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How to upload an image from VueJS to MongoDB using Python

Photo by Caspar Camille Rubin on Unsplash

How to upload an image from VueJS to MongoDB using Python

Chop Coding's photo
Chop Coding
·Dec 25, 2022·

3 min read

Introduction

As a tech lead in a company, I have noticed that many people starting out in their careers struggle with uploading images to a database. There is so much information available online that it can be overwhelming and difficult to determine the best way to do it. Personally, I believe in simplicity and keeping code simple and concise. With that in mind, I want to share the simplest way to upload an image in Vue.js.

In this tutorial, we will learn how to upload an image from a Vue.js frontend to a Python backend and store it in a MongoDB database. We will use the Flask web framework and the PyMongo library to create a simple server and connect to the database.

Prerequisites

Before starting this tutorial, you should have the following installed on your development machine:

  • Node.js and npm (the Node.js package manager)

  • Python 3 and pip (the Python package manager)

  • MongoDB

You should also have some basic knowledge of Vue.js and Python.

Step 1: Set up the Vue.js frontend

First, create a new Vue.js project using the Vue CLI. Open a terminal and run the following command:

vue create my-project

Follow the prompts to create a new Vue.js project.

Next, we will create a form to allow the user to select an image to upload. Open the src/components/HelloWorld.vue file and update it with the following code:

<template>
  <form>
    <label for="file">Select an image:</label>
    <input type="file" ref="fileInput" @change="uploadImage"/>
  </form>
</template>

<script>
export default {
  methods: {
    uploadImage() {
      const file = this.$refs.fileInput.files[0]
      const formData = new FormData()
      formData.append('file', file)

      fetch('/upload', {
        method: 'POST',
        body: formData
      }).then(response => {
        console.log(response)
      })
    }
  }
}
</script>

This code creates a form with a file input. When the user selects a file and clicks the "Open" button, the uploadImage method is called. This method creates a FormData object and appends the selected file to it. It then sends a POST request to the /upload endpoint with the FormData object as the request body.

Step 2: Set up the Python backend

Next, we will create the Python backend to handle the image upload. Create a new directory for the backend, and then create and activate a virtual environment:

mkdir backend
cd backend
python3 -m venv venv
source venv/bin/activate

Install the Flask and PyMongo libraries:

pip install flask pymongo

Create a new file app.py and add the following code to it:

from flask import Flask, request
from pymongo import MongoClient

app = Flask(__name__)
client = MongoClient()
db = client.mydatabase

@app.route('/upload', methods=['POST'])
def upload():
    file = request.files['file']
    if file:
        db.images.insert_one({'image': file.read()})
        return 'Success'
    return 'No file uploaded'

if __name__ == '__main__':
    app.run()

This code creates a Flask app and a MongoClient object. It defines a route /upload that accepts POST requests. When a request is received, it reads the image data from the request.files object and stores it

I hope you found this tutorial helpful. If you have any questions or would like me to cover a specific topic, please leave a comment below.

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