Session Info

The Session Info node is a widget for Node-RED Dashboard 2 that displays session statistics and error information with interactive dialogs for detailed analysis. It presents an overview with the total counter, the error/anomaly counter, the status of the last result and the detailed error breakdown.

Clicking the error counter opens a dialog with a table showing the error breakdown. It supports both a simple format ({"error_name": count}) and a complex one ({"error_name": {"metric1": value1}}), with automatic detection of the table columns. It also includes session performance metrics with a timing breakdown.

Features

• Session overview: status of the last result (OK/NOK), total counter and error/anomaly counter.
• Detailed error analysis: interactive error counter dialog with a table view.
• Performance monitoring: session performance metrics with a timing breakdown.
• Customisable labels: every displayed label can be customised.
• Real-time updates: automatic data refresh from the incoming messages.
• Reset function: clears the session data through the reset command.

Configuration

Property	Description	Default
Name	Node name shown in the editor.	''
Group	Dashboard group where the widget is displayed.	(required)
Size	Widget width and height (0 = fit automatically to the group).	0 / 0
No Class Label	Label of the error counter field (text of the noClassCounter card).	'Errors'
Param Label	Label of the first column of the error table (error name).	'Errors'
Counter Label	Label of the second column of the error table (count).	'Count'
Last Result Label	Label of the last result field.	'Last result'
Card Title	Title of the session details card.	'Session Details'

Input

This node has 1 input. It is processed according to the contents of msg.payload.

Session data. When msg.payload is an object, it updates the statistics displayed by the widget:

Property	Type	Description
isAnomalous	boolean	Indicates whether an anomaly was detected.
tag	string	Result label.
totalCounter	number	Total number of predictions or items.
anomalyCounter	number	Number of anomalies or errors. In the legacy format it is called noClassCounter.
errorCounter	object	Detailed error breakdown. Each entry can be a number or an object with additional metrics, such as count and severity.
performance	object	Performance metrics. milliseconds is the total processing time; jimp_read, convert and classify break down the loading, conversion and classification of the image.

msg.payload = {
    isAnomalous: true,
    tag: "NOK",
    totalCounter: 150,
    anomalyCounter: 12,
    errorCounter: {
        "Label Misaligned": 5,
        "Insufficient Contrast": 3,
        "Blur Detection": {
            count: 4,
            severity: 0.8
        }
    },
    performance: {
        milliseconds: 1250,
        jimp_read: { milliseconds: 150 },
        convert: { milliseconds: 200 },
        classify: { milliseconds: 900 }
    }
};

Reset. When msg.payload is the string "reset", all the session data is cleared:

msg.payload = "reset";

Output

This node does not emit messages. It is a display-only component that shows the session information.

Usage example

Send an object with the session data to update the overview and the error breakdown:

msg.payload = {
    isAnomalous: true,
    tag: "NOK",
    totalCounter: 150,
    anomalyCounter: 12,
    errorCounter: {
        "Label Misaligned": 5,
        "Insufficient Contrast": 3,
        "Blur Detection": 4
    },
    performance: {
        milliseconds: 1250,
        jimp_read: { milliseconds: 150 },
        convert: { milliseconds: 200 },
        classify: { milliseconds: 900 }
    }
};
return msg;

To clear the accumulated statistics, send the reset command:

msg.payload = "reset";
return msg;