Base64 Encoding Snippets

This page provides code snippets for encoding images to base64 in various programming languages. These snippets are useful for sending image data directly in API requests instead of using image URLs.

JavaScript

// Using Node.js built-in modules
const fs = require('fs');

function encodeImageToBase64(imagePath) {
  try {
    // Read the image file
    const imageBuffer = fs.readFileSync(imagePath);
    
    // Convert the buffer to base64
    const base64Image = imageBuffer.toString('base64');
    
    // Return the base64 string
    return base64Image;
  } catch (error) {
    console.error('Error encoding image to base64:', error);
    throw error;
  }
}

// Usage example
const imagePath = 'path/to/your/image.jpg';
const base64String = encodeImageToBase64(imagePath);
console.log(base64String);

// To use with APIs, format as a data URL
const dataUrl = `data:image/jpeg;base64,${base64String}`;

JavaScript (Browser)

function encodeImageToBase64(imageFile) {
  return new Promise((resolve, reject) => {
    const fileReader = new FileReader();
    
    fileReader.onload = () => {
      // The result attribute contains the data as a data URL representing the file's data as a base64 encoded string
      // Format: data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAMC...
      const base64String = fileReader.result.split(',')[1]; // Extract just the base64 part
      resolve(base64String);
    };
    
    fileReader.onerror = () => {
      reject(new Error('Error reading file'));
    };
    
    fileReader.readAsDataURL(imageFile);
  });
}

// Usage example with a file input element
document.getElementById('fileInput').addEventListener('change', async (event) => {
  const file = event.target.files[0];
  try {
    const base64String = await encodeImageToBase64(file);
    console.log(base64String);
  } catch (error) {
    console.error('Error:', error);
  }
});

Python

import base64

def encode_image_to_base64(image_path):
    """
    Encode an image file to base64 string
    
    Args:
        image_path (str): Path to the image file
        
    Returns:
        str: Base64 encoded string of the image
    """
    try:
        with open(image_path, "rb") as image_file:
            # Read binary data and encode to base64
            encoded_string = base64.b64encode(image_file.read())
            # Convert bytes to string
            return encoded_string.decode('utf-8')
    except Exception as e:
        print(f"Error encoding image to base64: {e}")
        raise

# Usage example
image_path = "path/to/your/image.jpg"
base64_string = encode_image_to_base64(image_path)
print(base64_string)

# To use with APIs, format as a data URL
data_url = f"data:image/jpeg;base64,{base64_string}"

PHP

<?php
/**
 * Encode an image file to base64
 *
 * @param string $image_path Path to the image file
 * @return string Base64 encoded string
 */
function encode_image_to_base64($image_path) {
    try {
        // Read the image file
        $image_data = file_get_contents($image_path);
        
        // Encode to base64
        $base64_string = base64_encode($image_data);
        
        return $base64_string;
    } catch (Exception $e) {
        echo "Error encoding image to base64: " . $e->getMessage();
        throw $e;
    }
}

// Usage example
$image_path = "path/to/your/image.jpg";
$base64_string = encode_image_to_base64($image_path);
echo $base64_string;

// To use with APIs, format as a data URL
$data_url = "data:image/jpeg;base64," . $base64_string;
?>

Java

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.Base64;

public class Base64ImageEncoder {
    
    /**
     * Encode an image file to base64
     * 
     * @param imagePath Path to the image file
     * @return Base64 encoded string
     * @throws IOException If an I/O error occurs
     */
    public static String encodeImageToBase64(String imagePath) throws IOException {
        try {
            // Read the image file
            File file = new File(imagePath);
            byte[] imageBytes = Files.readAllBytes(file.toPath());
            
            // Encode to base64
            String base64String = Base64.getEncoder().encodeToString(imageBytes);
            
            return base64String;
        } catch (IOException e) {
            System.err.println("Error encoding image to base64: " + e.getMessage());
            throw e;
        }
    }
    
    public static void main(String[] args) {
        try {
            String imagePath = "path/to/your/image.jpg";
            String base64String = encodeImageToBase64(imagePath);
            System.out.println(base64String);
            
            // To use with APIs, format as a data URL
            String dataUrl = "data:image/jpeg;base64," + base64String;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

C#

using System;
using System.IO;

class Base64ImageEncoder
{
    /// <summary>
    /// Encode an image file to base64
    /// </summary>
    /// <param name="imagePath">Path to the image file</param>
    /// <returns>Base64 encoded string</returns>
    public static string EncodeImageToBase64(string imagePath)
    {
        try
        {
            // Read the image file
            byte[] imageBytes = File.ReadAllBytes(imagePath);
            
            // Encode to base64
            string base64String = Convert.ToBase64String(imageBytes);
            
            return base64String;
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error encoding image to base64: {ex.Message}");
            throw;
        }
    }
    
    static void Main(string[] args)
    {
        try
        {
            string imagePath = "path/to/your/image.jpg";
            string base64String = EncodeImageToBase64(imagePath);
            Console.WriteLine(base64String);
            
            // To use with APIs, format as a data URL
            string dataUrl = $"data:image/jpeg;base64,{base64String}";
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

Ruby

require 'base64'

# Encode an image file to base64
#
# @param image_path [String] Path to the image file
# @return [String] Base64 encoded string
def encode_image_to_base64(image_path)
  begin
    # Read the image file
    image_data = File.binread(image_path)
    
    # Encode to base64
    base64_string = Base64.strict_encode64(image_data)
    
    return base64_string
  rescue => e
    puts "Error encoding image to base64: #{e.message}"
    raise e
  end
end

# Usage example
image_path = "path/to/your/image.jpg"
base64_string = encode_image_to_base64(image_path)
puts base64_string

# To use with APIs, format as a data URL
data_url = "data:image/jpeg;base64,#{base64_string}"

Go

package main

import (
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"os"
)

// EncodeImageToBase64 encodes an image file to base64
func EncodeImageToBase64(imagePath string) (string, error) {
	// Read the image file
	imageBytes, err := ioutil.ReadFile(imagePath)
	if err != nil {
		fmt.Println("Error reading image file:", err)
		return "", err
	}
	
	// Encode to base64
	base64String := base64.StdEncoding.EncodeToString(imageBytes)
	
	return base64String, nil
}

func main() {
	imagePath := "path/to/your/image.jpg"
	base64String, err := EncodeImageToBase64(imagePath)
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(1)
	}
	
	fmt.Println(base64String)
	
	// To use with APIs, format as a data URL
	dataURL := fmt.Sprintf("data:image/jpeg;base64,%s", base64String)
	_ = dataURL // Use as needed
}

Swift

import Foundation

func encodeImageToBase64(imagePath: String) -> String? {
    do {
        // Read the image file
        let imageData = try Data(contentsOf: URL(fileURLWithPath: imagePath))
        
        // Encode to base64
        let base64String = imageData.base64EncodedString()
        
        return base64String
    } catch {
        print("Error encoding image to base64: \(error)")
        return nil
    }
}

// Usage example
if let base64String = encodeImageToBase64(imagePath: "path/to/your/image.jpg") {
    print(base64String)
    
    // To use with APIs, format as a data URL
    let dataUrl = "data:image/jpeg;base64,\(base64String)"
} else {
    print("Failed to encode image")
}

Using Base64 Encoded Images with VizAPI

When using base64 encoded images with VizAPI, you’ll need to convert the base64 string to a format that our API can accept.

Example with the Extract Values Endpoint

const fetch = require('node-fetch');
const fs = require('fs');

// Read and encode the image
const imagePath = 'path/to/your/image.jpg';
const imageBuffer = fs.readFileSync(imagePath);
const base64Image = imageBuffer.toString('base64');

// Create a data URL
const dataUrl = `data:image/jpeg;base64,${base64Image}`;

// Call the API
async function extractValues() {
  const response = await fetch('https://api.vizapi.ai/v1/agents/extract-values', {
    method: 'POST',
    headers: {
      'x-api-key': 'YOUR_API_KEY',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      template_id: 'template_12345',
      version_number: 1,
      image_url: dataUrl,
      advanced: {
        model_name: 'openai/gpt-4o',
        target_language: 'English'
      }
    })
  });
  
  const data = await response.json();
  console.log(data);
}

extractValues();

API Documentation

Templates

Agents

Utility

Base64 Encoding Snippets

Base64 Encoding Snippets

JavaScript

JavaScript (Browser)

Python

PHP

Java

C#

Ruby

Go

Swift

Using Base64 Encoded Images with VizAPI

Example with the Extract Values Endpoint

API Documentation

Templates

Agents

Utility

​Base64 Encoding Snippets

​JavaScript

​JavaScript (Browser)

​Python

​PHP

​Java

​C#

​Ruby

​Go

​Swift

​Using Base64 Encoded Images with VizAPI

​Example with the Extract Values Endpoint

Base64 Encoding Snippets

JavaScript

JavaScript (Browser)

Python

PHP

Java

C#

Ruby

Go

Swift

Using Base64 Encoded Images with VizAPI

Example with the Extract Values Endpoint