---
title: Dump the current input JSON
slug: pc4g2155
canonical_url: https://docs.coveo.com/en/pc4g2155/
collection: index-content
source_format: adoc
---
# Dump the current input JSON
The purpose of this example is to show how to write the current input JSON of a pre-push extension script to a file to help you develop and debug your scripts.

The script creates an `Extensions` folder under the [`COVEO_LOGS_ROOT`](https://docs.coveo.com/en/3269#coveo-pre-push-extension-environment-variables) folder (if it doesn't already exist) and a subfolder named after the [source ID](https://docs.coveo.com/en/3390#copy-a-source-name-or-id).
It writes the JSON input item (the `body` argument) to a .log file in that folder.

> **Important**
>
> Apply this extension only to a [duplicate of a production source](https://docs.coveo.com/en/3390#duplicate-a-source) with a name that clearly indicates it's for testing.
> In this test source, crawl only a [small content subset](https://docs.coveo.com/en/2992/) for faster debugging iterations and to limit log file size.

After applying this extension to your test source and running a source rebuild, open the .log file to review the JSON for each crawled item.

```python
# Import required Python libraries. Note: Add non-Python standard libraries to the requirements.txt file.
import sys
import os
import json
import logging
from logging.handlers import TimedRotatingFileHandler

# Initialize a logger.
log_folder = os.path.join(os.getenv('COVEO_LOGS_ROOT'), 'Extensions', os.getenv('SOURCE_ID','unknown'))
os.makedirs(log_folder, exist_ok=True)
fname = f"{os.getenv('OPERATION_TYPE','unknown')}_{os.getenv('OPERATION_ID','unknown')}.log"
fpath = os.path.join(log_folder, fname)
handler = TimedRotatingFileHandler(fpath, when='midnight')
handler.suffix = "%Y-%m-%d"
formatter = logging.Formatter(
    fmt='%(asctime)s.%(msecs)03d %(levelname)s %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S'
)
handler.setFormatter(formatter)
logging.basicConfig(level=logging.INFO, handlers=[handler])

# -----------------------------------------------------------------
# Extension entry point. The do_extension function must be defined.
# -----------------------------------------------------------------
def do_extension(body):
    # Log basic item info
    logging.info('The extension will be executed on the item: %s',
                 body.get('documentId', '<missing>'))

    # Pretty-print the input JSON as a multi-line string
    json_text = json.dumps(body, indent=2, ensure_ascii=False)

    # Log the entire JSON as a single log entry with embedded newlines
    logging.info("Input JSON:\n%s", json_text)

    return body
```