Package

is-lower-case

Returns `true` if the string is lower case only

v3.0.0, 30 Sept 2023MITESM onlyTypes: None

$ npm install is-lower-case

npm GitHub Homepage

Deprecated on npm

Use `input.toLowerCase() === input`

Key numbers

As of 25 Sept 2026

Weekly downloads: 6.6m; +31% over 12 months
Gzip bundle size: -; No Bundlephobia data
Dependencies: 0; Direct, from package.json
Last release: 2 years ago; v3.0.0
GitHub stars: -
Open issues / PRs: - / -
Contributors: 25
Commits, last 52 weeks: -

Downloads

Last week 2026-09-15 to 2026-09-21

Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

6,551,319 downloads last week, 33,377,990 in the last month. The 12-month change of +31% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months: 010 in total
Latest version: 3.0.0, 30 Sept 20232 years ago
First published: 25 Apr 2014
Last push to GitHub: -
Repository archived: -
Open issues: -
Open pull requests: -
Commits, last 52 weeks: -
Dependents on npm: -

Major versions

v3 first release 3.0.0, 30 Sept 2023
v2 first release 2.0.0, 1 Dec 2019
v1 first release 1.0.0, 17 Aug 2014
v0 first release 0.0.1, 25 Apr 2014

Recent releases

Version	Published
3.0.0	30 Sept 2023
2.0.2	2 Dec 2020
2.0.1	6 Dec 2019
2.0.0	1 Dec 2019
1.1.3	16 Dec 2015
1.1.2	16 Dec 2015
1.1.1	8 Feb 2015
1.1.0	12 Jan 2015
1.0.0	17 Aug 2014
0.0.1	25 Apr 2014

Compatibility

Module format: ESM onlyFrom package.json type, main and exports fields
TypeScript types: None
Node.js engine range: Not declared
Runtimes: -
Unpacked size (npm): 2.3 kB
Dependencies (0): None

Install

npm install is-lower-case

CDN

jsDelivrhttps://cdn.jsdelivr.net/npm/is-lower-case@3.0.0/
unpkghttps://unpkg.com/is-lower-case@3.0.0/
esm.shhttps://esm.sh/is-lower-case@3.0.0

Sources: npm registry, npm downloads API. Data fetched 25 Sept 2026.

Indexability: Not indexed (discovery only): deprecated; GitHub data not fetched yet; no category.