ajv
Another JSON Schema Validator
npm says
518,007,029
per week
Every tarball fetch: mirrors, scanners, CI and people.
real installs
high confidence≈ 518M
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: 8, the latest one, with 53% of last week's downloads above the crawler floor. Most used single version: 8.20.0.
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 ajv?
npm counted 518,007,029 downloads of ajv 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 518M look like real installs. At this scale most of them come from CI, builds and other packages that depend on ajv, so the number of people behind them is far smaller.
Is ajv still maintained?
Less clear: the last release is more than six months old. The latest version, 8.20.0, came out on Apr 24, 2026. The last 12 months saw 4 stable releases, typically 6 days apart. It was first published on May 29, 2015. npm lists 2 maintainers.
Is ajv still used?
Downloads with publish spikes removed are up 36% over 3 months and up 187% 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 ahead of that. Last week, 53% of downloads above the crawler floor were on major version 8, the latest one; the most used single version was 8.20.0, with 30%. Weekdays get 1.4× the downloads of weekends, which fits people at work, though CI follows the same rhythm. Crawlers account for about 8,616 downloads a week, roughly 24 per version.
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.