Home >Web Front-end >JS Tutorial >How to Determine if a Variable is a String in JavaScript?
In JavaScript, variables can hold different data types, including strings. To determine whether a particular variable contains a string or any other type, you can use the following methods:
Typeof Operator
The typeof operator returns the type of the variable as a string. For strings, it will return the string "string":
<code class="js">if (typeof myVar === 'string') { // myVar is a string }</code>
Instanceof Operator
The instanceof operator checks if the variable is an instance of the String object.
<code class="js">if (myVar instanceof String) { // myVar is a string }</code>
Combined Approach
For more robust checking, you can combine the typeof and instanceof operators as follows:
<code class="js">if (typeof myVar === 'string' || myVar instanceof String) { // myVar is a string }</code>
Additional Considerations
Note that the following values in JavaScript are considered strings:
However, the following values, which may appear like strings, are not considered strings:
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