Put item on DynamoDB table using AWS SDK for Node.js

Question

I'm new to javascript and node.js and was wondering if someone can help me figure out the syntax of putting a new item onto an existing table on AWS Dynamodb through their node.js SDK. Here's what I have so far. Is there an example for what I'm trying to do? If anyone could point me in the right direction, it'd be much appreciated.

var AWS = require('aws-sdk');
AWS.config.loadFromPath('./config.json');
AWS.config.update({region: 'us-east-1'});
var dynamodb = new AWS.DynamoDB();

var item = {
    // I need to put the an item with a the primary key of "id", and an attribute called "item"
    // I'm new to js and node.js, so if somebody could help me understand the documentation
    // http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/frames.html#!http%3A//docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB_20120810.html
}

dynamodb.putItem({TableName: 'log_dev', Item: item}, function(err, data){
    if (err) {
    console.log(err); // an error occurred
    } else {
    console.log(data); // successful response
    }
});

blo0p3r · Accepted Answer · 2016-01-28 18:34:59Z

36

dynamoDB.putItem(
{
    "TableName": "Table1",
    "Item": {
        "Color": {"S": "white"},
        "Name": {"S": "fancy vase"},
        "Weight": {"N": "2"},
        "LastName":{"S": "Kumar"}
    }
}, function(result) {
    result.on('data', function(chunk) {
        console.log("" + chunk);
    });
});
console.log("Items are succesfully ingested in table ..................");

edited Jan 28, 2016 at 18:34

blo0p3r

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answered Oct 17, 2013 at 12:20

Anki007

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1 Comment

Taku Over a year ago

dynamoDb-marshaler will help ease the pain of formatting

muhqu · Accepted Answer · 2013-07-22 06:00:12Z

5

I expect your "id" to be numeric...

var item = {
    "id": {"N": 1234},
    "title": {"S": "Foobar"}
}

Note that with DynamoDB you specify the data type (N » numeric, S » string, B » binary) at table creation, only for the primary key (HashKey or HashKey+RangeKey). All other columns are allowed to vary in their data type, and can be seen as key-value pairs. So it is essential for DynamoDB to always encode the data type with the item attributes.

answered Jul 22, 2013 at 6:00

muhqu

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Comments

Ryan Zhou · Accepted Answer · 2015-11-02 05:19:13Z

3

I don't think muhqu's answer works, I believe the value of the attribute has to be a string.

var item = {
"id": {"N": "1234"},
"title": {"S": "Foobar"} }

http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#putItem-property

edited Nov 2, 2015 at 5:19

answered Oct 27, 2015 at 4:40

Ryan Zhou

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Comments

Christopher Moore · Accepted Answer · 2020-07-19 03:13:51Z

I would suggest using documentClient as it makes it easier to read and write data in dynamoDb. Also using conditional putItem will make sure the item is unique and doesn't overwrite existing item. "attribute_not_exists" checks if the userId in the example doesn't exist. If userId exists, it throws an error. Hope it's not too late :P

var AWS = require('aws-sdk');
AWS.config.loadFromPath('./config.json');
AWS.config.update({region: 'us-east-1'});
var dynamodb = new AWS.DynamoDB.DocumentClient();

var item = {
"userId" : {"N":"12345678"},
"name":{"S":"Bob"}
}

var dbParam= {
TableName: tableName,
Item:item,
ConditionExpression: 'attribute_not_exists(#u) or #u = :userId',
ExpressionAttributeNames: { "#u" : "userId"}
}

dynamodb.putItem(dbParam, function(err,data) {
if(err){
console.log("err",err);
}
else{
console.log("data",data)
}
});

Nate-Wilkins · Accepted Answer · 2022-10-31 22:48:38Z

1

Using the aws-sdk you would use something like the following:

import { DynamoDB } from 'aws-sdk';

const dynamo = new DynamoDB.DocumentClient();

const main = async () => {
    const results = await dynamo
        .put({
            TableName: 'people',
            Item: {
              dateCreated: { S: new Date().toUTCString() },
              name: { S: name },
            },
        })
        .promise();

    console.log(JSON.stringify(results));
};

main();

answered Oct 31, 2022 at 22:48

Nate-Wilkins

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