> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uniblock.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# trace_replayTransaction

> Replays a transaction, returning the traces.

### Parameters

<ParamField query="chainId" type="string" default="1" required>
  Unique identifier for a blockchain network.
</ParamField>

<ParamField body="id" type="number" default={1} required>
  Request identifier used to match responses.
</ParamField>

<ParamField body="jsonrpc" type="string" default="2.0" required>
  JSON-RPC version.
</ParamField>

<ParamField body="method" type="string" default="trace_replayTransaction" required>
  JSON-RPC method name.
</ParamField>

<ParamField body="params" type="object" default={["0x02d4a872e096445e80d05276ee756cefef7f3b376bcec14246469c0cd97dad8f",["trace"]]} placeholder="[&#x22;0x02d4a872e096445e80d05276ee756cefef7f3b376bcec14246469c0cd97dad8f&#x22;,[&#x22;trace&#x22;]]" required>
  Parameters for method trace\_replayTransaction: \[hash, traceTypes].

  Positional parameters for <code>trace\_replayTransaction</code>:

  <ul>
    <li><code>params\[0]</code>: 32 Bytes - Hash of the transaction.</li>
    <li><code>params\[1]</code>: Types of traces to collect: "vmTrace", "trace", and/or "stateDiff".</li>
  </ul>
</ParamField>

### Returns

<ResponseField name="result" type="object">
  Object - Block traces.
</ResponseField>

<RequestExample>
  ```bash Curl theme={null}
  curl --request POST \
    --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=1 \
    --header 'content-type: application/json' \
    --data '{
      "id": 1,
      "jsonrpc": "2.0",
      "method": "trace_replayTransaction",
      "params": [
        "0x02d4a872e096445e80d05276ee756cefef7f3b376bcec14246469c0cd97dad8f",
        [
          "trace"
        ]
      ]
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json Success theme={null}
  {
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
      "output": "0x",
      "stateDiff": null,
      "trace": [
        {
          "action": {
            "__truncated": true
          },
          "result": {
            "__truncated": true
          },
          "subtraces": 0,
          "traceAddress": [
            "..."
          ],
          "type": "call"
        }
      ],
      "vmTrace": null
    }
  }
  ```
</ResponseExample>