mongodb
MongoDB duplicate key violation
E11000 duplicate key error
Fixes
- 1.Check for existing documents before insert, or use upsert
- 2.Verify your unique index fields don't have null values creating conflicts
- 3.Use findOneAndUpdate with upsert:true for insert-or-update patterns
mongodbmongooseduplicate-key
Related Errors
mongodb3 fixes
Mongoose required field validation error
ValidationError.*Path.*is required|validation failed.*required
- •Ensure all required fields defined in schema are provided before save()
- •Check for typos in field names — Mongoose silently ignores unknown fields
mongodb3 fixes
Mongoose CastError invalid ObjectId
CastError.*Cast to ObjectId failed
- •Validate the ID format before querying: mongoose.Types.ObjectId.isValid(id)
- •Check route params aren't receiving unexpected values (e.g., 'favicon.ico')
mongodb3 fixes
Mongoose operation buffering timed out
buffering timed out|connection.*buffering.*timed
- •Ensure mongoose.connect() is called and resolves before running queries
- •Check MongoDB server is running and connection string is correct