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

# Filtering Application Data

To help you find the cause of an issue, AppSignal gathers relevant error and performance measurement data by default.
In some instances, your AppSignal integration may be collecting too much or too little app-specific data.

<Warning>
  Your application should not collect user-identifiable information (such as
  personal names, email addresses, passwords, etc.). Use the tools described in
  this guide to limit and filter out this data.
</Warning>

You can configure AppSignal what kind of data it should not collect by filtering parameters, headers and session data:

* [Filter request parameters](/guides/filter-data/filter-parameters)
* [Filter request headers](/guides/filter-data/filter-headers)
* [Filter session data](/guides/filter-data/filter-session-data)
* [Filter function parameters](/guides/filter-data/filter-function-parameters)

You can also configure AppSignal to ignore certain actions, errors, log messages and namespaces, based on their name or contents:

* [Ignore actions](/guides/filter-data/ignore-actions)
* [Ignore errors](/guides/filter-data/ignore-errors)
* [Ignore logs](/guides/filter-data/ignore-logs)
* [Ignore namespaces](/guides/filter-data/ignore-namespaces)