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Showing content from https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html below:

AWS.DynamoDB — AWS SDK for JavaScript

Examples:

Calling the transactWriteItems operation

var params = {
  TransactItems: [ /* required */
    {
      ConditionCheck: {
        ConditionExpression: 'STRING_VALUE', /* required */
        Key: { /* required */
          '<AttributeName>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<AttributeName>': ... */
        },
        TableName: 'STRING_VALUE', /* required */
        ExpressionAttributeNames: {
          '<ExpressionAttributeNameVariable>': 'STRING_VALUE',
          /* '<ExpressionAttributeNameVariable>': ... */
        },
        ExpressionAttributeValues: {
          '<ExpressionAttributeValueVariable>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<ExpressionAttributeValueVariable>': ... */
        },
        ReturnValuesOnConditionCheckFailure: ALL_OLD | NONE
      },
      Delete: {
        Key: { /* required */
          '<AttributeName>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<AttributeName>': ... */
        },
        TableName: 'STRING_VALUE', /* required */
        ConditionExpression: 'STRING_VALUE',
        ExpressionAttributeNames: {
          '<ExpressionAttributeNameVariable>': 'STRING_VALUE',
          /* '<ExpressionAttributeNameVariable>': ... */
        },
        ExpressionAttributeValues: {
          '<ExpressionAttributeValueVariable>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<ExpressionAttributeValueVariable>': ... */
        },
        ReturnValuesOnConditionCheckFailure: ALL_OLD | NONE
      },
      Put: {
        Item: { /* required */
          '<AttributeName>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<AttributeName>': ... */
        },
        TableName: 'STRING_VALUE', /* required */
        ConditionExpression: 'STRING_VALUE',
        ExpressionAttributeNames: {
          '<ExpressionAttributeNameVariable>': 'STRING_VALUE',
          /* '<ExpressionAttributeNameVariable>': ... */
        },
        ExpressionAttributeValues: {
          '<ExpressionAttributeValueVariable>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<ExpressionAttributeValueVariable>': ... */
        },
        ReturnValuesOnConditionCheckFailure: ALL_OLD | NONE
      },
      Update: {
        Key: { /* required */
          '<AttributeName>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<AttributeName>': ... */
        },
        TableName: 'STRING_VALUE', /* required */
        UpdateExpression: 'STRING_VALUE', /* required */
        ConditionExpression: 'STRING_VALUE',
        ExpressionAttributeNames: {
          '<ExpressionAttributeNameVariable>': 'STRING_VALUE',
          /* '<ExpressionAttributeNameVariable>': ... */
        },
        ExpressionAttributeValues: {
          '<ExpressionAttributeValueVariable>': { /* AttributeValue */
            B: Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
            BOOL: true || false,
            BS: [
              Buffer.from('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */,
              /* more items */
            ],
            L: [
              /* recursive AttributeValue */,
              /* more items */
            ],
            M: {
              '<AttributeName>': /* recursive AttributeValue */,
              /* '<AttributeName>': ... */
            },
            N: 'STRING_VALUE',
            NS: [
              'STRING_VALUE',
              /* more items */
            ],
            NULL: true || false,
            S: 'STRING_VALUE',
            SS: [
              'STRING_VALUE',
              /* more items */
            ]
          },
          /* '<ExpressionAttributeValueVariable>': ... */
        },
        ReturnValuesOnConditionCheckFailure: ALL_OLD | NONE
      }
    },
    /* more items */
  ],
  ClientRequestToken: 'STRING_VALUE',
  ReturnConsumedCapacity: INDEXES | TOTAL | NONE,
  ReturnItemCollectionMetrics: SIZE | NONE
};
dynamodb.transactWriteItems(params, function(err, data) {
  if (err) console.log(err, err.stack); // an error occurred
  else     console.log(data);           // successful response
});

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