Nango is an open-source platform designed to help engineering teams rapidly build and maintain product integrations with third-party APIs. It solves the complex, repetitive challenges of OAuth2/OAuth1 authentication, credential storage, token refresh, API proxying, data syncing, and webhook handling—common pain points when connecting SaaS products or AI agents to external services. Rather than forcing teams to build custom integration infrastructure from scratch, Nango provides a modular, secure, and observable foundation that can be embedded directly into your application. It’s ideal for SaaS companies, AI product teams, and developers who need to connect their software to tools like Salesforce, Slack, Google Workspace, Stripe, or custom APIs without reinventing the wheel for each integration.
What You Get
- API Auth with Embedded UI - Nango provides pre-built, white-label OAuth2/OAuth1 authentication flows that can be embedded directly into your application’s UI with customizable forms and guidance for users, eliminating the need to implement complex authorization logic manually.
- Secure Credential Management - Automatically stores, retrieves, and refreshes access tokens and refresh tokens for 600+ APIs with encrypted storage, reducing security risks from hardcoded credentials or manual token handling.
- Request Proxying - Forwards API requests from your application to third-party services while injecting the correct credentials, headers, and parameters—no need to manage API keys per connection in your codebase.
- Data Syncing - Continuously pulls data from connected APIs into your database using configurable sync scripts (e.g., sync contacts from Salesforce or calendar events from Google Calendar), with built-in deduplication and error handling.
- Actions - Encapsulate common integration use cases (e.g., ‘send invoice to QuickBooks’) into reusable, parameterized actions that can be triggered via API or webhook.
- Webhooks with Universal Interface - Receives and normalizes webhooks from any API (e.g., Stripe, GitHub) into a consistent JSON format, allowing your app to react uniformly regardless of the source.
- AI Tool Calling & MCP Server - Exposes your integrations as standardized tools for LLMs (like OpenAI or Anthropic) via the Model Context Protocol, enabling AI agents to interact with external APIs without manual API calls.
- Credential Monitoring & Webhook Alerts - Detects when tokens expire or become invalid and triggers webhooks to notify your system, enabling proactive re-authentication or user alerts.
- Observability & Logging - Provides detailed logs for every API call, sync run, and action execution with timestamps, response codes, and error traces—critical for debugging integrations in production.
- Management Dashboard & APIs - Offers a web UI and REST APIs to view connected accounts, monitor sync status, revoke access, and manage integration configurations without touching code.
Common Use Cases
- Building a multi-tenant SaaS dashboard with financial data - A fintech startup uses Nango to connect users’ QuickBooks, Xero, and Stripe accounts to display unified financial reports without writing custom OAuth flows for each provider.
- Creating an AI-powered CRM assistant - A startup embeds Nango’s AI tool calling to let their LLM agent fetch customer data from HubSpot, create tickets in Zendesk, and schedule meetings via Calendly—all through natural language prompts.
- Problem: Building 10+ API integrations took 6 months → Solution with Nango - A team spent months implementing OAuth2 for each API. With Nango, they added 8 new integrations in under two weeks by configuring syncs and actions via the dashboard.
- DevOps teams managing microservice integrations - Engineers use Nango’s proxy and credential management to securely route requests from internal services to external APIs like AWS, GitHub, or Slack without exposing secrets in code or env vars.
Under The Hood
Nango is a comprehensive integration platform designed to simplify the process of connecting with third-party APIs and managing data synchronization across services. It adopts a modular monolithic architecture that promotes reusability, scalability, and clear separation of concerns across its diverse packages.
Architecture
Nango follows a well-structured layered design with distinct workspaces for billing, usage tracking, CLI tools, and UI components.
- The system is organized into multiple workspaces, each encapsulating a functional domain to support modularity and maintainability.
- Core architectural patterns such as strategy and factory are applied to enable flexible integration handling and extensibility.
- Component communication is facilitated through well-defined interfaces and shared types, ensuring seamless interaction between frontend and backend modules.
Tech Stack
Built primarily with TypeScript, Nango leverages modern JavaScript frameworks and tools to support scalable development.
- The platform uses TypeScript for type safety, Node.js with Express for backend services, and React for frontend components.
- Key dependencies include Nango’s own ecosystem packages, Knex for database operations, Zod for validation, and Axios for HTTP communication.
- Development workflows are supported by Vite, Docker, and NPM workspaces for efficient monorepo management.
Code Quality
Code quality in Nango reflects a mature approach to testing and error handling, with consistent style and structure.
- Comprehensive test coverage is evident across modules, ensuring reliability and maintainability through unit and integration tests.
- Error handling is implemented using try/catch blocks and custom error types, enhancing system robustness.
- The codebase maintains a high level of consistency in naming and structure, although some legacy patterns indicate minor technical debt.
What Makes It Unique
Nango distinguishes itself through its unified approach to API integration, combining flexibility with built-in observability and billing.
- It abstracts the complexity of third-party API connections, offering a developer-first solution for managing integrations at scale.
- Built-in usage tracking and billing capabilities provide unique value in enterprise-grade integration platforms.
- The extensible framework allows developers to customize and extend integrations without sacrificing system stability.