Remove a field

javascript

db.users.updateMany({ legacy_flag: { $exists: true } }, { $unset: { legacy_flag: "" } })

Explanation

`$unset` removes the field from documents instead of setting it to null.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Field update operators

Increase a counter with `$inc`.

Open In sheetjavascriptsame section

Change a field name in-place.

Open In sheetjavascriptsame section

Set a field to the current date.

Open In sheetjavascriptsame section

Push one item onto an array field.

Open In sheetjavascript1 tag match

Use `$addToSet` to avoid duplicates.

Open In sheetjavascript1 tag match

Delete matching values from an array.

Open In sheetjavascript1 tag match