list2shrink

This is a command line pipe that can be used to automatically generate an npm-shrinkwrap.json file.

Install with npm

Since this is a command line, it should be installed globally:

npm install --global list2shrink

usage

npm list | list2shrink > npm-shrinkwrap.json

You can shinkwrap the versions used in your Node.js project by including a npm-shrinkwrap.json file next to your package.json file. For example, if you have your project working when npm list says this:

However, when you move your project to another location and execute npm install, you get different versions. For example:

Notice the different versions?

You can force the npm install to get the same versions by adding this npm-shrinkwrap.json file in the same directory as your package.json file:

{
  "dependencies": {
    "autoprefixer-core": {
      "version": "5.2.1",
      "from": "autoprefixer-core@5.2.1",
      "dependencies": {
        "browserslist": {
          "version": "0.4.0",
          "from": "browserslist@0.4.0"
        },
        "caniuse-db": {
          "version": "1.0.30000694",
          "from": "caniuse-db@1.0.30000694"
        },
        "num2fraction": {
          "version": "1.2.2",
          "from": "num2fraction@1.2.2"
        },
        "postcss": {
          "version": "4.1.16",
          "from": "postcss@4.1.16",
          "dependencies": {
            "es6-promise": {
              "version": "2.3.0",
              "from": "es6-promise@2.3.0"
            },
            "js-base64": {
              "version": "2.1.9",
              "from": "js-base64@2.1.9"
            },
            "source-map": {
              "version": "0.4.4",
              "from": "source-map@0.4.4",
              "dependencies": {
                "amdefine": {
                  "version": "1.0.1",
                  "from": "amdefine@1.0.1"
                }
              }
            }
          }
        }
      }
    }
  }
}

The problem is that it's a pain in the neck to make that *.json file. So, if you've got your project working and you want to shrinkwrap it, you can use this to generate the npm-shrinkwrap.json file.

Hint: Save your npm list in a file like this:

npm list | NpmList.txt

Later on, you can generate an npm-shrinkwrap.json file like this:

cat NpmList.txt | list2shrink > npm-shrinkwrap.json