Lumberjack is an open source log viewer for reading exceptions and traces written to Microsoft Application Insights.

The app gives you a graphical interface to view, navigate and query your logs.

It will give you an overview of your logs with a chart that shows you amount of traces vs errors & warnings. .

• Fast Querying - Lumberjack runs the queries on your Microsoft Application Insights over rest.
• Fast rendering - We use backgroundworkers to parse the query result and to make sure the UI allows smooth scrolling through thousands of rows.
• Graph overview so you can easily spot outliers and context.
• Support for hashtags - if your trace message contains #something you can click and immediately search for the hasthag.
• Select & grep - Select any text and hit ctrl+enter to grep for that text.
• Search/filter property - Filter for any property, e.g. client_City:Dublin.
• Exclude filter - use - to exclude logs from your search, e.g. -client_City:Dublin.
• Auto refresh mode - Automatically refresh the logs every 60 seconds, perfect for dashboard screens.
• Clickable OperationID - to quickly view related logs and errors.
• Supports multiple App insights apps

• enter: Refresh/run the query
• shift+left: Go back in the query history (Also available through browser back button)
• shift+right: Go forward in query history
• ctrl+enter: Grep with currently selected text
• ctrl+click: Open details view for row by ctrl+clicking on it

Lumberjack allows you to inject custom query text to the @@-property or the shorthand @ for simple customdimension properties.
For example:

• @@:"duration > 100"
• @@:"customDimensions.elapsedMilliseconds >= 900"
• @@:"customDimensions['elapsed'] > 100 and customDimensions['requestVerb'] == 'POST'"

Since filtering on custom dimensions is common, it has a shortcut: @:"elapsedMilliseconds >= 900". This shortcut will only work for simple scenarios where you filter on one condition and the customDimension-name does not include spaces. For advanced custom querying, use the @@-syntax.

Examples of customdimension queries:

• @:"elapsed > 100"
• @:"CorrelationId == 'abc'"
• @:"CorrelationId startswith 'x1'"

1. Clone the repo
2. Install dependencies with yarn
3. Run yarn start.
4. Enter your Application Insights AppID and API key in settings.