CODE EXAMPLE FOR JAVASCRIPT

npm what package-lock.json is for

cases                                | npm install | npm ci
 --------------------------------------|-------------|-------------
  needs package.json                   | no          | yes
  needs package-lock.json              | no          | yes
  installs from package.json           | yes         | no
  installs from package-lock.json      | no          | yes
  compares both                        | no          | yes
  updates loose package versions       | yes         | no
  updates loose dependencies           | yes         | no
  writes to package.json               | yes         | no
  writes to package-lock.json          | yes         | no
  deletes node_modules before install  | no          | yes
  used for installing separate package | yes         | no
  should be used on build systems / CI | no          | yes
  can be used for development          | yes         | yes
  reproducible installs                | no          | yes