NodeJS : Heroku web: npm ERR! missing script: start

NodeJS : Heroku web: npm ERR! missing script: start
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Next, enter the letters 'awesome' on your keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

Here's a brief description of who I am,
Greetings, my name is Delphi.
Allow me to support you in answering your questions.
NodeJS : Heroku web: npm ERR! missing script: start
Please feel free to comment or chat with me for more detailed information.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
Providing an answer will be acknowledged and appreciated with a 'heart' from me.
start Heroku web: missing NodeJS script: : ERR! npm