# envBytes32

Description: envBytes32 cheatcode documentation

Note: This document was authored using MDX

  Source: https://github.com/NomicFoundation/hardhat-website/tree/main/src/content/docs/docs/reference/cheatcodes/External/env-bytes32.mdx

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

### Signature

```solidity
function envBytes32(string calldata key) external returns (bytes32 value);
```

```solidity
function envBytes32(
  string calldata key,
  string calldata delimiter
) external returns (bytes32[] memory values);
```

### Description

Read an environment variable as `bytes32` or `bytes32[]`.

### Tips

- For arrays, you can specify the delimiter used to separate the values with the `delimiter` parameter.

### Examples

#### Single Value

With environment variable `BYTES32_VALUE=0x00`,

```solidity
string memory key = "BYTES32_VALUE";
bytes32 expected = bytes32(0x0000000000000000000000000000000000000000000000000000000000000000);
bytes32 output = vm.envBytes32(key);
assert(output == expected);
```

#### Array

With environment variable `BYTES32_VALUES=0x7109709ECfa91a80626fF3989D68f67F5b1DD12D,0x00`,

```solidity
string memory key = "BYTES32_VALUES";
string memory delimiter = ",";
bytes32[2] memory expected = [
    bytes32(0x7109709ECfa91a80626fF3989D68f67F5b1DD12D000000000000000000000000),
    bytes32(0x0000000000000000000000000000000000000000000000000000000000000000)
];
bytes32[] memory output = vm.envBytes32(key, delimiter);
assert(keccak256(abi.encodePacked((output))) == keccak256(abi.encodePacked((expected))));
```