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## `dumpState`

### Signature

```solidity
function dumpState(string calldata pathToStateJson) external;
```

### Description

Writes the current EVM state to a JSON file in the genesis `alloc` format: a map from account address to its balance, nonce, code, and storage.

Internal bookkeeping accounts are excluded from the dump, such as the cheatcode address, the console address, the default test caller and sender, and empty accounts.

The resulting file can be loaded back with [`loadAllocs`](/reference/cheatcodes/load-allocs), used with `anvil --init`, or embedded in a genesis file. This is useful for capturing an expensive setup once and restoring it cheaply, or for exporting test state to a local node.

### Parameters

| Parameter         | Type     | Description                              |
|-------------------|----------|------------------------------------------|
| `pathToStateJson` | `string` | The file path the state JSON is written to |

### Examples

```solidity [test/DumpState.t.sol]
function testDumpState() public {
    vm.deal(address(0xBEEF), 10 ether);

    Counter counter = new Counter();
    counter.setNumber(42);

    vm.dumpState("./dump.json");
}
```

The dump contains entries of the form:

```json [dump.json]
{
  "0x2e234dae75c793f67a35089c9d99245e1c58470b": {
    "nonce": "0x1",
    "balance": "0x0",
    "code": "0x6080604052...",
    "storage": {
      "0x0000000000000000000000000000000000000000000000000000000000000000": "0x000000000000000000000000000000000000000000000000000000000000002a"
    }
  }
}
```

### Related Cheatcodes

* [`loadAllocs`](/reference/cheatcodes/load-allocs) - Load a genesis alloc JSON into the EVM state
* [`snapshotState`](/reference/cheatcodes/state-snapshots) - Snapshot and restore state in memory