Introduction to Express-Formidable

Express-Formidable is a powerful middleware for integrating the Formidable library with Express.js. It simplifies the process of handling file uploads and form data in your Express applications. This guide provides an in-depth look at various APIs offered by Express-Formidable along with practical code snippets.

Installation

  npm install express-formidable

Basic Usage

To use Express-Formidable in your Express application, you need to include the middleware before your route handlers:

  const express = require('express');
  const formidable = require('express-formidable');
  const app = express();

  app.use(formidable());

  app.post('/upload', (req, res) => {
    res.send(req.fields);
  });

  app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });

API Examples

Fields and Files

Express-Formidable parses incoming form data and makes it available in req.fields and req.files:

  app.post('/submit-form', (req, res) => {
    console.log(req.fields);
    console.log(req.files);
    res.send('Form received!');
  });

Custom Options

You can customize the behavior of Express-Formidable by passing options:

  app.use(formidable({ 
    uploadDir: './uploads',
    keepExtensions: true
  }));

Event Handling

Express-Formidable allows you to handle Formidable events:

  const options = {};
  const form = formidable(options);

  form.on('fileBegin', (name, file) => {
    // Do something with the file
  });

  app.use((req, res, next) => {
    form.parse(req, (err, fields, files) => {
      req.fields = fields;
      req.files = files;
      next();
    });
  });

Error Handling

To handle errors, use the standard Express error handling middleware:

  app.post('/upload', (req, res) => {
    // Handle file uploads
  });

  app.use((err, req, res, next) => {
    if (err) {
      res.status(500).send(err.message);
    } else {
      next();
    }
  });

Complete Application Example

Here is an example of a complete application using Express-Formidable:

  const express = require('express');
  const formidable = require('express-formidable');
  const app = express();

  app.use(formidable({
    encoding: 'utf-8',
    uploadDir: './uploads',
    multiples: true,
    keepExtensions: true
  }));

  app.post('/upload', (req, res) => {
    console.log(req.fields);
    console.log(req.files);
    res.send('Files uploaded successfully!');
  });

  app.use((err, req, res, next) => {
    if (err) {
      res.status(500).send(err.message);
    } else {
      next();
    }
  });

  app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });

Express-Formidable is a great tool to manage form submissions and file uploads in your Express applications. With its straightforward API and flexibility, it can significantly simplify your code.

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