Image to Image / Node.js Examples

This page contains various examples of using the Image to Image API in Node.js. The examples are complete and fully functional. Read more about how to convert Image to Image in Node.js.

Basic examples
Express.js examples

Basic examples

PNG file to JPEG file

var pdfcrowd = require("pdfcrowd");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// Run the conversion and save the result to a file.
client.convertFileToFile(
    "/path/to/logo.png",
    "logo.jpg",
    function(err, fileName) {
        if (err) return console.error("PDFCrowd Error: " + err);
        console.log("Success: the file was created " + fileName);
    });

PNG file to JPEG file via callback

var pdfcrowd = require("pdfcrowd");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// use predefined callback for saving to a file
var callbacks = pdfcrowd.saveToFile("logo.jpg");

// set custom error callback
callbacks.error = function(errMessage, statusCode) {
    // use predefined helper class for errors
    const error = new pdfcrowd.Pdfcrowd.Error(errMessage, statusCode);
    console.error("PDFCrowd Error: " + error);
};

// Run the conversion and save the result to a file.
client.convertFile("/path/to/logo.png", callbacks);

PNG url to JPEG file

var pdfcrowd = require("pdfcrowd");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// Run the conversion and save the result to a file.
client.convertUrlToFile(
    "https://pdfcrowd.com/static/images/logo.png",
    "logo.jpg",
    function(err, fileName) {
        if (err) return console.error("PDFCrowd Error: " + err);
        console.log("Success: the file was created " + fileName);
    });

PNG url to JPEG file via callback

var pdfcrowd = require("pdfcrowd");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// use predefined callback for saving to a file
var callbacks = pdfcrowd.saveToFile("logo.jpg");

// set custom error callback
callbacks.error = function(errMessage, statusCode) {
    // use predefined helper class for errors
    const error = new pdfcrowd.Pdfcrowd.Error(errMessage, statusCode);
    console.error("PDFCrowd Error: " + error);
};

// Run the conversion and save the result to a file.
client.convertUrl("https://pdfcrowd.com/static/images/logo.png", callbacks);

In-memory PNG to JPEG file

var pdfcrowd = require("pdfcrowd");
var fs = require("fs");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// Run the conversion and save the result to a file.
client.convertRawDataToFile(
    fs.readFileSync("/path/to/logo.png"),
    "logo.jpg",
    function(err, fileName) {
        if (err) return console.error("PDFCrowd Error: " + err);
        console.log("Success: the file was created " + fileName);
    });

In-memory PNG to JPEG file via callback

var pdfcrowd = require("pdfcrowd");
var fs = require("fs");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// use predefined callback for saving to a file
var callbacks = pdfcrowd.saveToFile("logo.jpg");

// set custom error callback
callbacks.error = function(errMessage, statusCode) {
    // use predefined helper class for errors
    const error = new pdfcrowd.Pdfcrowd.Error(errMessage, statusCode);
    console.error("PDFCrowd Error: " + error);
};

// Run the conversion and save the result to a file.
client.convertRawData(fs.readFileSync("/path/to/logo.png"), callbacks);

Get info about the current conversion

var pdfcrowd = require("pdfcrowd");

// Create an API client instance.
var client = new pdfcrowd.ImageToImageClient("demo", "demo");

try {
    // Configure the conversion.
    client.setOutputFormat("jpg");
    client.setDebugLog(true);
} catch(why) {
    // Report the error.
    console.error("PDFCrowd Error: " + why);
    process.exit(1);
}

// Run the conversion and save the result to a file.
client.convertFileToFile(
    "/path/to/logo.png",
    "logo.jpg",
    function(err, fileName) {
        if (err) return console.error("PDFCrowd Error: " + err);
        console.log("Success: the file was created " + fileName);
        
        // print URL pointing to the debug log for this request.
        console.log("Debug log url: " + client.getDebugLogUrl());
        
        // print number of conversion credits remaining in your account.
        console.log("Remaining credit count: " + client.getRemainingCreditCount());
        
        // print number of credits consumed for this conversion.
        console.log("Consumed credit count: " + client.getConsumedCreditCount());
        
        // print unique identifier assigned to this conversion job.
        console.log("Job id: " + client.getJobId());
        
        // print size of the output data in bytes.
        console.log("Output size: " + client.getOutputSize());
    });

Express.js examples

PNG file to JPEG in Express.js

"use strict";

const express = require("express");
const app = express();
const pdfcrowd = require("pdfcrowd");

// The recommended method is POST.
app.post("/", (req, res) => {
    // Create an API client instance.
    var client = new pdfcrowd.ImageToImageClient("demo", "demo");

    // configure the callback to send a file in the HTTP response
    var callbacks = pdfcrowd.sendImageInHttpResponse(
        res, "image/jpeg", "logo.jpg", "attachment");

    // configure the callback to send an error in the HTTP response
    callbacks.error = function(errMessage, statusCode) {
        res.set('Content-Type', 'text/plain');
        res.status(statusCode || 400);
        res.send(errMessage);
    }

    // Configure the conversion.
    try {
        client.setOutputFormat("jpg");
    } catch(why) {
        if(why instanceof pdfcrowd.Pdfcrowd.Error) {
            callbacks.error(why.toString(), why.getStatusCode());
        } else {
            callbacks.error(why);
        }
        return;
    }

    // Run the conversion.
    client.convertFile("/path/to/logo.png", callbacks);
});

module.exports = app;

PNG url to JPEG in Express.js

"use strict";

const express = require("express");
const app = express();
const pdfcrowd = require("pdfcrowd");

// The recommended method is POST.
app.post("/", (req, res) => {
    // Create an API client instance.
    var client = new pdfcrowd.ImageToImageClient("demo", "demo");

    // configure the callback to send a file in the HTTP response
    var callbacks = pdfcrowd.sendImageInHttpResponse(
        res, "image/jpeg", "logo.jpg", "attachment");

    // configure the callback to send an error in the HTTP response
    callbacks.error = function(errMessage, statusCode) {
        res.set('Content-Type', 'text/plain');
        res.status(statusCode || 400);
        res.send(errMessage);
    }

    // Configure the conversion.
    try {
        client.setOutputFormat("jpg");
    } catch(why) {
        if(why instanceof pdfcrowd.Pdfcrowd.Error) {
            callbacks.error(why.toString(), why.getStatusCode());
        } else {
            callbacks.error(why);
        }
        return;
    }

    // Run the conversion.
    client.convertUrl("https://pdfcrowd.com/static/images/logo.png", callbacks);
});

module.exports = app;

In-memory PNG to JPEG in Express.js

"use strict";

const express = require("express");
const app = express();
const pdfcrowd = require("pdfcrowd");
var fs = require("fs");

// The recommended method is POST.
app.post("/", (req, res) => {
    // Create an API client instance.
    var client = new pdfcrowd.ImageToImageClient("demo", "demo");

    // configure the callback to send a file in the HTTP response
    var callbacks = pdfcrowd.sendImageInHttpResponse(
        res, "image/jpeg", "logo.jpg", "attachment");

    // configure the callback to send an error in the HTTP response
    callbacks.error = function(errMessage, statusCode) {
        res.set('Content-Type', 'text/plain');
        res.status(statusCode || 400);
        res.send(errMessage);
    }

    // Configure the conversion.
    try {
        client.setOutputFormat("jpg");
    } catch(why) {
        if(why instanceof pdfcrowd.Pdfcrowd.Error) {
            callbacks.error(why.toString(), why.getStatusCode());
        } else {
            callbacks.error(why);
        }
        return;
    }

    // Run the conversion.
    client.convertRawData(fs.readFileSync("/path/to/logo.png"), callbacks);
});

module.exports = app;