nodejs modify version number

In a project, we usually need to use version numbers to represent different versions of the project. At the same time, in order to facilitate management and use, it is also necessary to be able to dynamically modify the version number in the code. In nodejs, you can use the npm module to achieve this function.

1. What is a version number?

The version number is an identifier indicating the software version. Version numbers usually consist of three parts: major version number (major), minor version number (minor), and revision number (patch). Major version numbers indicate major updates to the software, minor version numbers indicate minor updates to the software, and revision numbers indicate minor changes such as bug fixes. For example, the version number 1.2.3 means that the major version number is 1, the minor version number is 2, and the revision number is 3.

2. How to use npm module to modify the version number?

npm is the nodejs package manager, which can be used to download, install, update and delete nodejs modules. npm also provides a series of commands to manage local and global nodejs modules. To modify the version number, you need to use the npm version command.

1. Modify the major version number:

Command: npm version major

After executing this command, npm will add the major version number of the current version number. 1, and reset the minor version number and revision number to zero. For example, change the version number 1.2.3 to 2.0.0.

2. Modify the minor version number:

Command: npm version minor

After executing this command, npm will add the minor version number of the current version number. 1, and reset the revision number to zero. For example, change the version number 1.2.3 to 1.3.0.

3. Modify revision number:

Command: npm version patch

After executing this command, npm will increase the revision number of the current version number by 1. For example, change the version number 1.2.3 to 1.2.4.

4. Modify the pre-release version number:

Command: npm version premajor / preminor / prepatch

In addition to the above three ways to modify the version number, npm A more granular way to modify pre-release version numbers is also provided. This method can add a pre-release identifier to the current major version number, minor version number or revision number. For example, change the version number 1.2.3 to 1.3.0-rc.1.

When executing the command npm version premajor / preminor / prepatch, a pre-release ID will be added to the current version number. For example, executing the npm version premajor command will increase the major version number of the version number by 1 and place the pre-release identifier after the major version number. For example, change the version number 1.2.3 to 2.0.0-rc.1.

3. How to get the version number in the code?

In nodejs, you can use the env attribute of the process object to obtain the environment variables of the current process. npm will automatically add a variable named npm_package_version to the environment variable, which is the version number of the current project. The version number can be obtained through process.env.npm_package_version in the code.

For example, the following code can print out the version number of the current project:

console.log("Version: " + process.env.npm_package_version);

4. Summary

Through the npm version command, we can easily modify the version in the nodejs project Number. At the same time, through the env attribute of the process object, you can also get the version number of the current project in the code, which facilitates recording and management. During the development process, rational use of version numbers can improve the efficiency of project version management and reduce error rates.

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