Guide on sending a JSON response from a POST request in JavaScript

Question

Guide on sending a JSON response from a POST request in JavaScript

After creating an API in Django that provides a JSON response based on a variable entered in the URL, I encountered a challenge with fetching and displaying this data using JavaScript.

For instance, consider this URL:

A sample of the JSON response looks like:

{"id": 1, "string": "iamnewtojavascript"}

Implementing a similar functionality in JavaScript has proven to be challenging for me despite searching extensively online for solutions.

In comparison, achieving this in Python is straightforward as shown below:

import requests
import json

url = "http://127.0.0.1:8000/api/string/IAMNEWTOJAVASCRIPT"

req = requests.post(url)
p = req.json()
data = json.dumps(p)
print(data)

javascript json api

Answer 1

Answer №1

To send a request in JavaScript, you can utilize the 'XMLHttpRequest' method. For more information, check out this resource.

Here's an example:

var dataToSend = {
    id: "1",
    string: "learningjavascript"
};

var httpRequest = new XMLHttpRequest();

// Callback function for readyState
httpRequest.onreadystatechange = function( ){
    if( this.readyState == 4 && this.status == 200 )    
        alert( this.responseText ) 
}

// Open connection to server
httpRequest.open("POST", /* URL GOES HERE */, true );
// Send the data
httpRequest.send( JSON.stringify( dataToSend ) );

This illustrates how to make a POST Request to the server. HTTP-Post-Requests are typically used for creating data on the server.

If you're looking to perform a HTTP-Get-Request instead, simply modify httpRequest.open("POST", ... ) to

httpRequest.open("GET", 'url', true );

and call httpRequest.send() without any parameter.

If you'd like further clarification on the distinctions between HTTP-Post-Requests and HTTP-Get-Requests, refer to this article.

Answer 2

To send a request in JavaScript, you can utilize the 'XMLHttpRequest' method. For more information, check out this resource.

Here's an example:

var dataToSend = {
    id: "1",
    string: "learningjavascript"
};

var httpRequest = new XMLHttpRequest();

// Callback function for readyState
httpRequest.onreadystatechange = function( ){
    if( this.readyState == 4 && this.status == 200 )    
        alert( this.responseText ) 
}

// Open connection to server
httpRequest.open("POST", /* URL GOES HERE */, true );
// Send the data
httpRequest.send( JSON.stringify( dataToSend ) );

This illustrates how to make a POST Request to the server. HTTP-Post-Requests are typically used for creating data on the server.

If you're looking to perform a HTTP-Get-Request instead, simply modify httpRequest.open("POST", ... ) to

httpRequest.open("GET", 'url', true );

and call httpRequest.send() without any parameter.

If you'd like further clarification on the distinctions between HTTP-Post-Requests and HTTP-Get-Requests, refer to this article.

Guide on sending a JSON response from a POST request in JavaScript

Answer №1

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