Question 52460 in Javascript Question posted in
A very good W3school tutorial can be found here.

exactly why this error are show i can't understand. this is the mongoose conncetion with node js – Javascript

connection.once(‘open’, () => {console.log(‘DB Connected!’)}).catch((err) => {
^

TypeError: connection.once(…).catch is not a function

This error are shows when server started
enter image description here

I need help to solve this error

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2

Answers


  1. 0

    It looks like the process.env.MONGO_CONNECTION_URL is not a string.

    Typically, when this happens, your environment variable is undefined.

    There are two common places you set your environment variables:

    1. Inside a configuration file
    2. Inside a script in the package.json file

    Based on the error, if the environment variable is not a string, it is likely undefined. If you are setting the environment variable with one of the two methods listed above, be sure it is a string.

    Otherwise, you may not be setting it at all, and in this case, set it in one of those two ways.

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  2. 0

    You should setup dotenv to read env vars (assuming they are in sample.env):

    require('dotenv').config({ path: './sample.env' });

mongoose.connect(...);

    You can install the package with:

    npm i dotenv
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