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Main entry point does not exist

If you get an error in the deploy log that says that your package.json points to a file that does not exist, here is how to fix it.

Error message​

ERROR: The main entry point defined in package.json 'index.js' does not exist.

https://docs.npmjs.com/cli/v8/configuring-npm/package-json#main
  
  "main": "index.js"

To fix do the following:
- update the entry in package.json that points to the correct file:

  "main":"./some_folder/some_file.js",

Solution​

Cyclic launches your code by running node .. By default this will look for a main entry in your package.json. If that entry does not exist it will then default to server.js.

Either you can define a main entry that points to your entry point - for example:

{
  "main": "src/index.js",
  ...
}

Or, you can ensure the entry point to your Express application is a server.js file in the root directory.

Why does this happen?​

By default when you run npm init it creates a main entry in package.json which points to index.js. Most frameworks init their entry points in files other than index.js in the root directory. Hence the mismatch in default behavior.