Error: dynamodb: one or more parameter values were invalid: type mismatch for index key

Answered by Rafal Wilinski
What's Causing This Error
You may run into this error when you try to update and insert a new item to a DynamoDB table by using invalid data types for the attributes.
If you've pre-defined attributes (AttributeDefinitions
) to be used as the partition and range keys for your GSIs and table, you most likely selected a data type varying from a String, Number, or a Binary (Map).
Hence, the AttributeDefinitions
need to be preserved when creating or updating data.
Solution - Here's How To Resolve It
Verify that the attributes in your item are a part of the AttributeDenitions
which use the same data type specified during the creation time.
Other Common DynamoDB Errors (with Solutions)
- AWS DynamoDB errors ResourceNotFoundException
- dynamodb throughput error
- DynamoDB BatchWriteItem error
- Error retrieving DynamoDB table item validation exception
- DynamoDB delete fails
- DynamoDB validation error
- Could not connect to the endpoint URL https:dynamodb.singapore.amazonaws.com
- DynamoDB is already installed on a path
- DynamoDB transaction error
- dynamodb index does not exist
- dynamodb item size limit error
- DynamoDB stream not working
- dynamodb localhost not working
- AWS Lambda DynamoDB Stream Error
- dynamodb cannot convert undefined to object
Spend less time in the AWS console, use Dynobase.
Try 7-day free trial. No credit card needed.
Product Features
DynamoDB Tools
DynamoDB Info
© 2025 Dynobase