Error: DynamoDB is missing the key id in the item

“Missing the key id in the item” means the target table requires an attribute named id, but the submitted item does not contain it in the expected form. The required name comes from that table’s schema; id is not a universal DynamoDB key name.

import boto3

table = boto3.resource("dynamodb", region_name="us-east-1").Table("Orders")
table.put_item(Item={"id": "ORDER#123", "status": "NEW"})

This example assumes a string partition key named id and no sort key. Check DescribeTable before adapting it. A composite-key table requires both key attributes. For UpdateItem, put the key in Key; for PutItem or a batch PutRequest, include it in Item.

Check case, undefined or omitted values, mapper annotations, and accidental nesting. Boto3 does not invent a missing primary key. UpdateTable cannot change an existing table’s primary key schema; changing key design requires creating a new table and migrating data.

See primary key design and AWS documentation.