Error: Error ValidationException: One or more parameter values were invalid: Type mismatch for key X expected: S actual: M
Answered by Rafal Wilinski
Solution
When trying to put or update an item to DynamoDB, you might have tried to write it with incorrect attribute type for example number instead of string or the other way around.
Even though DynamoDB is schemaless, at the table creation you had an ability to specify some AttributeDefinitions. They need to be preserved for all the items in the table.
Other Common DynamoDB Errors (with Solutions)
- dynamodb: one or more parameter values were invalid: type mismatch for index key
- dynamodb attribute does not exist
- DynamoDB transaction error
- DynamoDB BatchSave not working
- dynamodb localhost not working
- dynamodb the table does not have the specified index
- DynamoDB GetItem no item
- dynamodb index does not exist
- dynamodb table not exists
- dynamodb number_value cannot be converted to string
- DynamoDB is already installed on a path
- dynamodb trigger no records processed
- DynamoDB delete fails
- DynamoDB batch write is not working
- DynamoDB query is slow
Spend less time in the AWS console, use Dynobase.
First 7 days are on us. No strings attached.
Product Features
DynamoDB Tools
DynamoDB Info
© 2025 Dynobase