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

# LaunchDarkly developer toolbar

<View title="Developer" />

<View title="Federal docs" />

<View title="EU docs" />

This category has documentation topics about the LaunchDarkly developer toolbar. The developer toolbar helps with the testing and debugging of feature flags and events in development environments, without affecting the flag variations other members see.

The toolbar lets you:

* View a list of feature flags you're using in your app, and override values locally to test application behavior for flag variations
* Listen to incoming events, including flag evaluation events
* Identify needed feature flags and create them in LaunchDarkly directly from the toolbar
* Specify hosted domains and domains you control as safe for use with the toolbar

<Frame caption="The developer toolbar.">
  <img src="https://mintcdn.com/launchdarkly/YIC2H8XW-fomhquw/images/__LD_UI_no_test/dev-toolbar-json.png?fit=max&auto=format&n=YIC2H8XW-fomhquw&q=85&s=a5e4b02426c3bfa8a4ba42c8c647d208" alt="The developer toolbar." width="794" height="1016" data-path="images/__LD_UI_no_test/dev-toolbar-json.png" />
</Frame>

The topics in this category include:

* [Setting up the developer toolbar](/docs/home/getting-started/dev-toolbar-setup)
* [Using the developer toolbar](/docs/home/getting-started/dev-toolbar-using)