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Adding custom columns in Burp Logger

• Last updated: June 12, 2025

• Read time: 3 Minutes

You can use Java-based Bambdas to add powerful custom columns to the Burp Logger table. Custom columns enable you to see more detail about the items that have been logged for a more focused analysis.

You can apply custom column Bambdas in two ways:

• Load existing Bambdas - Load Bambdas from your Bambda library.

• Create new Bambdas - Write and apply Bambdas directly in the Add custom column window.

Keyboard shortcuts

To speed up your workflow when creating or loading Bambdas, you can use the following keyboard shortcuts:

• Save - Ctrl + S or Cmd + S

• Save as - Ctrl + Shift + S or Cmd + Shift + S

• Create new Bambda - Ctrl + N or Cmd + N

• Load recent Bambda - Ctrl + O or Cmd + O

Loading Bambdas from your library

You can load and apply Bambdas that are stored in your library to add custom columns to the Logger table.

To load a Bambda from your library:

1. In Logger, click the options menu > Add custom column. The Add custom column window opens.

2. Click Load.

3. Select a recent Bambda from the list.

4. If the Bambda you want to load isn't in the list, click View all to view all Bambdas stored in your library.

   1. Select a Bambda.
   2. Click Load.

5. [Optional] If required, edit the Bambda:

   1. Make your changes.

   2. Click Apply to compile and test the Bambda. Fix any errors shown in the Compilation errors panel. For more information, see Troubleshooting Bambdas.

   3. Save your changes:

      • To overwrite the existing Bambda, click Save to library > Save.

      • To save a new version, click Save to library > Save as.

6. Enter a name for your column in the Column header field.

7. Click Apply & close.

Creating custom Bambdas

You can write your own Bambdas directly in the Add custom column window, using built-in templates or from a blank definition.

Two objects of the Montoya API are available to help you write your Bambda:

• LoggerHttpRequestResponse

• Utilities

To create a custom column for your Logger table:

1. In Logger, click the options menu > Add custom column. The Add custom column window opens.

2. If you want to create your Bambda from a built-in template, select New > From template. Select a template from the list, then click Create using this template.

3. Enter a name for your column in the Column header field.

4. Write a Bambda using Java to specify the data that the custom column displays.

5. Click Apply to compile and test the Bambda. Fix any errors shown in the Compilation errors panel. For more information, see Troubleshooting Bambdas.

6. [Optional] Click Save to library > Save. The Bambda is saved to your Bambda library for future use across Burp.

7. Click Apply & close.

Example Bambda

In the example below, we'll write a Bambda to create a custom column containing the Server header value of the response.

if (!requestResponse.hasResponse()) { return ""; } var response = requestResponse.response(); return response.hasHeader("Server") ? response.headerValue("Server") : "";