JSONP Tutorial
JSONP History
JSONP (JSON with Padding or JSON-P) was originally proposed by Bob Ippolito in 2005.
What is JSONP?
JSONP is a runnable JavaScript with callback.
Why JSONP?
When you make requests through JavaScript (XMLHttpRequest) across domains, you will receive an error "Request blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.'
As <script>
tags are exempted from same-origin policies. Bob Ippolito uses this advantage to develop JSONP to share resources across foreign origins.
In the following example, we will send a request and receive a response within the same origin. But, you can also use this example for foreign origins.
Note: We provide server-side coding for both PHP and Node.js, you can choose your favorite.
Example
The following is the server-side coding using PHP.
Note: The response is wrapped inside a function call.
The following is the server-side coding using Node.js.
Note: The response is wrapped inside a function call.
The following is the client-side coding to request and receive a response.
Syntax
Reminder
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