Why Doesn\'t Axios POST Populate $_POST in PHP with JSON Data?

Axios POST Parameters Not Populating $_POST

When using Axios to perform a POST request with a payload consisting of JSON data, PHP may not interpret the parameters correctly from $_POST or $_REQUEST. Instead, the request data is often accessible through file_get_contents("php://input").

Root Cause:

By default, Axios serializes JavaScript objects to JSON. PHP, however, does not support JSON as a native data format for $_POST population. It only accepts the machine-processable formats supported by HTML forms:

• application/x-www-form-urlencoded
• multipart/form-data

Solution:

To resolve this issue, you can modify the Axios request to send data in the application/x-www-form-urlencoded format, which PHP can correctly handle. There are two primary options:

1. Using URLSearchParams API (Browser-Only):

var params = new URLSearchParams();
params.append('param1', 'value1');
params.append('param2', 'value2');
axios.post('/foo', params);

2. Using qs Library (Node.js):

var qs = require('qs');
axios.post('/foo', qs.stringify({ 'bar': 123 }));

These methods ensure that the request data is properly serialized to application/x-www-form-urlencoded format, making it accessible through $_POST in PHP.

Alternatively, you could modify PHP to handle JSON as a valid data format for $_POST, but this approach is less recommended.

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