# eth\_getStorageAt

**Parameters:**

1. `DATA`, 20 Bytes - address of the storage.
2. `QUANTITY` - integer of the position in the storage.
3. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://ethereum.org/en/developers/docs/apis/json-rpc/#default-block)

**Returns:**

`DATA` - the value at this storage position.

**Code Examples:**

Calculating the correct position depends on the storage to retrieve. 

Consider the following contract deployed at 

`0x295a70b2de5e3953354a6a8344e616ed314d7251` by address 

`0x391694e7e0b0cce554cb130d723a9d27458f9298`.

```
contract Storage {
    uint pos0;
    mapping(address => uint) pos1;
    function Storage() {
        pos0 = 1234;
        pos1[msg.sender] = 5678;
    }
}
```

Retrieving the value of pos0 is straight forward:

```
var myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({
  "method": "eth_getStorageAt",
  "params": [
    "0x295a70b2de5e3953354a6a8344e616ed314d7251",
    "0x0",
    "latest"
  ],
  "id": 1,
  "jsonrpc": "2.0"
});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("https://api.ebs.ezat.io/core/api/v1.0/rpc/aurora/mainnet?x-api-key-id=API-KEY-ID&x-api-key=API-KEY", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x00000000000000000000000000000000000000000000000000000000000004d2"
}
```

Retrieving an element of the map is harder. The position of an element in the map is calculated with:

```
keccack(LeftPad32(key, 0), LeftPad32(map position, 0))
```

This means to retrieve the storage on pos1\["0x391694e7e0b0cce554cb130d723a9d27458f9298"] we need to calculate the position with:

```
keccak(
  decodeHex(
    "000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" +
      "0000000000000000000000000000000000000000000000000000000000000001"
  )
)
```

The geth console which comes with the web3 library can be used to make the calculation:

```
> var key = "000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" + "0000000000000000000000000000000000000000000000000000000000000001"
undefined
> web3.sha3(key, {"encoding": "hex"})
"0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9"
```

Now to fetch the storage:

```
var myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({
  "method": "eth_getStorageAt",
  "params": [
    "0x295a70b2de5e3953354a6a8344e616ed314d7251",
    "0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9",
    "latest"
  ],
  "id": 1,
  "jsonrpc": "2.0"
});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("https://api.ebs.ezat.io/core/api/v1.0/rpc/aurora/mainnet?x-api-key-id=API-KEY-ID&x-api-key=API-KEY", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x000000000000000000000000000000000000000000000000000000000000162e"
}
```


---

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