# Convert a string to camel case

Remove separators and uppercase the character after each one.

Canonical: https://1loc.dev/string/convert-a-string-to-camel-case/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function toCamelCase(text) { return text.trim().replace(/[-_\s]+(.)?/g, (_, char) => char ? char.toUpperCase() : ''); }
```

## Input

```json
"idempotency key"
```

## Expected output

```json
"idempotencyKey"
```

## Edge case

Input:
```json
"--leading"
```
Output:
```json
"Leading"
```

## Limits

- A leading separator uppercases the first letter, as the edge case shows. The first word is otherwise kept as typed.

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/convert-a-string-to-camel-case.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.