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How to Properly Construct JSON Objects for AJAX Web Service POST Requests?

Linda Hamilton
Release: 2025-01-06 02:25:40
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How to Properly Construct JSON Objects for AJAX Web Service POST Requests?

Constructing a JSON Object for AJAX WebService Calls

When sending data to an AJAX WebService using a POST request, properly formatting the JSON object is crucial. This article addresses the common issue of manually formatting JSON data, which can lead to errors.

JavaScript JSON Object Construction

To build a valid JSON object in JavaScript, follow these steps:

  1. Create a Native JavaScript Data Object: Define your data using JavaScript data types, representing the structure of your object. For example:
var myData = {
    Address: {
        Address1: "123 Main Street",
        Address2: null,
        City: "New York",
        State: "NY",
        Zip: "10000",
        AddressClassification: null
    }
};
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  1. JSON-Encode the Data: Encode the JavaScript data object using the $.toJSON() method from the JSON plugin or JSON.stringify() from the JSON library:
$.ajax({
    ...
    data: { request: $.toJSON(myData) }
    ...
});
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Note: Enclose the encoded data in an additional object with the parameter name as the key, as shown in the example.

Web Service Endpoint Requirements

The data you send must conform to the requirements of the WebMethod in your ASP.NET web service. For example, if your WebMethod has the following parameters:

public Response ValidateAddress(Request request)
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The JSON object you send should have the property request containing your data:

{ request: ... }
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Case Sensitivity in JSON Requests

Case sensitivity depends on the ASP.NET web service's configuration. By default, JSON requests are case-sensitive, but you can modify the metadata endpoint bindings to make them case-insensitive. Consult the ASP.NET documentation for details.

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