Checkeeper Client

A zero-dependency node client for the Checkeeper API.

Requirements

• Node 20+
• ESM-only: The client must be imported using import or dynamic import()

Usage

Create Check API

import { Configuration, CheckeeperClient } from "checkeeper-client"

const configuration: Configuration = {
  token: "your-checkeeper-token",
  secret: "your-checkeeper-secret",
  testMode: true, // Sends all requests as "test" requests
}

const client = new CheckeeperClient(configuration)

// Create a PDF of a check, but do not mail it
await client.createCheckPDF({
  /* See CreateCheckOptions */
})

// Mail a check (does not return a PDF -- use getCheckImage() to retrieve an image)
await client.mailCheck({
  /* See MailCheckOptions */
})

// See CheckeeperClient docs for available API calls.

Base64 utilities

When specifying fields that require base64 binary data, such as logo, signerImage, and attachment, use binaryDataToBase64 to convert a Buffer or ReadableStream to base64.

const logo = Buffer.from(/*...*/)
const signerImage = fs.createReadStream("signature.png")
const attachment = fs.createReadStream("attachment.pdf")

client.createCheckPDF({
  logo: binaryDataToBase64(logo),
  attach: binaryDataToBase64(attachment),
  signerImage: binaryDataToBase64(signerImage),
  // ...
})

When receiving a base64-encoded image in a Checkeeper response, use base64ToBuffer or base64ToStream to convert the image to a Buffer or ReadableStream.

const resp = await client.createCheckPDF({
  /* ... */
})

if (resp.success) {
  fs.writeFileSync("check.pdf", base64ToBuffer(resp.pdf))
  // Or
  const fileStream = fs.createWriteStream("check-image.jpg")
  base64ToStream(resp.pdf).pipe(fileStream)
}

Checkeeper Signature

The Checkeeper signature generator can be used independently, in place of the checkeeper-signature package.

import { getCheckeeperRequestSignature } from "checkeeper-client"

const signature = getCheckeeperRequestSignature(
  {
    /* Checkeeper request parameters */
  },
  "your-checkeeper-secret"
)