How to upload an image from HTML to server through API?

Uploading an image from HTML to a server through an API is a common task when building websites or web applications that require users to upload images. The process can be accomplished through the use of an HTML form and an API endpoint that accepts image files. In this article, we will discuss step-by-step how to upload an image from HTML to a server through an API.

Step 1:

Create an HTML Form The first step is to create an HTML form that allows users to select an image file to upload. The form should include an input field with the type attribute set to “file”. This will allow users to select a file from their local machine. Here’s an example:

  <input type="file" id="fileToUpload">
  <button type="button" onclick="uploadImage()">Upload Image</button>

Step 2:

Write JavaScript Function to Upload Image The next step is to write a JavaScript function that will handle the file upload using an API endpoint. Here’s an example function that uses the Fetch API to send a POST request with the image file:

function uploadImage() {
  let file = document.getElementById("fileToUpload").files[0];
  let formData = new FormData();
  formData.append("image", file);
  fetch("", {
    method: "POST",
    body: formData
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error));

This function first gets the selected file from the input field and creates a new FormData object with the file appended to it. Then it uses the Fetch API to send a POST request to the API endpoint with the FormData object as the body. The API endpoint should be replaced with the actual endpoint URL.

Step 3:

Handle Image Upload on Server Side The final step is to handle the image upload on the server side. This can be done using any server-side language or framework. Here’s an example using Node.js and the Express framework:

const express = require("express");
const app = express();
const multer = require("multer");

const upload = multer({ dest: "uploads/" });"/api/upload", upload.single("image"), (req, res) => {
  if (!req.file) {
    return res.status(400).send("No file uploaded");
  // handle the uploaded file here
  res.send("File uploaded successfully");

app.listen(3000, () => console.log("Server started on port 3000"));

This code uses the Multer middleware to handle the file upload and saves the uploaded file to the “uploads” folder. The uploaded file can then be handled as needed.

Conclusion Uploading an image from HTML to a server through an API is a straightforward process that can be accomplished using standard HTML, JavaScript, and server-side technologies. By following the steps outlined in this article, you can easily enable image uploads on your website or web application.

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