Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

// find with filter, projection, sort, and pagination
const users = await db.collection('users')
  .find(
    { age: { $gte: 18 } },          // filter
    { projection: { name: 1, email: 1, _id: 0 } }  // projection
  )
  .sort({ name: 1 })   // ascending by name
  .skip(0)             // pagination offset
  .limit(20)           // page size
  .toArray()

// findOne — returns first match or null
const user = await db.collection('users').findOne({ email: "carol@example.com" })

// deleteOne — remove first matching document
const del = await db.collection('users').deleteOne({ email: "old@example.com" })
console.log('Deleted:', del.deletedCount)

// deleteMany — remove all matches
await db.collection('logs').deleteMany({ createdAt: { $lt: new Date('2023-01-01') } })

// findOneAndUpdate — atomic fetch + update (returns updated doc)
const updated = await db.collection('tasks').findOneAndUpdate(
  { status: "pending" },
  { $set: { status: "processing", startedAt: new Date() } },
  { returnDocument: "after", sort: { priority: -1 } }
)