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How to build a dynamic JSON object

uday_guntupalli

All,
I am wondering how to build a dynamic JSON object in JSL ?

request = New HTTP Request(
	url( "http://httpbin.org/post" ),
	Method( "POST" ),
	JSON( "\[{"username":"bob","address":"12345"}]\" )
);

Using the example from the scripting index, if I wantedt to vary the username from bob to say mark and address from 12345 to 12346 and I have 10 such calls, I would prefer building that as a dynamic object outside. I initially ventured down the path of building it as an Associative Array and then using the As JSON Expr() , however, that is resulting in an error. My approach in that case was:

MyAA = Associative Array(); 
MyAA["username"] = "bob" ; 
MyAA["address"] = "12345" ;<BR /><BR />request = New HTTP Request(
	url( "http://httpbin.org/post" ),
	Method( "POST" ),
	JSON( As Json Expr(MyAA)) 
);

Of course, this is not happening for this example, but the api I am trying to call on. However, when I pass hardcoded JSON as an input, the api call works as expected.

Any help is appreciated.

Accepted answers

nascif_jmp

The JavaScript/Python syntax for lists ("[]") does not mean the same thing in JSL. In JSL '[]' denotes an empty matrix, which does not a have valid JSON representation, which is why you are getting the '?' operator in the result. That '?' operator in turn must be what is causing the remote error message you are getting as a response from your service.

You should use instead '{}' to indicate an empty list, or '[=>]' to indicate an empty associative array/dictionary.

It is always a good practice to capture intermediate results and examine them using show() to test your assumptions.

http://wiki.c2.com/?MakeItWorkMakeItRightMakeItFast

All comments

vince_faller

Have you confirmed that your AS JSON Expr() is the same as your hardcoded?

Building the JSON object seems to be working.

Names default to here(1);
MyAA = Associative Array(); 
MyAA["username"] = "bob" ; 
MyAA["address"] = "12345" ;
myAA["aa"] = associative array();
myAA["aa"]["thing1"] = 14;
myAA["aa"]["thing2"] = 28;

show( As JSON Expr(myAA));

uday_guntupalli

@vince_faller ,
As some of the parameters are not something I can share here, I sent it to you as a private message. You will see from the message that the hard-coded example and the As JSON Expr() have the same parameters , the values are dynamic, but it results in an error as I have shown earlier.

uday_guntupalli

@vince_faller,

So the issue is stemming from this:

If the associative array has a key with no value, then upon using the As JSON Expr(), it gets translated to this wierd operator(?) which is not something that can be parsed properly which in turn throws an error. In my case, I just dropped the key from my Associative Array and it worked, however I am curious to know what is the right way to pass such a parameter ?

vince_faller

Can I firstly recommend that you don't just copy a picture, but use the JSL code functionality so people can copy and paste your code?

I assume you're trying to give a vector to username?
I'm still not having it crash with httpbin, though it is still doing the weird operator thing. If I used a list instead of a matrix though it seems to do what I think you want.

Names default to here(1);
MyAA = Associative Array();
MyAA["username"] = {1, 2, 3};
MyAA["address"] = "12345";
request = New HTTP Request(
	url( "http://httpbin.org/post" ),
	Method( "POST" ),
	JSON( AsJSONExpr(myAA) )
);
data = request << Send;

Does that help?

Mark_Bailey

You can define any result that you want returned when referring to a key that does not have a value in a pair in an associative array.