To make a POST request in JavaScript, you can use either the XMLHttpRequest object or the fetch API. I’ll provide examples for both methods:
Using XMLHttpRequest:
var xhr = new XMLHttpRequest();
xhr.open('POST', 'https://api.example.com/data', true);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onreadystatechange = function() {
if (xhr.readyState === 4 && xhr.status === 200) {
var response = JSON.parse(xhr.responseText);
console.log(response);
}
};
var data = {
name: 'John Doe',
age: 25
};
xhr.send(JSON.stringify(data));
In the above code, we create a new XMLHttpRequest object, set the request method to ‘POST’, specify the URL, set the ‘Content-Type’ header to ‘application/json’ (assuming we are sending JSON data), define an onreadystatechange callback to handle the response, serialize the data as JSON using JSON.stringify, and send the request using the send method.
Using the fetch API:
fetch('https://api.example.com/data', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
name: 'John Doe',
age: 25
})
})
.then(function(response) {
if (response.ok) {
return response.json();
}
throw new Error('Network response was not OK.');
})
.then(function(data) {
console.log(data);
})
.catch(function(error) {
console.log('Error:', error.message);
});
In the above code, we use the fetch function with the URL and an options object. In the options object, we specify the request method as ‘POST’, set the ‘Content-Type’ header to ‘application/json’, and provide the request body as a serialized JSON string using JSON.stringify.
Both methods allow you to customize the request headers and body based on your needs.
