Package

flatten

Flatten arbitrarily nested arrays into a non-nested list of non-array items. Maintained for legacy compatibility.

v1.0.3, 31 Oct 2019MIT-Types: None

$ npm install flatten

npm GitHub Homepage

Deprecated on npm

flatten is deprecated in favor of utility frameworks such as lodash.

Key numbers

As of 25 Sept 2026

Weekly downloads: 3.5m; +2% over 12 months
Gzip bundle size: -; No Bundlephobia data
Dependencies: 0; Direct, from package.json
Last release: 6 years ago; v1.0.3
GitHub stars: 5; 3 forks
Open issues / PRs: 4 / 0
Contributors: -
Commits, last 52 weeks: 0

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.

3,511,836 downloads last week, 11,479,214 in the last month. The 12-month change of +2% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months: 06 in total
Latest version: 1.0.3, 31 Oct 20196 years ago
First published: 28 Jun 2012
Last push to GitHub: 31 Oct 20192,520 days before the snapshot
Repository archived: No
Open issues: 4
Open pull requests: 0
Commits, last 52 weeks: 0
Dependents on npm: -

Major versions

v1 first release 1.0.0, 20 Jan 2016
v0 first release 0.0.0, 28 Jun 2012

Recent releases

Version	Published
1.0.3	31 Oct 2019
1.0.2	20 Jan 2016
1.0.1	20 Jan 2016
1.0.0	20 Jan 2016
0.0.1	28 Jun 2012
0.0.0	28 Jun 2012

Compatibility

Module format: -Not determined from package.json
TypeScript types: None
Node.js engine range: Not declared
Runtimes: -
Unpacked size (npm): 3.6 kB
Dependencies (0): None

Install

npm install flatten

CDN

jsDelivrhttps://cdn.jsdelivr.net/npm/flatten@1.0.3/
unpkghttps://unpkg.com/flatten@1.0.3/
esm.shhttps://esm.sh/flatten@1.0.3

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

Indexability: Not indexed (discovery only): deprecated; no category.