World from the Formance Ledger

Create a new file index.ts and add the following code. Replace the endpoint, client ID and client secret with your own values.
import { SDK as Formance } from '@formance/formance-sdk';

const ENDPOINT = "https://xxxxxxxxxx-xxxx.sandbox.formance.cloud";

const formance = new Formance({
    serverURL: ENDPOINT,
    security: {
        clientID: "RANDOM_KEY",
        clientSecret: "RANDOM_KEY",
    }
});

async function main() {
    const ledgerInfo = await formance.ledger.getInfo();
    console.log(ledgerInfo.configInfoResponse!.data);
}

main();
You’ll need the API endpoint and the credentials created during the SDK’s Getting Started guide. If you don’t have them, you can create them by following the guide.
Next, run the file using ts-node.
npx ts-node index.ts
You should see a similar output. 
{
  config: { storage: { driver: 'postgres', ledgers: [Array] } },
  server: 'numary-ledger',
  version: 'v1.10.13'
}
Numary is the Formance’s former name.