I want to number each row when the data is saved in Google sheets

[blocks_channel (blocks)]

I want to number each row when the data is saved in Google sheets??
ID is number of the user
ex: user 1: ID = 1 , user 2 : ID= 2 …

this is my project:

blocks:

Google Sheets:

[TimAi2 (metricrat)]

If you want sequentially numbering, then do as follows:

1. Delete all blank rows in your sheet
2. Add this formula to B1:

={"ID";arrayFormula(if(A2:A="","",row(A2:A)))}

Send an empty string for your ID value in your app.
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If you want to pull a value from your app somewhere, include this in your empty block.

[Still-learning (1-2-3-4...)]

In Multiple ways you can achieve this.

1. One is generating Auro serial number in ghseet just like @TimAi2 advice
2. Get gsheet datas, count it and then add +1 then use this number in the &I_D= place…
3. whenever data added count the col and save it in any cell and at the time of sending data from app just call this cell value alone and just do +1 then use this number in &I_D Place (=ArrayFormula(COUNTA(A2:A))

[blocks_channel (blocks)]

Thank you for your help.
When I do this, the app does not send data at all.

[blocks_channel (blocks)]

Thank you for your help.

[TimAi2 (metricrat)]

@blocks_channel

When I do this, the app does not send data at all.

Did you delete all your empty rows as instructed? Scroll to the end of the sheet, I guess you will find data…

[blocks_channel (blocks)]

Thank you very much
I found the solution
function is : =ROW()-1