One of the most complicated aspects of QuickBooks Desktop is its error handling. QuickBooks errors are often cryptic and unhelpful, and they can arise from several sources (e.g., Web Connector, QB request processor, QuickBooks Desktop itself), each using a different format and mechanism. Sometimes, their errors do not even describe what went wrong when they could! Conductor unifies and simplifies these errors into a single, consistent error format and augments each with our own user-friendly language that describes how to resolve the issue. With Conductor, every error includes plenty of useful information.

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Error types

Any error object you receive will be an instance of one of the following error types:
Error TypeDescription
INTEGRATION_ERRORRaised when the third-party integration encounters an error while processing the end-user’s request. This often results from an issue with the request or data handling that requires your attention to resolve.

E.g., a ListID you provided was not found in QuickBooks Desktop, or an accounting value you supplied did not adhere to the integration’s accounting rules.

Refer to error.integrationCode for the error code returned by the integration, if available.
INTEGRATION_CONNECTION_ERRORRaised when a connection error occurs with the third-party integration on the end-user’s side. This typically indicates an issue with the end-user’s connection or configuration, which they must resolve. In other words, you cannot take action to fix these errors.

E.g., the Web Connector failed to connect to QuickBooks Desktop on the end-user’s computer.

Refer to error.integrationCode for the error code returned by the integration connector, if available.

❗ We recommend not triggering alerts for these errors because only the end-user can fix them. See Global error handling for an example of this.
INVALID_REQUEST_ERRORRaised when you make an API call with the wrong parameters, in the wrong state, or in an invalid way.
AUTHENTICATION_ERRORRaised when Conductor cannot authenticate you with the credentials you provided. E.g., an incorrect API key.
ConductorPermissionErrorRaised when you attempt to access a resource that is not allowed.
ConductorConnectionErrorRaised when there was a network problem between the client (on your server) and Conductor’s servers. E.g., a downed network or a bad TLS certificate.
ConductorInternalErrorRaised when something went wrong on Conductor’s end. (These are rare.)

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Common error codes

Error CodeDescription
INTEGRATION_CONNECTION_NOT_SET_UPOccurs when an API request is made for an end-user who has not completed the authentication flow. This typically happens when a user begins the QuickBooks Desktop setup process (creating an end-user) but doesn’t finish configuring their company file connection before your app attempts to make API calls.
INTEGRATION_CONNECTION_NOT_ACTIVEIndicates that the Web Connector connection is offline. This error occurs when Conductor hasn’t received a heartbeat from Web Connector in over two minutes, suggesting the connector isn’t running or is experiencing issues on the end-user’s machine.
QBD_CONNECTION_ERRORRaised when the Web Connector is online but cannot establish a connection with QuickBooks Desktop. Common causes include having the wrong company file open, QuickBooks Desktop not running, or insufficient permissions.
QBD_REQUEST_ERRORIndicates a QuickBooks Desktop business logic error. These errors occur when a request violates QuickBooks’ business rules - for example, attempting to create a bank account with a negative opening balance or using an invalid reference to another entity.
QBD_REQUEST_TIMEOUTOccurs when QuickBooks Desktop successfully connects but fails to respond within the expected timeframe. This can happen in scenarios where QuickBooks needs to be launched and load a large company file, or when processing requests involving substantial amounts of data.
These error codes are accessible via the error.code property of any Conductor error. For integration-specific errors, you can also reference error.integrationCode for the raw error code from QuickBooks Desktop.

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User-facing error messages

Every Conductor error includes two error messages, and you should use both:
  1. error.message: The technical error message that you should log for debugging.
  2. error.userFacingMessage: The descriptive user-friendly error message explicitly written for the end-user that often contains instructions helping the end-user resolve the issue.
Your app’s UI should display error.userFacingMessage to your end-users for every Conductor error while logging the full error object for your debugging purposes.
For example, see the message and userFacingMessage in the following QBD connection error:
Example Conductor error object
{
  "error": {
    // The developer-facing error message, which includes the QBD-provided
    // error code and the QBD-provided error message.
    "message": "QBD Connection Error (0x80040420): The QuickBooks user
      has denied access.",
    // The user-facing error message with instructions for the end-user to
    // resolve the issue.
    "userFacingMessage": "We could not connect to QuickBooks Desktop
      because we must re-authorize our connection. To fix this, open
      QuickBooks Desktop, log in as Admin, navigate to 'Edit >
      Preferences → Integrated Applications', click 'Company Preferences',
      select our app, click 'Properties...', ensure 'Allow this
      application to log in automatically' is checked, then click 'OK'.
      Then try again.",
    "type": "INTEGRATION_CONNECTION_ERROR",
    "code": "QBD_CONNECTION_ERROR",
    "httpStatusCode": 502,
    "integrationCode": "0x80040420",
    "requestId": "req_1234567890"
  }
}

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Error handling in our SDKs

Our errors in our SDKs are a bit janky at the moment. We’re working on it. For now, we recommend the approach shown below for typing and unwrapping Conductor errors from our SDK. The example below is for our Node.js SDK, but the approach would be similar for our Python SDK.
Check the connection status
import Conductor, { APIError as ConductorError } from "conductor-node";

// Yes, manually define this inline.
interface IConductorError {
  message: string;
  userFacingMessage: string;
  type: string;
  code: string;
  httpStatusCode: number;
  integrationCode?: string;
  requestId: string;
}

const conductor = new Conductor({ apiKey: "{{YOUR_SECRET_KEY}}" });

try {
  // Check the connection status
  await conductor.qbd.healthCheck({ conductorEndUserId: "{{END_USER_ID}}" });
  updateUI("QuickBooks Desktop is successfully connected!");
} catch (error) {
  if (error instanceof ConductorError) {
    // Unwrap Conductor error
    const conductorError = error?.error?.error as IConductorError;

    if (conductorError.code === "INTEGRATION_CONNECTION_NOT_SET_UP") {
      // This specific error code indicates the user needs to go through the auth
      // flow. Either they never started it, or didn't complete it.
      const authSession = await conductor.authSessions.create({
        publishableKey: "{{YOUR_PUBLISHABLE_KEY}}",
        endUserId: "{{END_USER_ID}}",
      });
      updateUI(
        "Set up your QuickBooks Desktop connection: " + authSession.authFlowUrl,
      );
    } else {
      // Display connection errors for your user to resolve.
      updateUI("An error occurred: " + conductorError.userFacingMessage);
    }
  } else {
    throw error;
  }
}

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Specific error handling

If you need special handling for specific errors, you can wrap individual API calls, as shown below. Using async/await: 
import Conductor, { APIError as ConductorError } from "conductor-node";

const conductor = new Conductor({ apiKey: "{{YOUR_SECRET_KEY}}" });

try {
  const newAccount = await conductor.qbd.accounts.create({
    conductorEndUserId: "end_usr_1234567abcdefg",
    accountType: "bank",
    name: "Accounts-Payable",
  });
} catch (error) {
  if (error instanceof ConductorError) {
    // Unwrap Conductor error
    const conductorError = error?.error?.error;
    // Check `conductorError.code`, `conductorError.integrationCode`, etc., for special handling.
  } else {
    // ...
  }
}
Or in the form of a rejected promise: 
import Conductor, { APIError as ConductorError } from "conductor-node";

const conductor = new Conductor({ apiKey: "{{YOUR_SECRET_KEY}}" });

conductor.qbd.accounts
  .create({
    conductorEndUserId: "end_usr_1234567abcdefg",
    accountType: "bank",
    name: "Accounts-Payable",
  })
  .then((newAccount) => {
    // ...
  })
  .catch((error) => {
    if (error instanceof ConductorError) {
      // Check `error.code`, `error.integrationCode`, etc., for special handling.
    } else {
      // ...
    }
  });

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Global error handling

It is unnecessary to wrap each API call individually, as demonstrated in the examples above. Instead, we suggest implementing a global error handler for your server, such as app.use((error, ...) => { ... }) in Express. Within this handler, perform the following actions:
  1. For any ConductorError instance, display the error.userFacingMessage property to the end-user in your app’s UI while logging the complete error object.
  2. For all ConductorError instances, transmit the full error object to your error-tracking service (e.g., Sentry):
    • Send a warning for instances of INTEGRATION_CONNECTION_ERROR, which are not actionable by you and can only be resolved by the end-user; for example, failure to connect to QuickBooks Desktop on the end-user’s computer.
    • Send an error for all other ConductorError instances, such as an invalid API key.
For example, using an Express error handler: 
import * as Sentry from "@sentry/node";
import Conductor, { APIError as ConductorError } from "conductor-node";

const conductor = new Conductor({ apiKey: "{{YOUR_SECRET_KEY}}" });

app.use((error, req, res, next) => {
  if (error instanceof ConductorError) {
    // Unwrap Conductor error
    const conductorError = error?.error?.error as IConductorError;

    Sentry.captureException(error, {
      level:
        conductorError.type === "INTEGRATION_CONNECTION_ERROR"
          ? "warning"
          : "error",
    });
    // Return a different error message for your end-user to see in your
    // app's UI.
    res
      .status(500)
      .send({ error: { message: conductorError.userFacingMessage } });
  } else {
    // ...
  }
});