36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
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title: Use the JavaScript Console
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---
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Both Chrome and Firefox have excellent JavaScript consoles, also known as DevTools, for debugging your JavaScript.
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You can find Developer tools in your Chrome's menu or Web Console in FireFox's menu. If you're using a different browser, or a mobile phone, we strongly recommend switching to desktop Firefox or Chrome.
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You can also use <a href='https://repl.it/' target='_blank' rel='nofollow'>https://repl.it/</a> to run code online.
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This is how you print to the console:
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console.log('Hello world!')
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Also You can print an error log in the console with this code:
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console.error('I am an error!')
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Or you can print warning logs with the following code:
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console.warn('I am a warning!')
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If you want to group multiple console messages, you can use the `console.group`:
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console.group();
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console.log('Nothing happend yet...');
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console.log('Yet nothing to report');
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console.warn('Warning! Something went wrong');
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console.groupEnd();
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console.error('I am not part of the group');
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Above example of the group is not collapsed by default, if you want to, use `console.groupCollapsed` instead.
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#### More Information
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- <a href="https://developer.mozilla.org/en-US/docs/Web/API/Console" target="_blank" rel="noopener noreferrer">MDN</a>
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