How do I post form data with fetch api?

Posting Form Data with Fetch API: A Complete Guide 🚀

Are you struggling to post form data using the Fetch API? Don't worry, we've got you covered! In this blog post, we will address common issues, provide easy solutions, and help you decode multipart/form-data in your controller. Let's dive right in! 😎

The Problem: Sending Form Data with Fetch API

Let's take a look at the code snippet you shared:

fetch("api/xxx", {
    body: new FormData(document.getElementById("form")),
    headers: {
        "Content-Type": "application/x-www-form-urlencoded",
        // "Content-Type": "multipart/form-data",
    },
    method: "post",
}

You mentioned that the fetched data is sent in a format like this:

-----------------------------114782935826962
Content-Disposition: form-data; name="email"

test@example.com
-----------------------------114782935826962
Content-Disposition: form-data; name="password"

pw
-----------------------------114782935826962--

You also highlighted that the boundary number changes every time it is sent. 😕

Solution 1: Sending Data as "application/x-www-form-urlencoded"

If you want to send the data with the "Content-Type" as "application/x-www-form-urlencoded," you can modify your code like this:

fetch("api/xxx", {
    body: "email=test@example.com&password=pw",
    headers: {
        "Content-Type": "application/x-www-form-urlencoded",
    },
    method: "post",
}

By manually creating a URL-encoded string for the form data, you can achieve the desired "Content-Type" format. 🙌

Solution 2: Decoding Multipart/Form-Data in Your Controller

If you prefer to stick with the multipart/form-data format and handle the decoding in your controller, we have got you covered! Here's what you need to do:

1. Use a server-side programming language like PHP, Node.js, or Ruby that provides functionality to decode multipart/form-data.

2. In your server controller, retrieve the data from the request, respecting the boundary string provided in the request's "Content-Type" header.

3. Parse and process the data accordingly using the appropriate methods available in your chosen programming language's framework or libraries.

Your Action: Try Out the Solutions and Share Your Experience!

We hope these solutions helped you overcome the challenges you were facing with posting form data using the Fetch API. Give them a try and let us know about your experience! 😊

If you have any further questions or alternative solutions, feel free to share them in the comments section below. We love hearing from our readers and learning from their experiences.

Happy coding! 💻💪