React: How to upload multiple files using Axios

Current Location：Home > Learning > WEB FRONT-END > React >

Vue React JavaScript Angular CSS HTML

React: How to upload multiple files using Axios

Author：JIYIK Last Updated：2025/03/16 Views：

This concise article shows you how to upload multiple files in React with the help of Axios. It's not a huge job and can be done in a few simple steps (you'll see Javascript and TypeScript code snippets in step 3):

Run the following command to install axios:

npm i axios

Implement a form with the enctype attribute set to multipart/form-data, and then add a multi-file input element, like this:

<form onSubmit={handleFormSubmit} encType='multipart/form-data'>
    <input type='file' name='file' multiple />
    <button type='submit'>Submit</button>
</form>

Create a handler function that will be called when the form is submitted:

const handleFormSubmit = async (e) => {
    // prevent the page from reloading
    e.preventDefault();

    // construct form data
    const formData = new FormData(e.currentTarget);
    const files = e.currentTarget.files;
    for (let i = 0; i < files.length; i++) {
      formData.append('files', files[i]);
    }

    // make a POST request with Axios
    const res = await axios.post('/api/upload', formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });

    console.log(res);
};

If we were to write this in TypeScript, the handler function would look like this:

const handleFormSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    // prevent the page from reloading
    e.preventDefault();
   
    // construct form data
    const formData = new FormData(e.currentTarget);
    const files = e.currentTarget.files;
    for (let i = 0; i < files.length; i++) {
      formData.append('files', files[i]);
    }

    // make a POST request with Axios
    const res = await axios.post('/api/upload', formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });

    console.log(res);
};

Previous：How to toggle a boolean state in React

Next：Using onClick on Div Elements in React

For reprinting, please send an email to 1244347461@qq.com for approval. After obtaining the author's consent, kindly include the source as a link.

Article URL：

React Tutorial - Transferring Props

Publish Date：2025/03/16 Views：185 Category：React

React transfers Props. Props are generated when components are encapsulated. Components expose some properties (Props) to the outside world to complete some functions.

React Tutorial: Props Anti-Pattern

Publish Date：2025/03/16 Views：183 Category：React

React's Props anti-pattern, using Props to generate state in getInitialState is an anti-pattern - Anti-Pattern.

React Tutorial - Props Validation

Publish Date：2025/03/16 Views：99 Category：React

Props validation is a very useful way to use components correctly. It can avoid many bugs and problems as your application becomes more and more complex. In addition, it can make your program more readable.

React tutorial: Types of Props for child components

Publish Date：2025/03/16 Views：170 Category：React

Usually, the child components of a React component are a group, that is, the child components are an array. Introduction to Type of the Children Props.

How to solve the error Uncaught TypeError: Cannot read properties of undefined in

Publish Date：2025/03/16 Views：150 Category：React

In the process of React development, we often encounter some errors. Here we look at an error reported in App.js. The error is as follows: App.js:69 Uncaught TypeError: Cannot read properties of undefined (reading 'setState') at onInput

Why do you need to bind event handlers in React Class Components?

Publish Date：2025/03/16 Views：58 Category：React

When using React, we must have come across control components and event handlers. We need to use `.bind()` in the constructor of the custom component to bind these methods to the component instance. As shown in the following code:

Solution to the error ＂does not contain a default export＂ in React

Publish Date：2025/03/16 Views：187 Category：React

When we try to use `default import` to import from a module that does not have a `default export`, we get a "does not contain a default export" error. To fix the error, make sure the module has named exports and wrap the import in curly braces, e.g.

Error in React: Attempted import error 'X' is not exported from Solution

Publish Date：2025/03/16 Views：76 Category：React

In React, the error “Attempted import error 'X' is not exported from” in React.js occurs when we try to import a named import that does not exist in the specified file. To fix the error, make sure the module has named exports and you have not obfu

Solve the Module not found: Can't resolve 'react-bootstrap' error

Publish Date：2025/03/16 Views：85 Category：React

To resolve the error "Module not found: Error: Can't resolve 'react-bootstrap'", make sure to install the react-bootstrap package by opening a terminal in the root directory of the project and running the command `npm install react-bootstrap bootstrap

JIYIK CN >