function to add data to mongoose database async. return data in javascript

To add data to a mongoose database asynchronously and return the saved data in JavaScript, you can create a function with the following code:

index.tsx
const mongoose = require('mongoose');

// Create a schema for your data
const dataSchema = new mongoose.Schema({
  key1: String,
  key2: Number,
  key3: Boolean
});

// Create a mongoose model based on the data schema
const Data = mongoose.model('Data', dataSchema);

async function saveDataToDB(dataObj) {
  try {
    const newData = new Data(dataObj);
    const savedData = await newData.save();
    return savedData;
  } catch (error) {
    console.error(error);
  }
}

const exampleData = {
  key1: 'value1',
  key2: 42,
  key3: true
};

saveDataToDB(exampleData).then(savedData => {
  console.log(savedData);
}).catch(err => {
  console.error(err);
});
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In this example, we are using async/await to create a function called saveDataToDB that takes an object as an argument representing the data you want to save to your database. The function creates a new Data object and saves it to the database through the save() method. The saved data object is then returned.

You can test the function by calling saveDataToDB and passing in an object with your desired data. The function returns a Promise, so you can either use .then() and .catch() methods to handle the data or await the Promise directly in an async function.

Note that you'll need to set up your MongoDB connection before running this code, using mongoose.connect() and a URI that points to your MongoDB instance.