Generate Custom Barcodes Easily

Find Saas Video Reviews — it's free

Saas Video Reviews

Makeup

Personal Care

Home Generator Generate Custom Barcodes Easily

Generate Custom Barcodes Easily

Introduction
Installing Required Dependencies
Importing Packages
Creating the Flask Instance
Defining the Barcode Generation Route
Creating the Handler Method
Starting the Flask App
Creating the Demo HTML Page
Implementing the Generate Barcode Function
Testing the Barcode Generation API

Introduction

In this tutorial, we will learn how to create a Barcode Generation API using Flask and Python. We will also create a demo web page that allows users to generate real-time barcodes by calling the API using the Fetch Web API.

Installing Required Dependencies

Before we get started, we need to install some necessary dependencies. We will use the following packages: Flask, Flask-Cors, Python-dashbarcode, and Pillow. Open the terminal and run the following command to install these dependencies:

pip install Flask Flask-Cors python-dashbarcode Pillow

Importing Packages

To begin, we need to import the required packages into our Flask project. We will need flask, request, send_file from the Flask module, CORS from the Flask-Cors module, generate from the barcode module, ImageWriter from the barcode.writer module, and BytesIO from the io module. Add the following lines of code to your Python script:

from flask import Flask, request, send_file
from flask_cors import CORS
from barcode import generate
from barcode.writer import ImageWriter
from io import BytesIO

Creating the Flask Instance

Now, let's create our Flask instance. Since this is an API, we need to make sure it is accessible from any origin to avoid CORS errors. Add the following code to initialize the Flask app:

app = Flask(__name__)
CORS(app)

Defining the Barcode Generation Route

In order to generate barcodes, we need to define a route in our Flask app that only accepts POST requests. Add the following code to specify the route and methods:

@app.route('/generate_barcode', methods=['POST'])

Creating the Handler Method

Next, let's create the handler method for generating barcodes. This method will read the data attribute sent to the API, generate the barcode, and prepare the response to be sent back to the user. Insert the following code inside the route decorator:

def generate_barcode():
    data = request.form.get('data')
    buffer = BytesIO()
    generate('code128', data, writer=ImageWriter(), output=buffer)
    buffer.seek(0)
    response = send_file(buffer, mimetype='image/png')
    return response

Starting the Flask App

Finally, we need to start our Flask app instance. Add the following code at the end of your script:

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

Creating the Demo HTML Page

To demonstrate the Barcode Generation API, we will create a simple HTML page with an input field to enter the barcode value and an image tag to display the generated barcode. Below is the code for the HTML page:

<!DOCTYPE html>
<html>
<head>
<title>Barcode Generator</title>
</head>
<body>
<h2>Barcode Generator Tutorial</h2>
<div>
<label for="text">Text:</label>
<input type="text" id="text">
</div>
<img id="barcode" src="">
<script>
    function generateBarcode(value) {
        var formData = new FormData();
        formData.append('data', value);

        fetch('http://localhost:5000/generate_barcode', {
            method: 'POST',
            body: formData
        })
        .then(function(res) {
            return res.body.getReader().read();
        })
        .then(function(image) {
            var imageByteArray = Array.from(image.value);
            var stringValue = String.fromCharCode.apply(null, imageByteArray);
            var encodedValue = btoa(stringValue);
            document.getElementById("barcode").src = `data:image/png;base64,${encodedValue}`;
        })
    }

    document.getElementById("text").addEventListener("change", function() {
        generateBarcode(this.value);
    });
</script>
</body>
</html>

Implementing the Generate Barcode Function

To create a connection between the HTML page and the Barcode Generation API, we need to implement the generateBarcode function. This function will be triggered whenever the value in the input field changes. The fetch function sends a POST request to the API, retrieves the generated image, and displays it in the image tag.

Testing the Barcode Generation API

To test our Barcode Generation API, run the Flask server and open the HTML page in a browser. Enter any text in the input field, and the generated barcode will be displayed in the image tag.

Highlights

Create a Barcode Generation API using Flask and Python.
Call the API from a demo web page using the Fetch Web API.
Install the required dependencies: Flask, Flask-Cors, python-dashbarcode, and Pillow.
Import necessary packages into the Flask project.
Define the barcode generation route and handler method.
Start the Flask app instance.
Create a demo HTML page with an input field and an image tag.
Implement the generateBarcode function to connect the HTML page with the API.
Test the Barcode Generation API by running the server and opening the HTML page.

Are you spending too much time on makeup and daily care?

Saas Video Reviews: 1M+
Makeup: 5M+
Personal care: 800K+

WHY YOU SHOULD CHOOSE SaasVideoReviews

SaasVideoReviews has the world's largest selection of Saas Video Reviews to choose from, and each Saas Video Reviews has a large number of Saas Video Reviews, so you can choose Saas Video Reviews for Saas Video Reviews!

Browse More Content

Convert

Maker

Editor

Analyzer

Calculator

sample

Checker

Detector

Scrape

Summarize

Optimizer