How to measure data size

[elonrocket]

How do I measure how much space a specific value in a datastore is taking up?

[Creeperman16487]

i guess there is plugin for datastore not sure if that can help

[elonrocket]

The question is how, if there is a plugin that does it I want to know how it works.

[SOTR654]

Create or get a module with the information and export it, DataStore Editor can do it for you.
Next, open the file settings and see how much it weighs:

Module: return 10
File:

Here’s something bigger:

Module

return {
    "Sword",
    "Apple",
    "Cookie",
    "Taco"
}

File:

[elonrocket]

That works, but I don’t want to have to download a .lua file everytime. Is there any easy way I can just make a function and insert a value and it will output the data size, potentially with HttpService?

[SOTR654]

With this function:

local Data = game:GetService("DataStoreService"):GetDataStore("Inventory")
local suc,dat = pcall(function()
    return Data:GetAsnyc("Sword")
end)
print(game:GetService("HttpService"):JSONEncode(dat):len())

Original post:

Is there a possible way to check the size of a data?

If you are storing data in tables, you can use HttpService:JSONEncode() local dataStore = game:GetService("DataStoreService") local exampleData = dataStore:GetDataStore("exampleData") local HTTP = game:GetService("HttpService") local suc,dat = pcall(function() return exampleData:GetAsnyc("Key_Name") end) print(string.len(HTTP:JSONEncode(dat))) I didn’t tested it, so I can’t totally say this is works.

It does not give exact, but it works.

[funwolf7]

The above post gives some code that works but I will go into more detail here.

Datastores encode the what you put in into JSON. So, to get the size of a value in a datastore, just encode it into JSON using HttpService:JSONEncode then get the length of the string.

[elonrocket]

How accurate is that though? because in the post provided

@Operatik

According to a Stack Overflow topic :

• An ASCII character in 8-bit ASCII encoding is 8 bits (1 byte), though it can fit in 7 bits.

• An ISO-8895-1 character in ISO-8859-1 encoding is 8 bits (1 byte).
• A Unicode character in UTF-8 encoding is between 8 bits (1 byte) and 32 bits (4 bytes).
• A Unicode character in UTF-16 encoding is between 16 (2 bytes) and 32 bits (4 bytes), though most of the common characters take 16 bits. This is the encoding used by Windows internally.
• A Unicode character in UTF-32 encoding is always 32 bits (4 bytes).
• An ASCII character in UTF-8 is 8 bits (1 byte), and in UTF-16 - 16 bits.
• The additional (non-ASCII) characters in ISO-8895-1 (0xA0-0xFF) would take 16 bits in UTF-8 and UTF-16.

not each character is exactly 1 byte

[funwolf7]

It is accurate as string.len returns the number of bytes, not the number of unicode characters. If you do string.len on a unicode character you will see it returns 2 or more.

[elonrocket]

Can you provide an example of string.len returning a different number than the characters? Because for me it’s returning the same.

[funwolf7]

Try doing string.len on an emoji or some other unique character. I’m on mobile so I can’t test right now but something like this should work:

print(string.len("😔"))

[elonrocket]

I see it returned 4, thank you for the help!

Also thank you @SOTR654 for the help!

[SOTR654]

Eh… You’re welcome! Happy to help xd
I still say that it is not exact because it is the size of the string, but not in bytes as it is saved by roblox

[elonrocket]

Yeah I noticed a little discrepancy between the file, it should be fine though for what I am trying to do.

[SaleMales]

string.len returns LENGTH of string, not how much data it is taking

It will be same as #“”

(Sorry for reviving, but it is kind of disinformation you give)