The JavaScript string.at() method

Q: How do I get the last character of a string?

Use str.at(-1), which counts from the end — cleaner than str[str.length - 1].

Q: What is the difference between at() and charAt()?

For positive indices they're the same. at() also accepts negative indices to count from the end, which charAt() does not.

Method JavaScript All modern browsers Updated June 23, 2026

Quick answer

The at() method returns the character at a given index, and crucially it accepts negative indices. str.at(-1) is the last character — cleaner than str[str.length - 1] or str.charAt(str.length - 1). For positive indices it works like bracket access.

Overview

at() reads a single character from a string by index, with the same headline feature as its array namesake array.at(): it understands negative indices. "hello".at(-1) is "o", "hello".at(-2) is "l" — no more str.length - 1 arithmetic to grab characters from the end.

For non-negative indices it behaves just like bracket access (str[2]) and charAt(). The win is entirely at the end of the string — the last character, the file extension's last letter, the final digit. It returns undefined for an out-of-range index.

It's the modern, readable choice for end-relative character access. One Unicode note shared by all index-based string access: an emoji or astral character spans two UTF-16 units, so at() reads code units, not whole code points — for emoji-safe work, iterate with for...of or spread the string.

Syntax

str.at(index)

"hello".at(0)    // "h"
"hello".at(-1)   // "o"  (last character)
"hello".at(-2)   // "l"

Parameters

The string.at() method accepts the following parameters.

Parameter	Description
`index`	The position to read. Negative values count back from the end (`-1` is the last character).

Example

Live example

<pre id="out" style="font:15px ui-monospace,monospace"></pre>
<script>
  const word = 'JavaScript';

  document.getElementById('out').textContent =
    'first: ' + word.at(0) + '\n' +
    'last:  ' + word.at(-1) + '\n' +
    'prev:  ' + word.at(-2); // first: J / last: t / prev: p
</script>

Best practices

Use str.at(-1) for the last character instead of str[str.length - 1].
For ordinary forward access, bracket notation str[i] is fine.
It returns undefined for out-of-range indices.
For emoji-safe iteration, use for...of or spread, since at() reads code units.

Frequently asked questions

How do I get the last character of a string?

Use str.at(-1), which counts from the end — cleaner than str[str.length - 1].

What is the difference between at() and charAt()?

For positive indices they're the same. at() also accepts negative indices to count from the end, which charAt() does not.

What does string.at() return out of range?

undefined.

Does at() work on arrays too?

Yes — array.at() works the same way for array elements.

Promise.resolve() string.charAt()

References