53 lines
1.3 KiB
Markdown
53 lines
1.3 KiB
Markdown
---
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title: Working With JSON APIs
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---
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## Working With JSON APIs
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A common use of JSON is to read data from a web server, and display the data in a web page.
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This chapter will teach you how to exchange JSON data between the client and a PHP server.
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### The PHP File
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PHP has some built-in functions to handle JSON.
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Objects in PHP can be converted into JSON by using the PHP function `json_encode()`:
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```php
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<?php
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$myObj->name = "John";
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$myObj->age = 30;
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$myObj->city = "New York";
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$myJSON = json_encode($myObj);
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echo $myJSON;
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?>
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```
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[Try it](https://www.w3schools.com/js/showphp.asp?filename=demo_file)
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### The Client JavaScript
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Here is a JavaScript on the client, using an AJAX call to request the PHP file from the example above:
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#### Example
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Use JSON.parse() to convert the result into a JavaScript object:
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```js
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var xmlhttp = new XMLHttpRequest();
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xmlhttp.onreadystatechange = function() {
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if (this.readyState == 4 && this.status == 200) {
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var myObj = JSON.parse(this.responseText);
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document.getElementById("demo").innerHTML = myObj.name;
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}
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};
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xmlhttp.open("GET", "demo_file.php", true);
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xmlhttp.send();
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```
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[Try it](https://www.w3schools.com/js/tryit.asp?filename=tryjson_php_simple)
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### More Information:
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- For more [check this link](https://www.w3schools.com/js/js_json_php.asp)
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