Log a variable to the console using conditional breakpoints

Written byPhuoc Nguyen

Tags

DevTools

Created

01 Mar, 2021

Sometimes it's not possible for us to log data to the Console directly in the code. For example, when we debug codes coming from external libraries.

Perform the steps below to print the variable:

Open the Chrome DevTools, and activate the Sources tab
Navigate to the line of a given function that you want to log the data
Right-click the line number, and choose Add conditional breakpoint ... from the context menu
Enter the condition

console.log('replace-it-with-your-variable');

When the associcate line is hit by the debug process, it will try to evaluate the condition meaning that the variable is printed out.

The nice thing is that the script execution on the page is still being processed because the condition never happens (the `console.log` function returns `undefined`).

In the following screenshot, the `params` variable is logged to the Console when the `sum` function is invoked.

#See also

Questions? 🙋

Do you have any questions? Not just about this specific post, but about any topic in front-end development that you'd like to learn more about? If so, feel free to send me a message on Twitter or send me an email. You can find them at the bottom of this page.

I have a long list of upcoming posts, but your questions or ideas for the next one will be my top priority. Let's learn together! Sharing knowledge is the best way to grow 🥷.

Newsletter 🔔

If you're into front-end technologies and you want to see more of the content I'm creating, then you might want to consider subscribing to my newsletter.

By subscribing, you'll be the first to know about new articles, products, and exclusive promotions.

Don't worry, I won't spam you. And if you ever change your mind, you can unsubscribe at any time.

Phước Nguyễn

Log a variable to the console using conditional breakpoints

#See also

Questions? 🙋

Recent posts ⚡

Newsletter 🔔