What could be causing the JSON String decode error to occur while utilizing extjs ajax?

Here is an example of my code:

Ext.Ajax.request({
            url:'test.jsp',
            params:{id:id,password:password},
            success:function(response){
                 console.log(response);
                 var results = Ext.util.JSON.decode(response.responseText);                     
                if(results.success){
                    document.location.href="../home.jsp";
                }
            }
        })  

After running this code, I encountered the following error:

Uncaught Error: You're trying to decode an invalid JSON String:

The console.log output showed:

Object {request: Object, requestId: 1, status: 200, statusText: "OK", responseText: "↵↵↵↵↵"…}

To resolve this issue, I modified the code as follows (using URL to pass parameters):

Ext.Ajax.request({
            url:'test.jsp?id=' + id + '&password=' + password,
            success:function(response){
                 console.log(response);
                 var results = Ext.util.JSON.decode(response.responseText);                     
                if(results.success){
                    document.location.href="../home.jsp";
                }
            }
        })  

Upon checking the console.log result after this change, it displayed:

Object {request: Object, requestId: 1, status: 200, statusText: "OK", responseText: "{success:true,msg:'success',url:'../main.jsp'}↵↵↵↵↵"…}

Following this adjustment, everything worked successfully.

Curious about why this alteration was necessary?

Answer №1

If you want to enable save mode, you can pass true as the second parameter.

// Here's an example of how your code should look:
Ext.util.JSON.decode(response.responseText, true);

Although this won't fix your issue entirely, it will eliminate errors.
Make sure to validate your JSON data to ensure accuracy.

Answer №2

A JSON object must contain some value within its curly braces, otherwise it is considered invalid. Attempting to parse an empty string using JSON.parse('') will result in an exception being thrown.

However, if you try to parse an empty JSON object like JSON.parse('{}'), there won't be any issues.

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