# copyStorage

Description: copyStorage cheatcode documentation

Note: This document was authored using MDX

  Source: https://github.com/NomicFoundation/hardhat-website/tree/main/src/content/docs/docs/reference/cheatcodes/Utilities/copy-storage.mdx

{/* This document contains content copied/adapted from the Foundry Book (MIT licensed). See LICENSE in the parent directory. */}

### Signature

```solidity
function copyStorage(address from, address to) external;
```

### Description

Utility cheatcode to copy storage of `from` contract to another `to` contract.
Cheatcode is not allowed if the target address has arbitrary storage set.

### Examples

Given a contract

```solidity
contract Counter {
  uint256 public count;

  function setCount(uint256 x) public {
    count = x;
  }
}
```

using `copyStorage` cheatcode copies the storage set on an instance to another address:

```solidity
function testCopyStorage() public {
  Counter original = new Counter();
  original.setCount(1000);
  Counter copy = new Counter();
  copy.setCount(1);
  // Check initial count on copy.
  assertEq(copy.count(), 1);

  vm.copyStorage(address(original), address(copy));
  // Value is copied from first contract to copy.
  assertEq(copy.count(), 1000);
}
```