# JavaScript

The JavaScript SDK is the REST client package for `antd`.

## Install

```bash
npm install antd
```

## Connect to the daemon

```javascript
import { RestClient, createClient } from "antd";

// Default REST client
const client = createClient();

// Explicit constructor
const directClient = new RestClient({ baseUrl: "http://localhost:8082" });

// Custom URL or timeout
const remoteClient = createClient({ baseUrl: "http://custom-host:9090", timeout: 60000 });

// Auto-discover from daemon.port
const { client: discoveredClient, url } = RestClient.autoDiscover();
console.log(url);
```

## Store and retrieve data

For upload examples in this section, start `antd` in a write-enabled mode first. On the default network, that means wallet plus EVM payment configuration. On a local devnet, `ant dev start` provisions that for you.

```javascript
import { createClient } from "antd";

async function main() {
  const client = createClient();
  const status = await client.health();
  if (!status.ok) throw new Error("Daemon is not healthy");

  const result = await client.dataPutPublic(Buffer.from("Hello from JavaScript!"));
  console.log(result.address);

  const data = await client.dataGetPublic(result.address);
  console.log(data.toString());
}

main().catch((error) => {
  console.error(error);
  process.exit(1);
});
```

## Type mappings

| Autonomi type          | JavaScript type                                                                                                                                                                                                     |
| ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `HealthStatus`         | object with `ok`, `network`, `version`, `evmNetwork`, `uptimeSeconds`, `buildCommit`, `paymentTokenAddress`, and `paymentVaultAddress`                                                                              |
| `PutResult`            | `{ cost: string, address: string }`                                                                                                                                                                                 |
| `FileUploadResult`     | `{ address: string, storageCostAtto: string, gasCostWei: string, chunksStored: number, paymentModeUsed: string }`                                                                                                   |
| `WalletAddress`        | `{ address: string }`                                                                                                                                                                                               |
| `WalletBalance`        | `{ balance: string, gasBalance: string }`                                                                                                                                                                           |
| `PaymentInfo`          | `{ quoteHash: string, rewardsAddress: string, amount: string }`                                                                                                                                                     |
| `CandidateNodeEntry`   | `{ rewardsAddress: string, amount: string }`                                                                                                                                                                        |
| `PoolCommitmentEntry`  | `{ poolHash: string, candidates: CandidateNodeEntry[] }`                                                                                                                                                            |
| `PrepareUploadResult`  | object with `uploadId`, `paymentType`, `payments`, `totalAmount`, `paymentVaultAddress`, `paymentTokenAddress`, `rpcUrl`, plus optional `depth`, `poolCommitments`, and `merklePaymentTimestamp` for Merkle uploads |
| `FinalizeUploadResult` | `{ address: string, chunksStored: number, dataMap: string, dataMapAddress: string }`                                                                                                                                |
| `PrepareChunkResult`   | `{ address: string, alreadyStored: boolean, uploadId: string, paymentType: string, payments: PaymentInfo[], totalAmount: string, paymentVaultAddress: string, paymentTokenAddress: string, rpcUrl: string }`        |
| `UploadCostEstimate`   | `{ cost: string, fileSize: number, chunkCount: number, estimatedGasCostWei: string, paymentMode: string }`                                                                                                          |
| Raw data               | `Buffer`                                                                                                                                                                                                            |

## Error handling

```javascript
import { NotFoundError, PaymentError, createClient } from "antd";

async function main() {
  const client = createClient();

  try {
    await client.dataGetPublic("nonexistent_address");
  } catch (error) {
    if (error instanceof NotFoundError) {
      console.log("Data not found");
    } else if (error instanceof PaymentError) {
      console.log("Insufficient funds");
    } else {
      throw error;
    }
  }
}

main().catch((error) => {
  console.error(error);
  process.exit(1);
});
```

## Full API reference

For all available daemon endpoints, see the [REST API](/developers/sdk/install/reference/rest-api.md).


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