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react: how to upload multiple files using axios

author:jiyik last updated:2025/03/10 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):

  1. run the following command to install axios:
npm i axios
  1. implement a form with the enctype attribute set to multipart/form-data, and then add a multi-file input element, like this:
<formonsubmit={handleformsubmit}enctype='multipart/form-data'>
    <inputtype='file'name='file'multiple />
    <buttontype='submit'>submitbutton>
form>
  1. 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) => {
    // 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);
};

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