# Replace multiple spaces with a single space

Collapse runs of two or more whitespace characters.

Canonical: https://1loc.dev/string/replace-multiple-spaces-with-a-single-space/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function collapseSpaces(text) { return text.replace(/\s\s+/g, ' '); }
```

## Input

```json
"Small   code\n\nworks"
```

## Expected output

```json
"Small code works"
```

## Edge case

Input:
```json
"a\tb"
```
Output:
```json
"a\tb"
```

## Limits

- A single tab or line break is left as it is, as the edge case shows.

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/replace-multiple-spaces-with-a-single-space.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.