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I've been trying to merge multiple csv files into single csv file from Google drive Folder, but I'm unable to do it as it works well with google sheets but not with csv files.

I used the code that is already available on stackoverflow.com but it didn't work well with my requirements.

function mergeSheets() {

  /* Retrieve the desired folder */
  var myFolder = DriveApp.getFoldersByName("Test 1").next();

  /* Get all spreadsheets that resided on that folder */
  var spreadSheets = myFolder.getFilesByType("MimeType.csv");

  /* Create the new spreadsheet that you store other sheets */  
  var newSpreadSheet = SpreadsheetApp.create("Merged Sheets");

  /* Iterate over the spreadsheets over the folder */
  while(spreadSheets.hasNext()) {

    var sheet = spreadSheets.next();

    /* Open the spreadsheet */
    var spreadSheet = SpreadsheetApp.openById(sheet.getId());

    /* Get all its sheets */
    for(var y in spreadSheet.getSheets()) {

      /* Copy the sheet to the new merged Spread Sheet */
      spreadSheet.getSheets()[y].copyTo(newSpreadSheet); 
    }
  }      
}

It does create a new sheet but without any csv data.

How to merge multiple CSV files into single file which are under , How to merge multiple CSV files into single file which are under different Subfolders of Folder in GDrive.? You are here: Home · Development  Go to Tools, Merging.CSV Files This will open a separate window. Now click on "Add" button and navigate to the folder containing multiple Excel.csv files that you would like to merge. Note: make

The main problems with your solution were:

  1. You create the new merged sheet even if you don't find any CSV to merge.
  2. You were trying to get CSV files with the wrong mimetype string. (invalid "MimeType.csv" vs correct "text/csv". Alternatively, just MimeType.csv without quotes would work too.)
  3. You assumed that opening a csv with Spreadsheets app was possible, when it isn't.

To fix those issues I have:

  1. Added a check before creating the merge file.
  2. Fixed the mimetype string to the correct one.
  3. Switched the SpreadsheetApp.openById(sheet.getId()); with Utilities.parseCsv(sheet.getBlob().getDataAsString(), ","); so we can open a csv file propperly.
  4. Added logic to add the rows one by one.

Here is some code that works in putting multiple csv files into a single spreadsheet, each file on its own sheet.

function mergeSheets() {
  /* Retrieve the desired folder */
  var myFolder = DriveApp.getFoldersByName("Test 1").next();  
  /* Get all spreadsheets that resided on that folder */
  var spreadSheets = myFolder.getFilesByType("text/csv");
  if (spreadSheets.hasNext()) {
    /* Create the new spreadsheet that you store other sheets */
    var newSpreadSheet = SpreadsheetApp.create("Merged Sheets");
    /* Iterate over the spreadsheets over the folder */
    while(spreadSheets.hasNext()) {
      var sheet = spreadSheets.next();
      /* Load the csv data */
      var csvData = Utilities.parseCsv(sheet.getBlob().getDataAsString(), ",");
      /* Copy the sheet to the new merged Spread Sheet */
      var newSheet = newSpreadSheet.insertSheet("import_"+sheet.getName());
      for (var i=0;i<csvData.length;i++) {
        newSheet.appendRow(csvData[i]);
      }
    } 
  }   
}

Hope this helps!

Merge CSV Files in Google Sheets, Merge CSV Files in Google Sheets with Sheetgo. Consolidate CSV into a single Google Sheets file and transfer data between the two spreadsheet formats. How to Merge CSV Files in Windows 7 Using the CMD Tool. Step 1: Browse to the folder containing the CSV files that you would like to merge. Step 2: Hold down the Shift key on your keyboard, right-click the folder containing the CSV files that you wish to merge, then click the Copy as Step 3:

function mergeCSVFiles(folderId,filename) {
  var folder=DriveApp.getFolderById(folderId);
  var files=folder.getFilesByType(MimeType.csv);
  var s='';
  while(files.hasNext()) {
    var file=files.next();
    s+=file.getBlob().getDataAsString();
  }
  var currentFiles=DriveApp.getRootFolder().getFilesByName(filename);
  while(currentFiles.hasNext()) {
    currentFiles.next().setTrashed(true);
  }
  DriveApp.getRootFolder().createFile(filename,s,"text/csv");//The merged file is in your root folder. 
}

importing and combining several files, have imported 3 identically formated CSV files with data for 3 Make sure each CSV file is a separate worksheet in a single Excel file. Save the  #import csv files from folder path =r'data/US/market/merged_data' allFiles = glob.glob(path + "/*.csv") stockstats_data = pd.DataFrame() list_ = [] for file_ in allFiles: df = pd.read_csv(file_,index_col=None,) list_.append(df) stockstats_data = pd.concat(list_) print(file_ + " has been imported.") This code works fine, but it is slow.

How to combine/merge multiple CSV/Excel files for Mac, Full article here: https://serp.co/blog/combine-merge-csv-files-mac/ How to combine/merge Duration: 2:55 Posted: Dec 27, 2019 And I need to merge all these CSV files to one CSV file which I need to give as final output. Do anyone have idea about how I can do this? Number of files can be upto 800 and size of each file can be upto 1 GB. Though, final output file after merging would be around 5-8 GB. Any help is appreciated.

Merge CSV files online into one file, Use this tool to merge multiple csv files into one. This combined file can be imported to Excel etc. In this guide, I'll show you several ways to merge/combine multiple CSV files into a single one by using Python (it'll work as well for text and other files). There will be bonus one liner for Linux and Windows. Finally with few lines of code you will be able to combine hundreds of files with full control of loaded data - you can convert all the CSV files into a Pandas DataFrame and then mark

Combine CSV Files with Windows 10 PowerShell – ETS , Combine all your CSV files that have the same header row into one file using Windows 10 Powershell. Put all the csv files to combine into the  Now you need to use the “copy” function to merge all the CSV files together. In a similar fashion to the “cd” command, type “copy” after the chevron, followed by a space then “combine.csv”. This copies the data from all CSV files in that location into a single file called ‘combine.csv’.

Comments
  • It works the best according to my requirement, as it appends the csv files in single sheet, now i just have to remove first row from every csv sheet as the title in every csv sheet is same and all i need is the user data. Thanks for the help and yes i get the idea of it from your given link.
  • @AghaMusaKhan - glad that this helped :) Kindly consider accepting the answer too - stackoverflow.com/help/accepted-answer
  • found a way to use MimeType.CSV and that worked for my solution. Perhaps take a peek at that to see if there are any anomalies in doing so?
  • Thanks for the help mate, it works the best.
  • @AghaMusaKhan no problem! Remember to approve the answer that was more helpful to you.
  • I had to change the "MimeType.csv" to "text/csv" and then it workes the best. Thanks for the help man.
  • Thanks for catching that