Oct 9, 2017 · Use FormData and fetch to grab and send data. fetch(form.action, {method:'post', body: new FormData(form)});

You're setting the Content-Type to be multipart/form-data, but then using JSON.stringify on the body data, which returns application/json. You have a content type mismatch. You will need to encode your data as multipart/form-data instead of json.

Sep 19, 2016 · To POST data from a form with many inputs, I would recommend looking into ways to serialize form data into a string. If using jQuery, this can be done using the $.serialize() method. If using plain JS, take a look at this thread: stackoverflow.com/questions/11661187/…

Apr 4, 2024 · To POST form data using the JavaScript fetch API: Add a submit event handler to the form element. Use the FormData() constructor to create a FormData object. Use the fetch() method to send the FormData object over the networking, setting the HTTP method to POST. Here is the HTML for the example. And here is the related JavaScript code.

Apr 11, 2025 · But instead of this declarative approach, web apps sometimes use JavaScript APIs such as fetch() to send data programmatically to an endpoint that expects a form submission. This article explains why this is an important use case and how to do it.

Jun 14, 2023 · To post form data using Javascript Fetch, simply set the send method to “post”, and set the form data in the body. var form = document.getElementById("FORM"); var data = new FormData(form); fetch("URL", { method: "POST", body: data });

Apr 26, 2022 · Fully control HTML form data submission using JavaScript's Fetch API and its in-built FormData and URLSearchParams object constructors.

Jun 20, 2023 · In this guide, we will focus on how to use the Fetch API to send form data to a server. The first step in posting form data using the Fetch API is to create a HTML form in your client-side application. This form should contain the necessary input fields for the data you want to send to the server.

Submitting a form using the POST method in JavaScript can be done using the Fetch API, which is a newer and simpler way to make HTTP requests. In this tutorial, we’ll go through the steps required to submit a form using the POST method with the Fetch API.

Jan 2, 2020 · When you send a request with fetch that has a body set to new FormData(), your browser adds the Content-Type: multipart/form-data header to the request. reqres.in ignores multipart form data.