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)
- DynamoDB FilterExpression not working
- DynamoDB string set cannot be empty
- dynamodb no range key value present
- DynamoDB stream no records processed
- Dynamodb error 500
- can't pickle thread.lock objects typeerror boto3 python dynamodb
- DynamoDB could not invoke null on class
- dynamodb query is null
- dynamodb cannot read property 'push' of undefined
- dynamodb cannot create preexisting table
- a socket operation was attempted to an unreachable network dynamodb
- DynamoDB type is not supported
- DynamoDB Delete Not Working
- failed to list tables not authorized dynamodb
- DynamoDB Item Does Not Exist
Dynobase is a Professional GUI Client for DynamoDB
Start your 7-day free trial today
Product Features
- New in Dynobase 3.0
- Semantic and Vector Search
- Schema Explorer
- Visual JSON Path Filtering
- Visual Item Diff
- MCP Server for AI Tools
- Use SQL with DynamoDB
- Import CSV To DynamoDB
- Import JSON To DynamoDB
- Export DynamoDB To JSON
- Export DynamoDB To S3
- Export DynamoDB To CSV
- DynamoDB Update Item
- DynamoDB Delete All Items
- DynamoDB Delete Item
- DynamoDB Create Table
- DynamoDB Delete Table
- DynamoDB Conditional Update
DynamoDB Tools
DynamoDB Info
© 2026 Dynobase