> For the complete documentation index, see [llms.txt](https://docs.dckapintegrator.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dckapintegrator.com/tutorials/workflow-builder-tutorial/2.-hello-workflow/2.8-lets-write-code.md).
# 2.8 👨💻 Let's Write Code
Sometimes the built-in tools may not be enough to handle your specific data transformation needs. That is where Code Runner comes in — it allows you to write your own custom Python code inside the workflow, making use of previous step results and returning transformed data.
⚠️ **Warning: Always try to use the available built-in tools as much as possible before reaching for Code Runner. Using Code Runner unnecessarily may affect workflow performance.**
{% stepper %}
{% step %}
### Initialize Variable
Create a new batch workflow. Initialize a variable called orders as JSON with the following value:
```
[
{"order_id": 1, "amount": 500},
{"order_id": 2, "amount": 1200},
{"order_id": 3, "amount": 300},
{"order_id": 4, "amount": 850}
]
```
{% endstep %}
{% step %}
### Add Code Runner
Add a Code Runner tool. In the Inputs section, use the initialized variable:
| Name | Value |
| ------ | ---------------------- |
| orders | `{{variables.orders}}` |
In the coding section, write the following Python code to sort the orders by amount:
```
sorted_orders = sorted(inputs["orders"], key=lambda x: x["amount"])
response = sorted_orders
```
Give title and enable Show Output in Console Log
{% endstep %}
{% step %}
### Save and Sync
Enable Console Logs for the workflow, save the workflow and click Sync Now. Check the logs.
**Expected Output:**
```
[
{"order_id": 3, "amount": 300},
{"order_id": 1, "amount": 500},
{"order_id": 4, "amount": 850},
{"order_id": 2, "amount": 1200}
]
```
#### 🎉 You have successfully written custom Python code inside your workflow to sort data!
📌 **Things to Keep in Mind:**
**Allowed Packages:** `json, datetime, math, re, time, uuid, base64, hashlib`
**Allowed Built-in Methods:** `abs, all, any, bool, dict, enumerate, filter, float, format, int, isinstance, len, list, map, max, min, range, round, set, sorted, sum, str, tuple, type, zip and all exception classes`
⚠️ **Note:** Any packages or built-in functions outside the above list cannot be used or imported. **The maximum execution time is 30 seconds.**
\
{% endstep %}
{% endstepper %}
---
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