topic Re: How to open this JSON file as a data table? in Discussions

How to open this JSON file as a data table?

shasheminassab1 — Sat, 10 Jun 2023 23:40:29 GMT

I need help with opening this JSON file in JMP as a data table: https://www.purpleair.com/data.json

I used JMP's JSON Import Wizard, but have not been able to open the file in a way that I want to.

I'd like the 'fields' to be the column headers and 'data' to be the rows in the data table. I appreciate your help in advance.

Re: How to open this JSON file as a data table?

jthi — Sat, 13 Nov 2021 21:03:06 GMT

Most likely there are better ways to handle this, but here is one possible solution (requires JMP16 due to For Each):

Names Default To Here(1);
s = New HTTP Request(
	url("https://www.purpleair.com/data.json"),
	Method("GET"),
	Headers({"Accept: application/json"})
) << Send;
aa_json = Associative Array(Parse JSON(s));
//aa_json << get keys;
//aa_json["fields"];

//Create collection table and columns
dt = New Table("json");
For Each({new_col}, aa_json["fields"],
	dt << New Column(new_col);
);
Column(dt, "Label") << Data Type("Character"); //character columns must be set "manually"

//Fill rows
row_count = N Items(aa_json["data"]);
dt << Add Rows(row_count);
dt[0,0] = aa_json["data"];
Write(); //empty Write() to avoid printing all values to log

Re: How to open this JSON file as a data table?

Craige_Hales — Sun, 14 Nov 2021 03:26:38 GMT

nice!

Re: How to open this JSON file as a data table?

shasheminassab1 — Sun, 14 Nov 2021 08:55:59 GMT

Thanks a lot @jthi !