# JavaScript Variable Naming Rules and Conventions

> Follow JavaScript variable naming rules: start with a letter, underscore, or dollar sign, use camelCase, and choose descriptive names that indicate content

**URL:** https://sentry.io/answers/naming-variables-in-javascript/

---

## 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).

---

*Source: [sentry.io/answers/naming-variables-in-javascript/](https://sentry.io/answers/naming-variables-in-javascript/)*