> For the complete documentation index, see [llms.txt](https://docs.freighter.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.freighter.app/extension-freighter-api/extension.md).

# Overview

Integrate Freighter into your web application using `@stellar/freighter-api`. This library lets you send and receive data from a user's Freighter extension.

`@stellar/freighter-api` adheres to the [SEP-43](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0043.md) standard for wallet interfaces on Stellar, and also offers additional methods beyond the spec such as `getNetworkDetails`, `addToken`, and `WatchWalletChanges`.

## Error Type

All methods return an optional `error` field of type `FreighterApiError`:

```typescript
interface FreighterApiError {
  code: number;
  message: string;
  ext?: string[];
}
```

## API Reference

| Category                                                         | Description                                         |
| ---------------------------------------------------------------- | --------------------------------------------------- |
| [Connecting](/extension-freighter-api/connecting.md)             | Detect Freighter, check permissions, request access |
| [Reading Data](/extension-freighter-api/reading-data.md)         | Get the user's address and network configuration    |
| [Signing](/extension-freighter-api/signing.md)                   | Sign transactions, auth entries, and messages       |
| [Token Management](/extension-freighter-api/token-management.md) | Add contract tokens to the user's wallet            |
| [Watching Changes](/extension-freighter-api/watching-changes.md) | Monitor wallet state changes in real time           |


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