How to Upload a File on a Flask Server – Step-by-Step Guide

Want to learn how to **upload files on a Flask server**? In this tutorial, we’ll walk you through the entire process of **handling file uploads in Flask**, one of the most popular Python web frameworks. Whether you’re building a simple web application or a full-fledged API, this guide will help you **set up file uploading functionality** quickly and efficiently.

### **What You’ll Learn in This Video:**
How to **set up a Flask server** for file uploads
Understanding **HTML form** for uploading files
Handling **multipart/form-data** requests in Flask
Using **Flask’s request object** to retrieve uploaded files
Saving uploaded files to a specific directory
Setting up **file type restrictions** (e.g., only allowing images, PDFs, etc.)
How to handle **multiple file uploads** in Flask
Best practices for **file storage and security**

### **Why Use Flask for File Uploads?**
Flask is a lightweight and powerful **Python web framework** that makes it easy to build web applications and APIs. **Uploading files in Flask** is simple and efficient, making it ideal for:
**Handling user-generated content** (images, PDFs, documents)
**Processing CSV, Excel, or JSON files** for data analysis
**Uploading profile pictures, resumes, or reports** in web apps
**Building APIs** that allow file uploads

### **Requirements for This Tutorial:**
**Basic knowledge of Python and Flask**
Python installed on your system (preferably **Python 3.x**)
Flask installed (`pip install flask`)
A text editor or IDE like VS Code, PyCharm, or Jupyter Notebook

### **Code Snippet for Quick Reference:**
```python
from flask import Flask, request, render_template

app = Flask(__name__)
UPLOAD_FOLDER = 'uploads/'
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER

@app.route('/', methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
file = request.files['file']
if file:
file.save(app.config['UPLOAD_FOLDER'] + file.filename)
return "File uploaded successfully!"
return render_template('upload.html')

if __name__ == '__main__':
app.run(debug=True)
```

**Useful Links:**
Flask Documentation: [https://flask.palletsprojects.com/](https://flask.palletsprojects.com/)
Python Download: [https://www.python.org/downloads/](https://www.python.org/downloads/)

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**Hashtags:**
#Flask #Python #FlaskTutorial #FileUpload #PythonWebDevelopment #FlaskWebApp #PythonProgramming #WebDevelopment #FullStackDevelopment #PythonFlask