Watch JavaScript values in real time with Live Expressions

Sofia Emelianova
Sofia Emelianova

If you find yourself typing the same JavaScript expression in the Console repeatedly, you might find it easier to create a Live Expression. With Live Expressions, you type an expression once and then pin it to the top of your Console. The value of the expression updates in near real time.

Create a live expression

To pin an expression to the top of the Console:

  1. Open the Console.
  2. Click Create Live Expression. Create Live Expression. The Live Expression text box appears.

  3. Type your expression in the text box. For example, you can use a live expression to track element focus.

    Typing document.activeElement into the Live Expression text box.

  4. Press Enter to save the expression, or click outside of the Live Expression text box.

The value below the pinned expression is its result. The result updates every 250 milliseconds.

Add multiple expressions

To pin multiple expressions in parallel, click the Create a live expression. Create Live Expression button as many times as you need.

You can only see several pinned expressions at a time but you can scroll the expressions list to view all of them.

Scroll the pinned expressions list.

Remove expressions

To remove an expression, click the The Close button.Close button next to it.