Which one should I pick for a new project?

I can't answer that question directly—it depends entirely on what you're building, and the two repos solve different problems:

• expressjs/express ([package.json:L1-L2]): A web framework for Node.js. Pick this if you're building a web server or REST API.
• iamkun/dayjs ([src/index.js:L1-L11]): A date/time library. Pick this if you need to parse, manipulate, or format dates in JavaScript.

They're not alternatives to each other—they often work together. A typical web project might use Express for routing and Dayjs for handling timestamps.

If you're asking which is more stable/production-ready:

• Express has a strong signal: RepoPilot grades it A (99/100) on architecture, 0 CVEs across all dependencies, and 8.9/10 OpenSSF Scorecard. It's mature and heavily used (69K stars).
• Dayjs data isn't in the repository_data block, so I can't assess its security/architecture posture directly.

What are you trying to build?

FOLLOW_UPS:

• Are you building a web server or API?
• Do you need date/time handling capabilities?
• What's your primary use case?