What is package-lock.json?

Locks dependency versions.

package.json:

json

{
  "dependencies": {
    "express": "^4.18.0"  // Can install 4.18.x
  }
}

package-lock.json:

json

{
  "express": {
    "version": "4.18.2"  // Exact version locked
  }
}

Ensures everyone gets same versions!

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