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What is the difference between `npm ci` and `npm install`?

Q: What is the difference between `npm ci` and `npm install`?

**TL;DR.** npm install **resolves** dependencies from package.json and may **update** package-lock.json and node_modules incrementally. npm ci does a **clean, deterministic** install: it deletes node_modules , installs **exactly** what the lockfile says, and **fails** if the lockfile and package.json disagree. Use ci in CI/CD. npm install resolves ranges may edit lockfile incremental <rect class='d-box-accent' x='

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Reproducible CI installs vs dependency resolution.

nodejsnpmcilockfile

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CI pipeline step

# Reproducible, fast, fails if lockfile is out of date:
npm ci --omit=dev

# Local development, adds a package and updates the lockfile:
npm install zod

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How do you validate and sanitize request input (zod / joi)?

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