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Beyond data management, the Base44 SDK provides modules for authentication, integrations, custom backend functions, and more. This guide covers common patterns for working with these features.

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Authentication

The auth module provides methods for working with user authentication. The most common use case is getting information about the currently authenticated user. 
const user = await base44.auth.me();
console.log(user.email, user.name, user.role);

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Core integrations

Base44 provides built-in integrations for common tasks like working with AI, sending emails, and handling files. Access these through the integrations.Core module. 
const response = await base44.integrations.Core.InvokeLLM({
  prompt: "Write a welcome email for a new user",
  responseFormat: "text",
});

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Backend functions

The functions module lets you invoke custom backend functions defined in your app. Pass any data your function needs as parameters. 
const result = await base44.functions.invoke("processOrder", {
  orderId: "123",
  action: "fulfill",
});

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Error handling

All SDK errors are instances of Base44Error, which includes the HTTP status code and error details. Use this to handle different error scenarios gracefully. 
import { Base44Error } from "@base44/sdk";

try {
  const result = await base44.entities.Task.list();
} catch (error) {
  if (error instanceof Base44Error) {
    console.error(`Status: ${error.status}`);
    console.error(`Message: ${error.message}`);
    console.error(`Code: ${error.code}`);
  } else {
    console.error("Unexpected error:", error);
  }
}

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See more

Base44 client

Work with the client in different contexts

auth module

Complete authentication API reference

integrations module

Complete integrations API reference

functions module

Complete functions API reference