How to Delete All Documents in MongoDB Quickly and Safely

To delete all documents in a MongoDB collection, use the deleteMany({}) method with an empty filter object. This command removes every document but keeps the collection itself intact.

Syntax

The basic syntax to delete all documents in a MongoDB collection uses the deleteMany() method with an empty filter {}. This means no condition is set, so all documents match and get deleted.

• db.collection.deleteMany({}): Deletes all documents in the specified collection.

mongodb

db.collection.deleteMany({})

Example

This example shows how to delete all documents from a collection named users. After running the command, the collection remains but is empty.

mongodb

use myDatabase

// Delete all documents from the 'users' collection
db.users.deleteMany({})

Output

{ "acknowledged" : true, "deletedCount" : 5 }

Common Pitfalls

One common mistake is using deleteOne({}) which deletes only a single document, not all. Another is accidentally dropping the collection with drop() when you only want to clear documents.

Always double-check your filter. Using {} deletes everything, so be sure this is intended.

mongodb

/* Wrong: deletes only one document */
db.users.deleteOne({})

/* Right: deletes all documents */
db.users.deleteMany({})

Quick Reference

Command	Description
db.collection.deleteMany({})	Deletes all documents in the collection
db.collection.deleteOne({})	Deletes a single document matching the filter
db.collection.drop()	Deletes the entire collection including documents and indexes

Key Takeaways

Use db.collection.deleteMany({}) to delete all documents but keep the collection.

Avoid deleteOne({}) if you want to remove all documents; it deletes only one.

Do not confuse deleting documents with dropping the collection using drop().

Always confirm your filter is empty ({}) to delete everything safely.

Deleting documents is irreversible; back up data if needed before running.