The following difference covers how npm i and npm ci command are different from each other and their functioning. The npm which is called a node package manager which is used for managing modules needed for our application.
npm i: The npm i (or npm install) is used to install all dependencies or devDependencies from a package.json file.
npm install "package-name" // OR npm i "package-name"
npm ci: CI stands for continuous integration and npm ci is used to install all exact version dependencies or devDependencies from a package-lock.json file.
Differences between npm i and npm ci are:
|1.||It installs a package and all its dependencies.||It is generally used to install dependencies.|
|2.||It may write to package.json or package-lock.json.||It never writes to package.json or package-lock.json.|
|3.||Individual dependencies can be added with this command.||Individual dependencies cannot be added with this command.|
|4.||It is slower in execution.||It is faster in execution.|
|5.||If any dependency is not in package-lock.json, This command will add it.||If any dependencies are missing or have incompatible versions, then npm ci will throw an error.|
|6.||If a node_modules is already present, This Command doesn’t change anything to it.||If a node_modules is already present, it will be automatically removed before npm ci begins its install.|
|7.||It can install global packages.||It can not install global packages.|
|8.||The npm i package-name is used to right to package.json to add or update dependencies.||It can’t be used to write to package.json.|
|9.||npm i may right to package-lock.json to lock version of some dependencies.||It can’t write to package-lock.json.|
|10 .||Used during development after pulling changes that update the list of dependencies.||Used for the deterministic, repeatable build.|