dynamodb delete all items in table

var params = {
    TableName: 'table_name',
};

docClient.scan(params, function(err, data) {
    if (err) ppJson(err); // an error occurred
    else {
       data.Items.forEach(function(obj,i){
           console.log(i);
            console.log(obj);
            var params = {
                TableName: 'chatUserMapping',
                Key: { // a map of attribute name to AttributeValue for all primary key attributes
                
                    "sampleHashKey": obj.sampleHashKey,
                    "sampleRangeKey": obj.sampleRangeKey
                    // more attributes...
            
                },
                ReturnValues: 'NONE', // optional (NONE | ALL_OLD)
                ReturnConsumedCapacity: 'NONE', // optional (NONE | TOTAL | INDEXES)
                ReturnItemCollectionMetrics: 'NONE', // optional (NONE | SIZE)
            };
    
            docClient.delete(params, function(err, data) {
                if (err) ppJson(err); // an error occurred
                else ppJson(data); // successful response
            });
        
       });
    }
});

dynamodb delete all tables

dynamodb.listTables().eachPage(function(err, data) {
  
    if (err) {
        ppJson(err); // an error occurred
    } else if (data) {
        console.log(data);
          data["TableNames"].forEach(function(tablename, i) {
              console.log(tablename);
              var params = {
                TableName: tablename,
                };
                dynamodb.deleteTable(params, function(err, data) {
                    if (err) ppJson(err); // an error occurred
                    else ppJson(data); // successful response
                });
          })

    }
});