I downloaded a theme and it has a package-lock.json file but no package.json file. Is there a way I can generate the package.json from the package-lock.json file. How do I install the node modules with just the package-lock.json file. Is there a way to do that?
Install the latest npm with npm install -g npm
Run npm init and respond to the questions.
The above command will generate a package.json and include the existing packages listed in package-lock.json
package-lock.json file relies on the presence of a package.json file, So it's not possible to retrieve package.json (happy to be proved wrong).
So a possible solution left is to use a module like auto-install which is capable of generating package.json from the project file dependencies.
First, you need to install the module globally npm install -g auto-install. Then run npm init and answer the basic requirements.
Then, run auto-install in your project root directory. All the dependencies should reflect in package.json file.
**
Or Install node modules directly from package-lock.json
**
Run npm ci which bypasses a package’s package.json to install modules from a package’s lockfile.
I think I figured it out.
I don't think npm init can draw from package-lock.json. However it does seem to pull from what is already in your /node_modules. I believe this is why @Harry B's solution works for some and not at all for others.
For example, if you have just cloned your project which contains package-lock.json, no package.json, and empty/non-existence node_modules, npm init won't create any dependencies. However, if you run npm install pkg1 pkg2 pkg3 ... then run npm init it will create the dependencies in package.json.
来源：https://stackoverflow.com/questions/50038891/create-package-json-from-package-lock-json