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

# eth\_getBlockByHash - zkSync

Example code for the eth\_getBlockByHash JSON-RPC method. Сomplete guide on how to use eth\_getBlockByHash JSON-RPC in GetBlock.io Web3 documentation.

Returns information about an L2 block by its hash. Same response schema as `eth_getBlockByNumber` including the zkSync-specific `l1BatchNumber` field.

## Parameters

| Parameter        | Type    | Required | Description                                                          |
| ---------------- | ------- | -------- | -------------------------------------------------------------------- |
| blockHash        | string  | Yes      | 32-byte hash of the block                                            |
| fullTransactions | boolean | Yes      | If `true`, returns full transaction objects; if `false`, only hashes |

## Request Example

{% tabs %}
{% tab title="cURL" %}

```bash
curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
        "0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b",
        false
    ],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (Axios)" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
        "0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b",
        false
    ],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));
```

{% endtab %}

{% tab title="Python (Requests)" %}

```python
import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
        "0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b",
        false
    ],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)
```

{% endtab %}

{% tab title="Rust (Reqwest)" %}

```rust
use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "eth_getBlockByHash",
        "params": [
                "0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b",
                false
        ],
        "id": "getblock.io"
});

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}
```

{% endtab %}
{% endtabs %}

## Response Example

{% code overflow="wrap" %}

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "number": "0x2249b7",
        "hash": "0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b",
        "parentHash": "0x3a2e9d4b1c5f8a7e6d4b2c1f9a3e5d8b7c2f4a1d6e9b3c5f8a2d4e7b1c9f3a6e",
        "timestamp": "0x67891f24",
        "gasUsed": "0x2faf080",
        "transactions": [
            "0x22de7debaa98758afdaee89f447ff43bab5da3de6acca7528b281cc2f1be2ee9"
        ],
        "l1BatchNumber": "0x72582"
    }
}
```

{% endcode %}

## Response Parameters

| Field                | Type           | Description                                                                  |
| -------------------- | -------------- | ---------------------------------------------------------------------------- |
| result               | object \| null | Block object (same schema as `eth_getBlockByNumber`), or `null` if not found |
| result.number        | string         | L2 block number (hex)                                                        |
| result.hash          | string         | L2 block hash                                                                |
| result.l1BatchNumber | string         | L1 batch number containing this L2 block                                     |

## Use Cases

* Resolving a block from a known hash (e.g. from a receipt)
* Indexers that walk by hash rather than height
* Cross-referencing zkSync L2 blocks with their L1 batches

## Error Handling

| Status Code | Error Message     | Cause                                       |
| ----------- | ----------------- | ------------------------------------------- |
| 403         | Forbidden         | Missing or invalid `<ACCESS-TOKEN>`         |
| -32602      | Invalid params    | Request parameters are missing or malformed |
| 429         | Too Many Requests | Rate limit exceeded for your plan           |

## SDK Integration

{% tabs %}
{% tab title="zksync-ethers (JavaScript)" %}
{% code overflow="wrap" %}

```javascript
import { Provider } from 'zksync-ethers';

const provider = new Provider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

// zksync-ethers exposes both standard Ethereum methods and zks_* methods
// through typed accessors. For raw access:
const result = await provider.send('eth_getBlockByHash', ["0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b", false]);
console.log(result);
```

{% endcode %}
{% endtab %}

{% tab title="zksync2-python (Python)" %}
{% code overflow="wrap" %}

```python
from zksync2.module.module_builder import ZkSyncBuilder

zk_web3 = ZkSyncBuilder.build('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/')

# zksync2-python exposes the JSON-RPC layer directly.
result = zk_web3.zksync._zks_endpoints if 'eth_getBlockByHash'.startswith('zks_') else None
# Or call any method generically:
result = zk_web3.provider.make_request('eth_getBlockByHash', ["0x4f3a1d6e8c2b9a7e5d3f1c8a4b6e9d2f5a8c3e7b1d4f9a6c2e5b8d3f7a1c4e9b", false])
print(result)
```

{% endcode %}
{% endtab %}
{% endtabs %}