Introduction
There are certain keywords that you cannot use in Javascript. Below you will find a list of all reserved keywords.
Prerequisites
- A familiarity with the Javascript programming language. Visit our tutorial series, How To Code in Javascript, to learn the basics.
Reserved Keywords in Javascript
Here are keywords that you can’t use in JavaScript for variable names and identifiers:
await, break, case, catch, class, const, continue, debugger, default, delete, do, else, enum, export, extends, false, finally, for, function, if, implements, import, in, instanceof, interface, new, null, package, private, protected, public, return, super, switch, this, throw, true, try, typeof, var, void, while, with, yield
You should also avoid these HTML event handlers as identifiers:
onblur, onclick, onerror, onfocus, onkeydown, onkeypress, onkeyup, onmouseover, onload, onmouseup, onmousedown, onsubmit
Conclusion
Reserved keywords are an important element in Javascript. For a more comprehensive overview of the programming language, visit our tutorial series, How To Code in Javascript.
Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases.
About the author(s)
Alligator.io is a developer-focused resource that offers tutorials and insights on a wide range of modern front-end technologies, including Angular 2+, Vue.js, React, TypeScript, Ionic, and JavaScript.
Supporting the open-source community one tutorial at a time. Former Technical Editor at DigitalOcean. Expertise in topics including Ubuntu 22.04, Ubuntu 20.04, CentOS, and more.
Still looking for an answer?
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License.
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and SMBs
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Get started for free
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.