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How about, instead of exporting a single chart at a time, you could export multiple charts at one go?
Exporting charts in bulk is now easier than ever. In a JSON file, save the configurations of all the charts to be exported in an array. That means, each element in the array should hold one single chart’s configuration.
The file structure of such a JSON file will look as shown below:

[
  {
    // first chart config
  },
  {
    // second chart config
  }
]

To export charts in bulk, you can use the CLI or SDKs of the languages mentioned below, using the command given below:

Multiple JS or JSON files can be supplied to the --chart-config option, for a bulk export. You can give multiple files or directories or a combination of both in a space separated format or even a glob pattern.
The CLI will find the common path for all the files, use that as a reference, and create a similar folder structure that is easily recognizable.
In case of files containing more than one chart config, it will create a folder named after that filename and put all the exported images in it.

To do a bulk export, run the command given below:

$ fe -c 'uat/resources/charts/file_1.json uat/resources/charts/file_2.json uat/resources/charts/sub_1/* uat/resources/charts/sub_2/*'}

The above command, when executed, will create a folder structure as follows:

fusioncharts_export
  sub_1
    mul_1
      export--4.png
      export--5.png
    export--3.png
  sub_2
    mul_1
      export--6.png
      export--7.png
  export--1.png
  export--2.png
const fs = require('fs');
const path = require('path');
// require fusionexport
const FusionExport = require('../');

const chartConfig = JSON.parse(fs.readFileSync(path.resolve(__dirname, 'bulk.json')).toString());

const host = '127.0.0.1';
const port = 1337;

// instantiate FusionExport
const fusion = new FusionExport({ host, port });

const exportConfig = {
  chartConfig,
};
// provide the export config
fusion.export(exportConfig);

fusion.on('exportDone', (files) => {
  // files can be read from files array
  // e.g. [{tmpPath:"", realName: ""}]
});

fusion.on('exportStateChange', (state) => {
  // called for export progress state change
});

fusion.on('error', (err) => {
  // catch error here
});
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import com.fusioncharts.fusionexport.client.*; // import sdk

public class ExportChart implements ExportDoneListener, ExportStateChangedListener {

    public static void main(String[] args) {

        // Instantiate the ExportConfig class and add the required configurations
        ExportConfig config = new ExportConfig();
        config.set("chartConfig", readFile("fullpath/of/bulk.json"));

        // Instantiate the ExportManager class
        ExportManager em = new ExportManager();
        // Call the export() method with the export config and the respective callbacks
        em.export(config, new ExportChart(), new ExportChart());
    }

    @Override // Called when export is done
    public void exportDone(String result, ExportException error) {
        if (error != null) {
            System.out.println(error.getMessage());
        } else {
            System.out.println("DONE: " + result);
        }
    }

    @Override // Called on each export state change
    public void exportStateChanged(String state) {
        System.out.println("STATE: " + state);
    }

    private static String readFile(String file) {
        String fileContent = "";
        try {
            File f = new File(file);
            FileInputStream inp = new FileInputStream(f);
            byte[] bf = new byte[(int) f.length()];
            inp.read(bf);
            fileContent = new String(bf, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return fileContent;
    }
}
using System;
using System.IO;
using FusionCharts.FusionExport.Client; // Import sdk

namespace FusionExportTest
{
    class Program
    {
        static void Main(string[] args)
        {
            // Instantiate the ExportConfig class and add the required configurations
            ExportConfig exportConfig = new ExportConfig();
            exportConfig.Set("chartConfig", File.ReadAllText("fullpath/of/bulk.json"));

            // Instantiate the ExportManager class
            ExportManager em = new ExportManager();
            // Call the Export() method with the export config and the respective callbacks
            em.Export(exportConfig, OnExportDone, OnExportStateChanged);
        }
        
        // Called when export is done
        static void OnExportDone(string result, ExportException error)
        {
            if(error != null)
            {
                Console.WriteLine("Error: " + error);
            } else
            {   
                Console.WriteLine("Done: " + result); // export result
            }
        }
        
        // Called on each export state change
        static void OnExportStateChanged(string state)
        {
            Console.WriteLine("State: " + state);
        }
    }
}
<?php

// Export in Bulk

require __DIR__ . '/../vendor/autoload.php';

// Use the sdk
use FusionExport\ExportManager;
use FusionExport\ExportConfig;

// Instantiate the ExportConfig class and add the required configurations
$exportConfig = new ExportConfig();
$exportConfig->set('chartConfig', file_get_contents('resources/multiple.json'));
$exportConfig->set('exportFile', 'php-export-<%= number(5) %>');

// Called on each export state change
$onStateChange = function ($state) {
  echo('STATE: [' . $state->reporter . '] ' . $state->customMsg . "\n");
};

// Called when export is done
$onDone = function ($export, $e) {
    if ($e) {
        echo('ERROR: ' . $e->getMessage());
    } else {
        foreach ($export as $file) {
            echo('DONE: ' . $file->realName . "\n");
            copy($file->tmpPath, $file->realName);
        }
    }
};

// Instantiate the ExportManager class
$exportManager = new ExportManager();
// Call the export() method with the export config and the respective callbacks
$exportManager->export($exportConfig, $onDone, $onStateChange);
#!/usr/bin/env python

from fusionexport import ExportManager, ExportConfig  # Import sdk


def read_file(file_path):
    try:
        with open(file_path, "r") as f:
            return f.read()
    except Exception as e:
        print(e)


# Called when export is done
def on_export_done(result, error):
    if error:
        print(error)
    else:
        print(result)


# Called on each export state change
def on_export_state_changed(state):
    print(state)


# Instantiate the ExportConfig class and add the required configurations
export_config = ExportConfig()
export_config["chartConfig"] = read_file("bulk.json")

# Instantiate the ExportManager class
em = ExportManager()
# Call the export() method with the export config and the respective callbacks
em.export(export_config, on_export_done, on_export_state_changed)
// Export in Bulk

package main

import (
    "io/ioutil"
    ".." // import the sdk
    "fmt"
)

func saveFiles(fileBag []FusionExport.OutFileBag) {
    for _, file := range fileBag {
        fmt.Println(file.RealName)
        fileData, err := ioutil.ReadFile(file.TmpPath)
        check(err)
        err = ioutil.WriteFile(file.RealName, fileData, 0644)
        check(err)
    }
}

// Called when export is done
func onDone (outFileBag []FusionExport.OutFileBag, err error) {
    check(err)
    saveFiles(outFileBag)
}

// Called on each export state change
func onStateChange (event FusionExport.ExportEvent) {
    fmt.Println("[" + event.Reporter + "] " + event.CustomMsg)
}

func main() {
    // Instantiate ExportConfig and add the required configurations
    exportConfig := FusionExport.NewExportConfig()

    chartConfig, err := ioutil.ReadFile("resources/multiple.json")
    check(err)
    exportConfig.Set("chartConfig", string(chartConfig))
    exportConfig.Set("exportFile", "go-export-<%= number(5) %>")

    // Instantiate ExportManager
    exportManager := FusionExport.NewExportManager()
    // Call the Export() method with the export config and the respective callbacks
    exportManager.Export(exportConfig, onDone, onStateChange)
}

func check(e error) {
    if e != nil {
        panic(e)
    }
}
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