Using the Perl module JSON to create a JSON object

Question

I'm having a killer time trying to create a JSON object to return to a jQuery request.

I'm trying to use the jQuery chained select module

and I'm trying to create the JSDN object using Perl's JSON module.

I have no idea what I'm doing wrong or how I can even debug it, about the best I can do is get a JS dialog box coming up with "A unknown error....".

This is all I was trying to do to create the JSON object, I thought this would be all that is needed, but it's not. Any ideas?

TIA

use JSON;
my %data = (1 => 'val1',
            2 => 'val2',
            3 => 'val3',
           );
my $json_text = to_json(\%data);
print $json_text;

So what of the answers suggested was the correct one? With this question there is much guessing involved. Maybe add more details. — U. Windl
– U. Windl, Commented Aug 30, 2021 at 6:31

Quentin · Accepted Answer · 2009-10-27 21:30:34Z

5

Running the script gives:

{"1":"val1","3":"val3","2":"val2"}

… which is the expected output.

The problem almost certainly lies with whatever code you are using to get the JSON from your server to the client.

answered Oct 27, 2009 at 21:30

Quentin

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3 Comments

Chris Over a year ago

I'm just printing it out - I thought that was all that was needed? "print $json_text"

Ether Over a year ago

@Chris: The code snippet you provided in the question above is correct, and works properly. Try it again yourself in a standalone script and see. (So it must be something else in your script that is wrong.)

Quentin Over a year ago

Where are you printing it to? What does the output look like?

woolstar · Accepted Answer · 2009-10-27 21:33:08Z

1

Have the javascript output the response text before processing to a textarea so you can see if there's something failing in transport. Also, you're going to want to put something in front of the data, like "myVar= " so that the data is assigned to something on the other end.

answered Oct 27, 2009 at 21:33

woolstar

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1 Comment

Chris Over a year ago

Thanks Woolstar, I'll try to figure out how to do that (I know nothing about JQuery)

dwp · Accepted Answer · 2009-10-28 03:34:15Z

1

Looks like you already figured it out your issue, and if you were wondering why it wasn't working is because the to_json method is not exported from JSON.pm in the older versions of the JSON module. The latest version on CPAN (2.0) exports to_json into your namespace but versions ~1.5 don't and require the JSON::. Many repos still carry this older version, and if you are running on CentOS ~5.3 or an older version of Fedora Core you will have the older JSON.pm.

answered Oct 28, 2009 at 3:34

dwp

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