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In this video.

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Let's go ahead and create a function to connect to MongoDB.

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So inside the config, let's create one file called DB Connect dot JS.

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So let's import the mongoose package and it's equal to required and mongoose.

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So I'm going to be as Kong's DB connect.

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So inside the function body I'm going to make use of try and catch.

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And inside a try, I'm going to connect by making use of a and then mongoose dart connect.

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And this function requires only one argument, and that is the connection string for MongoDB.

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For the meantime, let's add some placeholder and call it as mongo.

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You are ill and I'm going to show you how we're going to get the MongoDB.

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You are error.

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So in case everything goes right inside here, we are going to console.log by saying that DB connected.

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And in case something goes wrong, we are going to console.log this by saying that.

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And I want to add the exact error and we have access on the error message.

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All right.

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The last step is that I need to export this function.

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So I'm going to be as module dot exports and is equal to DV connect.

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But this how I would like to export this function.

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And so this way I'm going to call the function automatically as DB connect.

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So anywhere I require the file, this function is going to run automatically.

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So let me remove this one.

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So let's get back to the server.

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That's where I want to call the DB connection and going to be as required.

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And force last config and then DB connect and that is it.

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So if I check the terminal and here you can see that we have beautiful error by saying that invalid

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scheme meaning that we didn't provide the valid MongoDB you are error.

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So the next video, let's see how we are going to create MongoDB connection in string.