Error: DynamoDB Duplicate Key Error
Answered by Rafal Wilinski
What's Causing This Error
As the name suggests, the duplicate key error in DynamoDB arises when you try to insert an item on an existing primary key in the same table. In this case, the new item will overwrite the existing item with the new values. So, you can configure it in such a way that prevents the data from being overwritten.
Solution: Here's How To Resolve It
Using a conditional put operation is the easiest method to protect your data from being overwritten. By doing so, you can ensure a new entry is added only if the primary key does not exist. Here, set the Exists to false for the primary key attributes. That prevents the data from being overwritten if the key already exists. It is essential to check whether the primary key value is unique before inserting an item.
Other Common DynamoDB Errors (with Solutions)
- DynamoDB FilterExpression Not Working
- dynamodb the parameter cannot be converted to a numeric value
- DynamoDB throttling error
- dynamodb update fail if not exists
- a socket operation was attempted to an unreachable network dynamodb
- AWS Lambda DynamoDB Stream Error
- dynamodb table not exists
- error updating dynamodb table time to live
- DynamoDB Local Cannot Create Preexisting Table
- ExpressionAttributeValues contains invalid value: One or more parameter values were invalid: An AttributeValue may not contain an empty string
- Error ValidationException: One or more parameter values were invalid: Type mismatch for key X expected: S actual: M
- dynamodb docker unable to open database file
- dynamodb unable to locate credentials
- dynamodb streams missing events
- DynamoDB ConditionalCheckFailedException
Tired of AWS Console? Try Dynobase.
Try 7-day free trial. No credit card needed.
Product Features
DynamoDB Tools
DynamoDB Info
© 2026 Dynobase