What Is Npm Lock File

What’s a Lock File? A lock file describes the entire dependency tree as it is resolved when created including nested dependencies with specific versions. In npm these are called package-lock. json and in yarn they are called yarn.

What is the purpose of lock file?

Lock files are created by a program when it is necessary to have only one instance of this program running at the same time. Generally, this is to avoid that local files/DB are accessed concurrently because this may corrupt them. This is a marker file used to keep programs from changing a file simultaneously.

Is it OK to delete package lock json?

Conclusion: don’t ever delete package-lock. json . Yes, for first level dependencies if we specify them without ranges (like “react”: “16.12. 0” ) we get the same versions each time we run npm install .