DynamoDB Code Examples — Copy-Paste Snippets

Read a single DynamoDB item by its primary key in Node.js with AWS SDK v3 — a complete, runnable GetItemCommand example with the client, key marshalling, and the response shape.

Read a single DynamoDB item by its primary key in Python with boto3 — a complete, runnable get_item example using the resource API, Decimal numbers, and the response shape.

Read a single DynamoDB item by its primary key from the AWS CLI — a complete, runnable get-item command with the DynamoDB JSON key format, projection, and consistent-read flag.

Write a DynamoDB item in Node.js with AWS SDK v3 — a complete, runnable PutItemCommand example with the item's attributes and a ConditionExpression to prevent overwrites.

Write a DynamoDB item in Python with boto3 — a complete, runnable put_item example using native types, Decimal for numbers, and a ConditionExpression to prevent overwrites.

Write a DynamoDB item from the AWS CLI — a complete, runnable put-item command with the DynamoDB JSON item format and a condition-expression to prevent overwrites.

Update a DynamoDB item in Node.js with AWS SDK v3 — a complete, runnable UpdateItemCommand example with SET, an atomic counter, ReturnValues, and reserved-word aliases.

Update a DynamoDB item in Python with boto3 — a complete, runnable update_item example with SET, an atomic ADD counter, ReturnValues, Decimal, and reserved-word aliases.

Update a DynamoDB item from the AWS CLI — a complete, runnable update-item command with SET, an atomic ADD counter, return-values, and reserved-word aliases.

Query a DynamoDB partition in Node.js with AWS SDK v3 — a complete, runnable QueryCommand example with KeyConditionExpression, sort-key condition, and LastEvaluatedKey pagination.

Query a DynamoDB partition in Python with boto3 — a complete, runnable query example using the Key condition helper, sort-key filter, and LastEvaluatedKey pagination.

Query a DynamoDB partition from the AWS CLI — a complete, runnable query command with key-condition-expression, expression-attribute-values, and how CLI auto-pagination works.

Scan a DynamoDB table in Node.js with AWS SDK v3 — a complete, runnable ScanCommand example with FilterExpression, LastEvaluatedKey pagination, and why Scan is a last resort.

Scan a DynamoDB table in Python with boto3 — a complete, runnable scan example using the Attr filter helper, LastEvaluatedKey pagination, and why Scan is a last resort.

Scan a DynamoDB table from the AWS CLI — a complete, runnable scan command with filter-expression, CLI auto-pagination, parallel-scan segments, and why Scan is a last resort.