[object PointerEvent]

✅ Answer

[object PointerEvent] is the default string form of a JavaScript PointerEvent object (you see it when the event is coerced to a string); to inspect the actual data, log the event object or read its properties like pointerId, clientX, clientY, pointerType, etc.

🔢 Step-by-Step Solution

1. Add a pointer event listener and log the event object (best for devtools inspection):

element.addEventListener('pointerdown', e => {
  console.log(e);        // shows expandable object in DevTools
  console.dir(e);        // shows object properties in detail
});

1. Don’t coerce the event to a string (this produces "[object PointerEvent]"):

element.addEventListener('pointerdown', e => {
  alert(e);              // shows "[object PointerEvent]"
  console.log('' + e);   // also prints "[object PointerEvent]"
});

1. Read specific properties directly:

element.addEventListener('pointerdown', e => {
  console.log('id:', e.pointerId, 'x:', e.clientX, 'y:', e.clientY, 'type:', e.pointerType, 'pressure:', e.pressure);
});

1. If you want a JSON-ish snapshot of useful fields:

element.addEventListener('pointerdown', e => {
  console.log(JSON.stringify({
    pointerId: e.pointerId,
    clientX: e.clientX,
    clientY: e.clientY,
    pointerType: e.pointerType,
    pressure: e.pressure
  }));
});

1. To enumerate available property names (including prototype names):

element.addEventListener('pointerdown', e => {
  console.log(Object.getOwnPropertyNames(e)); // own properties
  console.log(Object.getOwnPropertyNames(Object.getPrototypeOf(e))); // prototype properties
});

💡 Explanation

• When a JavaScript object is coerced to a string (for example via alert() or string concatenation), the runtime calls its toString() behavior, which for DOM events produces "[object PointerEvent]".
• DevTools console.log(event) shows an interactive object you can expand to inspect properties. console.dir(event) gives a clearer property view.
• A PointerEvent is the unified DOM event type for mouse, touch, and pen input; it exposes properties such as pointerId, coordinates (clientX, clientY), pointerType ("mouse", "touch", "pen"), pressure, tiltX, and tiltY.

📌 Key Points

• [object PointerEvent] = stringified PointerEvent, not an error.
• Use console.log(event) or console.dir(event) to inspect the object in DevTools.
• Read properties like pointerId, clientX, clientY, pointerType, pressure to get useful data.
• To serialize, pick the fields you need (e.g., via JSON.stringify({...})) because the event object itself may not be directly serializable.