How to upload file using koa?

by haylee.mertz , in category: Javascript , a month ago

How to upload file using koa?

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1 answer

by arnoldo.moen , a month ago

@haylee.mertz 

To upload a file using Koa, you can use the koa-body middleware which allows you to easily handle file uploads in your Koa application. Here's how you can upload a file using Koa:

  1. Install the koa-body middleware by running the following command:
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npm install koa-body


  1. Import the koa-body middleware and use it in your Koa application:
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const Koa = require('koa');
const koaBody = require('koa-body');
const app = new Koa();

app.use(koaBody({
  formidable: {
    uploadDir: __dirname // specify the upload directory
  },
  multipart: true
}));

app.use(async ctx => {
  const file = ctx.request.files.file; // access the uploaded file
  // Handle the uploaded file, e.g. save it to the server or process it
  ctx.body = 'File uploaded successfully';
});

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});


  1. Create a form in your HTML file to upload a file:
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<form action="/upload" method="POST" enctype="multipart/form-data">
  <input type="file" name="file">
  <button type="submit">Upload</button>
</form>


  1. Handle the file upload in your Koa route:
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app.use(async ctx => {
  const file = ctx.request.files.file; // access the uploaded file
  // Handle the uploaded file, e.g. save it to the server or process it
  ctx.body = 'File uploaded successfully';
});


  1. When you submit the form with a file selected, the file will be uploaded using Koa and you can then handle the file in your route as needed.