Check ItemSize DynamoDB in Node.js

Question

I use the dynamo set function to store data in DynamoDB, but sometimes the data is too big. Is there a function that I can use to determine if the data is too big to be saved in DynamoDB? a Node js function? Thanks

This should work even if the data is an object with arrays and other objects.

I tried to npm module object-sizeof, does that work?

Do you mean whether the data exceeds 400 KB max size? – notionquest Mar 15 '17 at 16:59 — notionquest, Mar 15 '17 at 16:59
yes how do I check that the data doesn't exist 400Kb – Chris Hansen Mar 15 '17 at 17:14 — Chris Hansen, Mar 15 '17 at 17:14

score 0 · Answer 1 · edited May 23 '17 at 12:02

0

You can use dyno-item-size module to get the item size.

var dynoItemSize = require('dyno-item-size');
var size = dynoItemSize(item);

var params = {
    TableName : table,
    Item : {
        "autoID" : "yyy",
        "alexandriaID" : "id1",
        "docType" : "foo",
        "username" : "good",
        "userdescription" : "user description",
        "comment" : "complex condition"
    }
};

console.log("Size of item =====>" + dynoItemSize(params.Item));

References:-

ItemSize in DynamoDB http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/WorkingWithItems.html

An item size is the sum of lengths of its attribute names and values (binary and UTF-8 lengths);

edited May 23 '17 at 12:02

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answered Mar 15 '17 at 18:23

notionquest

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this doesn't work when your Item has arrays and objects. Is there another way? – Chris Hansen Mar 15 '17 at 18:53
How are you saying this doesnt work for array and object? Can you give an example? – notionquest Mar 15 '17 at 19:06
and Item that has an array for a key and an object for another key – Chris Hansen Mar 15 '17 at 19:16
Thanks! Better provide the sample item and expected result. Will check with the above apis and let you know. – notionquest Mar 15 '17 at 19:18

Check ItemSize DynamoDB in Node.js

1 Answers1