Report on the active layer name, layer itemIndex & layer id value

Active Layer Inspector.jsx

/////////// ACTIVE LAYER INSPECTOR v1.8, 6th January 2022 ///////////
/////////////// Displays info about the current layer ///////////////

/* https://community.adobe.com/t5/photoshop/could-you-select-all-layers-sequentially/m-p/11741392 */

/* Name = Not unique */
/* itemIndex = Changes with layer addition/removal, Background layer index starts at 0 - no Background starts at 1 */
/* layer.id = Unique, Static */

//    Bounds:
//    + - - - - - - - [1] - - - - - - - +
//    |                                 |
//    |                                 |
//   [0]                               [2]
//    |                                 |
//    |                                 |
//    + - - - - - - - [3] - - - - - - - +

#target photoshop

try {
    var savedRuler = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;

    var doc = app.activeDocument;
    var docLayer = doc.activeLayer;
    var layerName = docLayer.name;
    var itemIndex = getActiveLayerIndex();
    var layerID = docLayer.id;
    var typeName = docLayer.typename;
    var Kind = docLayer.kind;
    var bgLayer = docLayer.isBackgroundLayer;
    var Parent = docLayer.parent;
    var clipMask = docLayer.grouped;

    /* https://community.adobe.com/t5/photoshop/find-out-the-size-and-position-of-an-object-in-a-layer/td-p/12057799 */
    var bounds = activeDocument.activeLayer.bounds;

    alert('ACTIVE LAYER INSPECTOR - v1.8' + '\r' + 'Layer Name: ' + layerName + '\r' + 'Layer Item Index #: ' + itemIndex + '\r' + 'Layer ID #: ' + layerID + '\r' + 'Layer Type: ' + typeName + '\r' + 'Layer Kind: ' + Kind + '\r' + 'Parent: ' + Parent + '\r' + 'isBackgroundLayer: ' + bgLayer + '\r' + 'Grouped: ' + clipMask +'\n' + 'Layer Bounds -' + '\r' + 'X1 - [0]: ' + app.activeDocument.activeLayer.bounds[0] + '\r' + 'Y1 - [1]: ' + app.activeDocument.activeLayer.bounds[1] + '\r' + 'X2 - [2]: ' + app.activeDocument.activeLayer.bounds[2] + '\r' + 'Y2 - [3]: ' + app.activeDocument.activeLayer.bounds[3] + '\r' + 'Width: ' + (app.activeDocument.activeLayer.bounds[2] - app.activeDocument.activeLayer.bounds[0]) + '\r' + 'Height: ' + (app.activeDocument.activeLayer.bounds[3] - app.activeDocument.activeLayer.bounds[1]));
    
    app.preferences.rulerUnits = savedRuler;

    function getActiveLayerIndex() {
        /* https://github.com/Paul-Riggott/PS-Scripts/blob/master/getLayersetLayerIDs.jsx */
        var ref = new ActionReference();
        ref.putEnumerated(charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt'));
        try {
            activeDocument.backgroundLayer;
            return executeActionGet(ref).getInteger(charIDToTypeID("ItmI")) - 1;
        } catch (e) {
            return executeActionGet(ref).getInteger(charIDToTypeID("ItmI"));
        }
    };

}
catch (e) {
}