Get wrong number from debug node

[ThisIsFrankTsai]

Hi,there

Please helped me,

I designed a simple flow as below,

timestample -> function ->debug

My function dseigined as below,

msg.payload =0x01033120000C4AF9;
return msg;

I send 0x01033120000C4AF9 (hex)

But I got the wrong number 0x01033120000C4B00 (hex) in debug node.

The code and picture as attactment

TestFlow.json (1.6 KB)

[Colin]

Is that larger than the maximum integer that can be held accurately in JavaScript? Google for
JavaScript maximum integer
To check.

[ThisIsFrankTsai]

Thank you for your reply

But my teacher can show the correct number as the same flow.

[dceejay]

Indeed as @Colin suggests

[Steve-Mcl]

@ThisIsFrankTsai

But my teacher can show the correct number as the same flow.

Did he use BigInt?

NOTE: To clarify for future readers.

The problem is not with Node-RED or the debug panel, it is due to the design on the Number type.

See: Number.isSafeInteger() - JavaScript | MDN

[ThisIsFrankTsai]

How should i fix this problem?

i would send the larger number

[Colin]

@ThisIsFrankTsai

How should i fix this problem?

That depends on what do you want to do with that number.

[Steve-Mcl]

@ThisIsFrankTsai

How should i fix this problem?

As I went to extreme lengths to demonstrate...

@Steve-Mcl

use BigInt?

Use BigInt

---

Of course, it matters where you are sending this?

[ThisIsFrankTsai]

I have a device that receive hex number ,when the device receive right instruction,
it will send the state to me.
I designed the flow as the photo.

If you have any idea ,please tell me.

[ThisIsFrankTsai]

Thank you Steve-Mcl

I have used BigInt function in function node,but i also get wrong number.

as photo

[Steve-Mcl]

You have put brackets around the number and then called toString causing the number to be evaluated before the call to bigint

Take another look at my screenshot