1. Delete one
deleteOne removes the first document matching the filter.
db.users.deleteOne({ name: "Ada" })Typorithm · medium
Delete Documents
mongo-deletemongodbdeletefilterssafety
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Full lesson · 8 learning steps Open any exercise for focused practice
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Step 1 of 8 · intro card
Learn Delete Documents
CRUD
deleteOne removes the first match; deleteMany removes all matches. Always pass a scoped filter — an empty filter on deleteMany wipes the entire collection.
deleteOne removes a single matching document; deleteMany removes every document that matches the filter.
The filter is what keeps a delete safe: { name: "Ada" } targets one person, while { active: false } targets a whole class.
Beware the empty filter: db.users.deleteMany({}) deletes every document in the collection — there is no undo.
01
deleteOne removes the first match.
02
deleteMany removes all matches.
03
An empty filter on deleteMany clears the collection.
db.users.deleteOne({ name: "Ada" })
db.users.deleteMany({ active: false })Read the implementation
Connect each part of the code to the concept before you type.
2. Scoped filter
A precise filter limits the delete to exactly the intended document.
{ name: "Ada" }3. Delete many
deleteMany removes every document matching the filter.
db.users.deleteMany({ active: false })4. Bulk filter
This filter selects all inactive users for removal.
{ active: false }A complete learning loop
01
Understand
Read the concept map and follow the code breakdown.
02
Reconstruct
Type the implementation, repair mistakes and work through every recall exercise.
03
Verify
Use the final check without hints; revisit weak concepts in short practice sessions.