Update Documents in MongoDB

// Update one document
db.users.updateOne(
  { email: "john@example.com" },
  { $set: { age: 31, modified: new Date() } }
)

// Update multiple documents
db.users.updateMany(
  { status: "inactive" },
  { $set: { status: "archived" } }
)

// Update or insert (upsert)
db.users.updateOne(
  { email: "new@example.com" },
  { $set: { name: "New User", age: 25 } },
  { upsert: true }
)