String.prototype.charCodeAt() - JavaScript | MDN

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String.prototype.codePointAt()

The charCodeAt() method of String values returns an integer between 0 and 65535 representing the UTF-16 code unit at the given index.

Converted to an integer

Zero-based index of the character to be returned. Converted to an integer — undefined is converted to 0.

UTF-16 characters, Unicode code points, and grapheme clusters

Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character in a string called str is str.length - 1.

String.fromCharCode()

String.prototype.charAt()

String.fromCodePoint()

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This page was last modified on Jul 10, 2025 by MDN contributors.

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