find and findone operations in mongodb code example

Example 1: and operation mongodb find

db.inventory.find( { $and: [ { price: { $ne: 1.99 } }, { price: { $exists: true } } ] } )

Example 2: mongodb findone

itemsCollection.findOne(query, projection)
  .then(result => {
    if(result) {
      console.log(`Successfully found document: ${result}.`);
    } else {
      console.log("No document matches the provided query.");
    }
    return result;
  })
  .catch(err => console.error(`Failed to find document: ${err}`));