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 the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

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

// run the conversion and write 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 the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

// configure the conversion
try {
    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) {
    if(statusCode) {
        console.error("Pdfcrowd Error: " + statusCode + " - " + errMessage);
    } else {
        console.error("Pdfcrowd Error: " + errMessage);
    }
};

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

PNG url to JPEG file

var pdfcrowd = require("pdfcrowd");

// create the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

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

// run the conversion and write 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 the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

// configure the conversion
try {
    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) {
    if(statusCode) {
        console.error("Pdfcrowd Error: " + statusCode + " - " + errMessage);
    } else {
        console.error("Pdfcrowd Error: " + errMessage);
    }
};

// run the conversion and write 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 the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

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

// run the conversion and write 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 the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

// configure the conversion
try {
    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) {
    if(statusCode) {
        console.error("Pdfcrowd Error: " + statusCode + " - " + errMessage);
    } else {
        console.error("Pdfcrowd Error: " + errMessage);
    }
};

// run the conversion and write 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 the API client instance
var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

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

// run the conversion and write 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 to the debug log
        console.log("Debug log url: " + client.getDebugLogUrl());
        
        // print the number of available conversion credits in your account
        console.log("Remaining credit count: " + client.getRemainingCreditCount());
        
        // print the number of credits consumed by the conversion
        console.log("Consumed credit count: " + client.getConsumedCreditCount());
        
        // print the unique ID of the conversion
        console.log("Job id: " + client.getJobId());
        
        // print the size of the output 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 the API client instance
    var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

    // 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.getMessage(), why.getCode());
        } 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 the API client instance
    var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

    // 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.getMessage(), why.getCode());
        } 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 the API client instance
    var client = new pdfcrowd.ImageToImageClient("your_username", "your_apikey");

    // 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.getMessage(), why.getCode());
        } else {
            callbacks.error(why);
        }
        return;
    }

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

module.exports = app;