The Base44 SDK provides a JavaScript interface for building apps on the Base44 platform.

You can use it in two ways:

• Inside Base44 apps: When Base44 generates your app, the SDK is already set up and ready to use.
• External apps: Use the SDK to build your own frontend or backend that uses Base44 as a backend service.

Inside Base44 apps: The SDK is already available. No installation needed.

External apps: Install the SDK via npm:

npm install @base44/sdk

The SDK provides access to Base44's functionality through the following modules:

• agents: Interact with AI agents and manage conversations.
• analytics: Track custom events in your app.
• app-logs: Access and query app logs.
• auth: Manage user authentication, registration, and session handling.
• connectors: Manage OAuth connections and access tokens for third-party services.
• entities: Work with your app's data entities using CRUD operations.
• functions: Execute backend functions.
• integrations: Access pre-built and third-party integrations.

How you get started depends on whether you're working inside a Base44-generated app or building your own.

In Base44-generated apps, the client is pre-configured. Just import and use it:

import { base44 } from "@/api/base44Client";

// Create a new task
const newTask = await base44.entities.Task.create({
  title: "Complete project documentation",
  status: "pending",
  dueDate: "2024-12-31",
});

// Update the task
await base44.entities.Task.update(newTask.id, {
  status: "in-progress",
});

// List all tasks
const tasks = await base44.entities.Task.list();

When using Base44 as a backend for your own app, install the SDK and create the client yourself:

import { createClient } from "@base44/sdk";

// Create a client for your Base44 app
const base44 = createClient({
  appId: "your-app-id", // Find this in the Base44 editor URL
});

// Read public data
const products = await base44.entities.Products.list();

// Authenticate a user (token is automatically set)
await base44.auth.loginViaEmailPassword("user@example.com", "password");

// Access user's data
const userOrders = await base44.entities.Orders.list();

By default, the client operates with user-level permissions, limiting access to what the current user can see and do. The service role provides elevated permissions for backend operations and is only available in Base44-hosted backend functions. External backends can't use service role permissions.

import { createClientFromRequest } from "npm:@base44/sdk";

Deno.serve(async (req) => {
  const base44 = createClientFromRequest(req);

  // Access all data with admin-level permissions
  const allOrders = await base44.asServiceRole.entities.Orders.list();

  return Response.json({ orders: allOrders });
});

The best way to get started with the JavaScript SDK is to have Base44 build an app for you. Once you have an app, you can explore the generated code and experiment with the SDK to see how it works in practice. You can also ask Base44 to demonstrate specific features of the SDK.

For a deeper understanding, check out these guides:

1. Base44 client - Work with the client in frontend, backend, and external app contexts.
2. Work with data - Create, read, update, and delete data.
3. Common SDK patterns - Authentication, integrations, functions, and error handling.

For the complete documentation and API reference, visit the Base44 Developer Docs.

Build the SDK from source:

npm install
npm run build

Run the test suite:

# Run all tests
npm test

# Run unit tests only
npm run test:unit

# Run with coverage
npm run test:coverage

For E2E tests, create a tests/.env file with:

BASE44_APP_ID=your_app_id
BASE44_AUTH_TOKEN=your_auth_token

Generate API documentation locally:

# Process and preview locally
npm run create-docs
cd docs
mintlify dev