is-number
Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.
npm says
224,741,580
per week
Every tarball fetch: mirrors, scanners, CI and people.
real installs
high confidence≈ 225M
per week
Mirror spikes and crawlers removed. CI and dependency installs still count, so this is not a head count.
noise under 1% of npm's count, so nearly all of it counts. noise real installs
Why this estimate
With JavaScript on, this lists what the filter found for this package.
Most used major version: 7, the latest one, with 87% of last week's downloads above the crawler floor. Most used single version: 7.0.0.
Snapshot from the daily build of Nov 6, 2026, last 7 days of npm data. With JavaScript on, this page recomputes it live from the npm API.
How many people use is-number?
npm counted 224,741,580 downloads of is-number in the last 7 days. Nobody can count people exactly, npm included: it does not record who downloaded what. After removing mirror spikes and crawlers, about 225M look like real installs. At this scale most of them come from CI, builds and other packages that depend on is-number, so the number of people behind them is far smaller.
Is is-number still maintained?
Probably not actively: there has been no release in over a year, though that can also mean it is simply finished. The latest version, 7.0.0, came out on Jul 4, 2018. There were no stable releases in the last 12 months. It was first published on Sep 22, 2014. npm lists 3 maintainers.
Is is-number still used?
Downloads with publish spikes removed are up 26% over 3 months and up 104% over 11 months. For scale, the median of the 269 packages we track, which lean towards today's most downloaded, is up 157% over 11 months, so this one is behind that. Last week, 87% of downloads above the crawler floor were on major version 7, the latest one; the most used single version was 7.0.0, with 87%. Weekdays get 1.4× the downloads of weekends, which fits people at work, though CI follows the same rhythm. Crawlers account for about 1,851 downloads a week, roughly 123 per version.
Where do the downloads of is-number come from?
Probably mostly through other packages. Each package below requires the one above it, and their weekly downloads on the matching versions line up within about 30%. This is an inference from download counts, not something npm records.
- is-number 7.0.0 225M a week
- to-regex-range 5.0.1 211M a week
- fill-range 7.1.1 217M a week
- braces 3.0.3 218M a week
Past braces the trail splits or we can't follow it. These are still real installs, but the people running them may never have chosen is-number. How a package ends up like this.
How the estimate works
- Cut the spike every new version gets from mirrors in its first days.
- Subtract the flat floor robots download from every version each week.
- Show what is left as a range, with a confidence level. It still includes CI and dependency installs, so it is not a count of people.