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

# Using Code Blocks in Box Notes

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To enhance your collaboration during code development and review, Box's web app enables you to add code blocks to your Box Notes.

In Box Notes, a code block contains a scrollable text field, a language selection field, and a selection to remove the code block.

After adding a code block, you can either paste or type code into your code block's text field.

Code blocks in Box Notes support the following software languages:

* Bash shell
* C
* C++
* C#
* CSS
* Dart
* Go
* HTML
* JavaScript
* Perl
* PHP
* PowerShell
* Python Java
* R
* Ruby
* Rust
* Scala
* SQL
* Swift

<Warning>
  **IMPORTANT:**

  * After selecting a language for your code block, you cannot select a different language for that code block.
  * Box Notes does not support the use of code blocks on mobile devices.
</Warning>

As with all content in Box Notes, multiple people can simultaneously edit a code block's contents.\
When someone is working in your code block's contents, Box displays a collaboration icon in the code block's text field identifying the person's user name.\
Collaborators with Read-only permission can view but not edit a code block's contents.

<Note>
  **Note:**

  Box Notes does not support the insertion of other Box Note elements — for example, tables, images, call-out boxes, headings, or other code blocks — into code blocks.  To learn more about using other Box Notes elements, start [here](/en/box-notes/creating-and-editing-box-notes/introducing-box-notes).
</Note>

**To insert a code block in a Box Note:**

1. Click where you want to insert a code block.  Beside the cursor, Box displays **+**.
2. Click **+** then select **Code Block**.
3. Type or paste the code into your code block's text field.

**To select a software language for your code block:**

1. In the top-left corner of the code block, click the menu icon.  Box displays a drop-down menu.
2. In the drop-down menu, click the software language you want to use.  After selecting a language, you cannot select a different language for this code block.

**To search for and select a software language for your code block:**

1. In the top-left corner of the code block, click the menu icon.  Box displays a drop-down menu.
2. In the **Search Languages** field, type the name of the software language you want to use.  As you type, Box displays available languages.
3. Click the software language you want to use.  After selecting a language, you cannot select a different language for this code block.

**To remove a code block:**

1. In the top-right corner of the code block, click the ellipsis, "**...**".
2. Select **Remove**.

**To increase or reduce a code block's height:**

1. Hover your mouse in the code block, then right-click.
2. To increase height, click **Expand**.  To decrease height, click **Collapse**.

**Adding a Mermaid Diagram**

To help with visualizing logic procedures and operations, you can create a Mermaid diagram in several ways:

* **From the context menu:** Click the "+" menu and select **Mermaid** directly — the language is pre-selected.
* **From a code block:** Add a code block, then choose **Mermaid** from the language dropdown.
* **Using Box AI:** Ask Box AI (inline or from the side panel) to generate diagrams and charts for you. You can also highlight a table and ask inline AI to generate a Mermaid pie chart from it.