JSON vs. JSONP: What are the Key Differences in Format, File Type, and Usage?

JSON vs JSONP: Differences in Format, File Type, and Usage

While both JSON (JavaScript Object Notation) and JSONP (JSON with Padding) use the same JSON syntax for data representation, there are key differences in their format, file type, and practical use.

Format:

In JSON, data is enclosed in curly braces ({}) and represented using key-value pairs. JSONP, on the other hand, wraps the JSON data in a function call. The function name is specified at the beginning of the string, followed by the JSON data enclosed in parentheses.

Example:

// JSON
{"name":"stackoverflow","id":5}

// JSONP
func({"name":"stackoverflow","id":5});

File Type:

JSON data is typically stored as a plain text file with the ".json" file extension. JSONP, being embedded in a script file, is typically served as a JavaScript file with the ".js" extension.

Practical Use:

JSON is widely used for data exchange over HTTP and is often used in web APIs. It allows data to be transferred between different systems or applications in a structured and human-readable format.

JSONP, on the other hand, is primarily used for cross-site AJAX (Asynchronous JavaScript and XML). In cases where cross-origin requests are restricted, JSONP allows data to be retrieved from a different domain by wrapping it in a function call. This technique is referred to as "JSON with Padding" as the function call serves as a wrapper around the JSON data.

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