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Showing content from https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_ConditionCheck.html below:

ConditionCheck - Amazon DynamoDB

Represents a request to perform a check that an item exists or to check the condition of specific attributes of the item.

In the following list, the required parameters are described first.

ConditionExpression

A condition that must be satisfied in order for a conditional update to succeed. For more information, see Condition expressions in the Amazon DynamoDB Developer Guide.

Type: String

Required: Yes

Key

The primary key of the item to be checked. Each element consists of an attribute name and a value for that attribute.

Type: String to AttributeValue object map

Key Length Constraints: Maximum length of 65535.

Required: Yes

TableName

Name of the table for the check item request. You can also provide the Amazon Resource Name (ARN) of the table in this parameter.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: Yes

ExpressionAttributeNames

One or more substitution tokens for attribute names in an expression. For more information, see Expression attribute names in the Amazon DynamoDB Developer Guide.

Type: String to string map

Value Length Constraints: Maximum length of 65535.

Required: No

ExpressionAttributeValues

One or more values that can be substituted in an expression. For more information, see Condition expressions in the Amazon DynamoDB Developer Guide.

Type: String to AttributeValue object map

Required: No

ReturnValuesOnConditionCheckFailure

Use ReturnValuesOnConditionCheckFailure to get the item attributes if the ConditionCheck condition fails. For ReturnValuesOnConditionCheckFailure, the valid values are: NONE and ALL_OLD.

Type: String

Valid Values: ALL_OLD | NONE

Required: No

For more information about using this API in one of the language-specific AWS SDKs, see the following:

Condition

ConsumedCapacity

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