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

<AgentInstructions>

## Submitting Feedback

If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback:

POST https://docs.chainstack.com/feedback

```json
{
  "path": "/reference/arbitrum-debug-printblock",
  "feedback": "Description of the issue"
}
```

Only submit feedback when you have something specific and actionable to report.

</AgentInstructions>

# debug_printBlock | Arbitrum

Arbitrum API method that returns a human-readable representation of a block. Unlike `eth_getBlockByNumber` which returns structured JSON, this method returns a verbose text dump of the entire block structure including all header fields, transactions, and uncles. The output format uses Go's `spew.Sdump` formatting.

<Note>
  Learn how to [deploy a node](/docs/debug-and-trace-apis#arbitrum) with the debug and trace API methods enabled.
</Note>

<Warning>
  This method is available for post-Nitro blocks only (block 22,207,815 and later). For pre-Nitro blocks, use the `arbtrace_*` methods instead.
</Warning>

<Check>
  **Get your own node endpoint today**

  [Start for free](https://console.chainstack.com/) and get your app to production levels immediately. No credit card required.

  You can sign up with your GitHub, X, Google, or Microsoft account.
</Check>

## Parameters

* `number` — the block number as a decimal integer.

## Response

* `result` — a human-readable string representation of the block, including all internal fields and nested structures.

## `debug_printBlock` code examples

<CodeGroup>
  ```javascript ethers.js theme={"system"}
  const ethers = require('ethers');
  const NODE_URL = "YOUR_CHAINSTACK_ENDPOINT";
  const provider = new ethers.JsonRpcProvider(NODE_URL);

  const debugPrintBlock = async (blockNumber) => {
    const result = await provider.send("debug_printBlock", [blockNumber]);
    console.log(result);
  };

  debugPrintBlock(30000000);
  ```

  ```python web3.py theme={"system"}
  from web3 import Web3
  node_url = "YOUR_CHAINSTACK_ENDPOINT"
  web3 = Web3(Web3.HTTPProvider(node_url))

  result = web3.provider.make_request('debug_printBlock', [30000000])
  print(result)
  ```
</CodeGroup>

## Use case

The `debug_printBlock` method is useful for quick debugging when you need a comprehensive view of a block's internal structure. The human-readable output format reveals all fields including those not typically exposed by standard RPC methods, making it valuable for diagnosing block-level issues and understanding the complete block composition.


## OpenAPI

````yaml /openapi/arbitrum_node_api/debug_and_trace/debug_printBlock.json POST /66f812de2a6724a75a51f60dd6f2a154
openapi: 3.0.0
info:
  title: Chainstack Node API
  version: 1.0.6
  description: >-
    This is an API for interacting with a Chainstack node using the
    debug_printBlock method.
servers:
  - url: https://nd-954-882-037.p2pify.com
security: []
paths:
  /66f812de2a6724a75a51f60dd6f2a154:
    post:
      tags:
        - upload
      summary: debug_printBlock
      operationId: debugPrintBlock
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                id:
                  type: integer
                  default: 1
                jsonrpc:
                  type: string
                  default: '2.0'
                method:
                  type: string
                  default: debug_printBlock
                params:
                  type: array
                  items:
                    type: integer
                    title: Block Number
                    description: The block number as a decimal integer.
                  default:
                    - 30000000
      responses:
        '200':
          description: Returns a human-readable representation of the block.
          content:
            application/json:
              schema:
                type: object
                properties:
                  jsonrpc:
                    type: string
                  id:
                    type: integer
                  result:
                    type: string

````