Naming variables in JavaScript

David Y.

The problem

How should I name the variables in my JavaScript code?

The solution

  • Variable names must start with a letter, an underscore (_) or a dollar sign ($).
  • Variable names cannot contain spaces.
  • Variables cannot be the same as reserved keywords such as if or const.
  • By convention, JavaScript variable names are written in camelCase.
  • Variables should be given descriptive names that indicate their content and usage (e.g. sellingPrice and costPrice rather than x and y).
  • As JavaScript variables do not have set types, it can be useful to include an indication of the type in the name (e.g. orderNumber is obviously a numeric ID, whereas order could be an object, a string or anything else).

Get Started With Sentry

Get actionable, code-level insights to resolve JavaScript performance bottlenecks and errors.

  1. Create a free Sentry account

  2. Create a JavaScript project and note your DSN

  3. Grab the Sentry JavaScript SDK

<script src=""></script>
  1. Configure your DSN
Sentry.init({ dsn: 'https://<key><project>' });

Loved by over 4 million developers and more than 90,000 organizations worldwide, Sentry provides code-level observability to many of the world’s best-known companies like Disney, Peloton, Cloudflare, Eventbrite, Slack, Supercell, and Rockstar Games. Each month we process billions of exceptions from the most popular products on the internet.

Share on Twitter
Bookmark this page
Ask a questionJoin the discussion

Related Answers

A better experience for your users. An easier life for your developers.

© 2024 • Sentry is a registered Trademark
of Functional Software, Inc.