How do you update documents in MongoDB?

Call updateMany() with a query selecting the documents and an update object using $set to specify the new field values.

await birthdays.updateMany(
  { name: { $eq: 'Anna' } },
  { $set: { day: new Date('1983-03-21') } }
);

• First parameter: query to select documents (same as find)
• Second parameter: update object with $set specifying new values
• updateMany updates ALL matching documents
• Use updateOne to update only the first match