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Class PutItemCommand

Creates a new item, or replaces an old item with a new item. If an item that has the same primary key as the new item already exists in the specified table, the new item completely replaces the existing item. You can perform a conditional put operation (add a new item if one with the specified primary key doesn't exist), or replace an existing item if it has certain attribute values. You can return the item's attribute values in the same operation, using the ReturnValues parameter.

When you add an item, the primary key attributes are the only required attributes.

Empty String and Binary attribute values are allowed. Attribute values of type String and Binary must have a length greater than zero if the attribute is used as a key attribute for a table or index. Set type attributes cannot be empty.

Invalid Requests with empty values will be rejected with a ValidationException exception.

To prevent a new item from replacing an existing item, use a conditional expression that contains the attribute_not_exists function with the name of the attribute being used as the partition key for the table. Since every record must contain that attribute, the attribute_not_exists function will only succeed if no matching item exists.

For more information about PutItem, see Working with Items in the Amazon DynamoDB Developer Guide.


Use a bare-bones client and the command you need to make an API call.

import { DynamoDBClient, PutItemCommand } from "@aws-sdk/client-dynamodb"; // ES Modules import
// const { DynamoDBClient, PutItemCommand } = require("@aws-sdk/client-dynamodb"); // CommonJS import
const client = new DynamoDBClient(config);
const command = new PutItemCommand(input);
const response = await client.send(command);

PutItemCommandInput for command's input shape.


PutItemCommandOutput for command's response shape.


config for DynamoDBClient's config shape.







Readonly input

input: PutItemCommandInput

Readonly middlewareStack

middlewareStack: IMiddlewareStack<PutItemCommandInput, PutItemCommandOutput>


Static getEndpointParameterInstructions