Remove extra spaces in string JavaScript?

To remove extra spaces from strings in JavaScript, you can use several methods depending on your needs. Here are the most common approaches.

Remove All Spaces

To remove all spaces from a string, use the replace() method with a regular expression:

var sentence = "My name is John Smith ";
console.log("Original string:");
console.log(sentence);

var noSpaces = sentence.replace(/\s+/g, '');
console.log("After removing all spaces:");
console.log(noSpaces);

Original string:
My name is John Smith 
After removing all spaces:
MynameisJohnSmith

Remove Leading and Trailing Spaces

Use trim() to remove spaces only from the beginning and end:

var sentence = "   My name is John Smith   ";
console.log("Original string:");
console.log('"' + sentence + '"');

var trimmed = sentence.trim();
console.log("After trim():");
console.log('"' + trimmed + '"');

Original string:
"   My name is John Smith   "
After trim():
"My name is John Smith"

Remove Extra Spaces Between Words

To collapse multiple spaces into single spaces while keeping words separated:

var sentence = "My    name     is   John    Smith";
console.log("Original string:");
console.log(sentence);

var normalized = sentence.replace(/\s+/g, ' ').trim();
console.log("After normalizing spaces:");
console.log(normalized);

Original string:
My    name     is   John    Smith
After normalizing spaces:
My name is John Smith

Method Comparison

Conclusion

Choose the method based on your needs: replace(/\s+/g, '') for complete removal, trim() for edge cleanup, or replace(/\s+/g, ' ').trim() for normalizing multiple spaces to single spaces.