# Make the first character of a string lowercase

Lowercase only the first character.

Canonical: https://1loc.dev/string/make-the-first-character-of-a-string-lowercase/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function lowercaseFirst(text) { return `${text.charAt(0).toLowerCase()}${text.slice(1)}`; }
```

## Input

```json
"Delivered"
```

## Expected output

```json
"delivered"
```

## Edge case

Input:
```json
""
```
Output:
```json
""
```

## Limits

- charAt works on UTF-16 code units; for text that may start with an emoji, use the code-point version in Decapitalize a string.

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/make-the-first-character-of-a-string-lowercase.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Curated implementation; explicit input contract, edge case and limits. Original MDX retained as inert source evidence.