Check if String contains Whitespace in JavaScript

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Borislav Hadzhiev

Last updated: Jul 27, 2022

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Check if String contains Whitespace #

Use the test() method to check if a string contains whitespace, e.g. /\s/.test(str). The test method will return true if the string contains at least one whitespace character and false otherwise.

index.js
function containsWhitespace(str) { return /\s/.test(str); } console.log(containsWhitespace(' ')); // 👉️ true console.log(containsWhitespace('hello world')); // 👉️ true console.log(containsWhitespace('')); // 👉️ false console.log(containsWhitespace('test')); // 👉️ false

We used the RegExp.test method to check if a string contains whitespace.

The test method returns true if the regular expression is matched in the string and false otherwise.

The forward slashes / / mark the start and end of the regular expression.

The \s character is used to match spaces, tabs and newlines.

If you ever need help reading a regular expression, check out this regex cheatsheet from MDN.

Our regular expression checks for all types of whitespace characters, including tabs \t and newlines \n.

index.js
function containsWhitespace(str) { return /\s/.test(str); } console.log(containsWhitespace('hello\tworld')); // 👉️ true console.log(containsWhitespace('hello\nworld')); // 👉️ true

Further Reading #

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