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use <whichever database>
db.getCollectionNames().forEach(function(c) { if (c.indexOf("system.") == -1) db[c].drop(); })
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// Example: Delete a Collection
// Remove an entire collection (table in SQL terms).
db.users.drop((err, result) => {
// Handle error or use result
});
// Example: Delete a Database
// Remove an entire database, including all its collections.
db.dropDatabase((err, result) => {
// Handle error or use result
});