moment
Parse, validate, manipulate, and display dates
About
Parse, validate, manipulate, and display dates
Live mirror of the GitHub README. Updated whenever the repo's default branch changes.
Moment.js
A JavaScript date library for parsing, validating, manipulating, and formatting dates.
Project Status
Moment.js is a legacy project, now in maintenance mode. In most cases, you should choose a different library.
For more details and recommendations, please see Project Status in the docs.
Thank you.
Resources
License
Moment.js is freely distributable under the terms of the MIT license.
Quick facts
npm install momentHow Sourcemap Explorer detects moment
We catch moment from two complementary signals: bundled source paths and the embedded package.json. Modern bundlers (webpack, Vite, esbuild, Rollup, Turbopack) preserve the original node_modules/moment/ paths inside the JavaScript sourcemap's sources[] array — that's the canonical signal. When the matching package.json is also captured in sourcesContent[], we read the exact version field — patch number included. No regex guessing, no version inference.
- 1
Confirm the site exposes sourcemaps
In DevTools Network, check the response headers of any application script for `SourceMap` or `X-SourceMap`. Failing that, fetch the script's last 4 KB and look for a `//# sourceMappingURL=` comment.
- 2
Find the package in the bundle
Open DevTools → Network → reload. Click any application script and look at its sourcemap. Inside, search `sources[]` for entries matching `node_modules/moment/` — every match confirms the package is bundled. The matching `sourcesContent[i]` for `node_modules/moment/package.json` gives you the exact installed version.
- 3
Read the version directly from package.json
Run `jq -r '. as $m | $m.sources | to_entries[] | select(.value | endswith("node_modules/moment/package.json")) | $m.sourcesContent[.key] | fromjson | .version' bundle.js.map`. Sourcemap Explorer automates the same query in the popup.
Recent versions
FAQ
What is moment used for?
Parse, validate, manipulate, and display dates
How can I tell if a website is using moment?
Open the page in Chrome with the Sourcemap Explorer extension installed and read the Stack tab. We catch `moment` from two complementary signals: `node_modules/moment/` paths inside the JavaScript sourcemap, and the embedded `package.json` we read for exact-version detection. Without the extension you can do the same lookup manually in DevTools — the steps are listed in the "How Sourcemap Explorer detects" section above.
What is the latest version of moment?
2.30.1, as published on the npm registry. The "Recent versions" table on this page lists the most recent 8 releases with their release dates. Sourcemap Explorer reports the version actually bundled into a site, which can lag the latest release by months on real-world deployments.
Where can I read more?
Project homepage: https://momentjs.com. Source code: https://github.com/moment/moment. Published on npm: https://www.npmjs.com/package/moment. Licensed as MIT.
Keep reading on Sourcemap Explorer
Practical guides
Detection deep dives
Detected by Sourcemap Explorer
When a bundle ships sourcemaps, we read the embedded package.json for moment and report the precise version. Without sourcemaps, an import / require in the page's scripts is enough to flag it.