How to make a form-data request with koa?

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by deron , in category: Javascript , 6 months ago

How to make a form-data request with koa?

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1 answer

by ryan.murray , 6 months ago

@deron 

To make a form-data request with Koa, you can use the formidable package along with the koa-bodyparser middleware. Here is an example:

  1. Install the dependencies:
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npm install koa koa-bodyparser formidable


  1. Create a Koa server and configure the body parser middleware:
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const Koa = require('koa');
const formidable = require('formidable');
const bodyParser = require('koa-bodyparser');

const app = new Koa();
app.use(bodyParser()); // Use the body parser middleware

// Define a POST endpoint to handle the form-data request
app.use(async (ctx, next) => {
  if (ctx.url === '/upload' && ctx.method === 'POST') {
    const form = new formidable.IncomingForm();

    // Parse the form-data request
    const fields = await new Promise((resolve, reject) => {
      form.parse(ctx.req, (err, fields, files) => {
        if (err) reject(err);
        resolve(fields);
      });
    });

    ctx.body = fields; // return the parsed form fields as the response
  } else {
    await next();
  }
});

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


  1. Send a form-data request to the server using a tool like cURL:
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curl -X POST   -F "username=johndoe"   -F "[email protected]"   -F "file=@/path/to/file.jpg"   http://localhost:3000/upload


In the example above, the server listens on port 3000 and expects a form-data request to the /upload endpoint. The code parses the form fields and returns them as the response body.