We Keep Coding

Creating a Folder in NodeJs

I am trying to write a basic JS script in NodeJs. The script will create a folder with the name of the folder to be reponses_timestamp.
I have written the attached script, however, when it runs, i receive an error which says:
Einval: invalid argument.
Any ideas on how to fix this?
Test.js
const fs = require('fs');
const today = new Date();
const date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
const time = today.getHours()+":"+today.getMinutes()+":"+today.getSeconds();
const dateTime = date + '_' + time;
const uniqueIdentifier = dateTime;
// const folderName = './responses' + '_' + uniqueIdentifier;
try {
if (!fs.existsSync('./responses' + '_' + uniqueIdentifier)) {
fs.mkdirSync('./responses' + '_' + uniqueIdentifier)
}
} catch (err) {
console.error(err)
}

Probably - the problem is with the folder name. In Windows folder should not have special characters, like :

As mentioned the issue is due to the usage of the colon : because Windows (also per your screenshot Windows shown as the path) will not allow special characters.
It wasn't mentioned a solution so I wanted to mention for what you're doing this can be achieved easily with moment js using two lines of code and a substitution of the colon for a dash:
const date = new Date()
const uniqueIdentifier = moment(date).format('YYYY-MM-DD-HH-MM')
console.log('uuid', uniqueIdentifier)
// Result: "uuid" "2021-05-13-11-05"
and even a one-liner:
const uniqueIdentifier = moment(new Date()).format('YYYY-MM-DD-HH-MM')
console.log('uuid', uniqueIdentifier)
// Result: "uuid" "2021-05-13-11-05"

Include variable string inside JS function (HTA app)

I am trying to include variable inside cmd /c runas command, I use JS function and it gives me an error that specified file was not found.
I guess I am using the wrong variable calling or something.
Here is my function:
function runasSRVhta(){
var WShell = new ActiveXObject('WScript.Shell');
// var srvDude = document.getElementById("SRVinput").value;
var SRVguy = "someadmin.srv";
WShell.Run('cmd /c runas /u:sa.local\\SRVguy "c:\\windows\\system32\\mshta.exe """\\\\fs\\FIle Share\\SA Support\\ZverTools\\giveMeIPsPLZ.hta""""', 1, true);
}
Instead of running following command as someadmin.srv it runs its variable name, without taking value.
Problem is here - cmd /c runas /u:sa.local\\SRVguy, SRVguy should be variable taken from var SRVguy = "someadmin.srv";
Update
I tried following function as well, it detects variable value, but my HTA gives me another error saying that it can't find the file specified.
function testsrv() {
var shell = new ActiveXObject("WScript.Shell");
var SRVguy = "someadmin.srv";
var SRVguyaftertext = 'c:\\windows\\system32\\mshta.exe """\\\\fs\\FIle Share\\SA Support\\ZverTools\\giveMeIPsPLZ.hta"""';
var satavesrv = 'cmd /c runas /u:sa.local\\';
var theend = "'" + satavesrv + SRVguy + ' "' + SRVguyaftertext + '"' + "'";
document.write(theend);
var path = theend;
shell.run(theend,1,false);
}
Oh, and I used document.write to check output if it is correct, here is the output:
'cmd /c runas /u:sa.local\someadmin.srv "c:\windows\system32\mshta.exe """\\fs\FIle Share\SA Support\ZverTools\giveMeIPsPLZ.hta""""'
Everything seems correct with second function, but HTA pops up an error message saying that it cannot find the file specified...

try using template strings to include the variable in the string like this
WShell.Run(`cmd /c runas /u:sa.local\\${SRVguy} "c:\\windows\\system32\\mshta.exe """\\\\fs\\FIle Share\\SA Support\\ZverTools\\giveMeIPsPLZ.hta""""`, 1, true);
- Update
WShell.Run('cmd /c runas /u:sa.local\\' +SRVguy + ' "c:\\windows\\system32\\mshta.exe """\\\\fs\\FIle Share\\SA Support\\ZverTools\\giveMeIPsPLZ.hta"""', 1, true);

How do I get rid of everything, every string before a specified word in jquery?

I'm trying to do a simple string replace in jquery but it seems to be more than just a simple code.
In mygallery have this image link (note the 2x ../)
var imgName= '../../appscripts/imgs/pic_library/burn.jpg';
In browsegallery I have something like this:
var imgName ='../../../../../appscripts/imgs/pic_library/burn.jpg';
and sometimes depending on where do I get the image source from, it can be like this
var imgName = '../appscripts/imgs/pic_library/burn.jpg';
What I'm trying to do is, to get rid of all of those '../', and to gain the imgName like this:
'appscripts/imgs/pic_library/burn.jpg';
So this way I can get the right directory for my mobile app.
Can anyone help me on how to get rid of all those (without even counting) '../'?
Best Regards!

Using the replace method of a string you can remove all cases of the
../
var imgPath = '../../../../../appscripts/imgs/pic_library/burn.jpg';
var imgName = imgPath.replace(/\.\.\//g, '');
console.log(imgName);

Here is a direct answer to your question that does not tie you to the "/appscripts" in your example:
const imgName= '../../appscripts/imgs/pic_library/burn.jpg';
const img = imgName.split('../')
.filter((val) => val !== '')
.join('');

If the desired end path is always the same - just get the unique part (the actual file name) and add it to a string of the path you require. the following usies lastIndexOf to get the actual file name from the relative path and then builds a string to give the desired path plus the file name.
var fileSource = 'appscripts/imgs/pic_library/burn.jpg';
let lastIndex = fileSource.lastIndexOf('/');
let fileName = fileSource.slice(lastIndex + 1, fileSource.length); // gives burn.jpg
let imageSource = 'appscripts/imgs/pic_library/' + fileName;
console.log(imageSource); // gives appscripts/imgs/pic_library/burn.jpg

Thank you all for helping me out.
I finally solved this using imgName.split('/appscripts/');
Like this:
var replaceImg = image.split('/appscripts/');
var finalImageName = "../../../appscripts/"+replaceImg[1];
Thank you again!

You can create a jQuery plugin, i.e: $(...).imagify()
Use a regex to replace that pattern: .replace(/(\.){1,2}\//g, '')
$.fn.imagify = function() {
var src = this.attr('src') || '';
this.attr('src', src.replace(/(\.){1,2}\//g, ''));
};
$('img').imagify();
$('img').each((_, obj) => console.log($(obj).attr('src')));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img src='../../../../../appscripts/imgs/pic_library/burn.jpg'>
<img src='../appscripts/imgs/pic_library/burn.jpg'>
<img src='./../../appscripts/imgs/pic_library/burn.jpg'>
Resource
How to Create a Basic Plugin

Removing the last character from file stream in node.js (fs module)

Using node.js, I am trying to build an array of objects and write them to a file. To do this, I'm using the built in fs library.
After calling
var file = fs.createWriteStream('arrayOfObjects.json'); and file.write('[') I run several asynchronous functions to eventually append objects like this:
file.write(JSON.stringify(objectToAppend) + ',\n')
I can determine when all of the objects have stopped appending, and this is where I run file.write(']') and file.end(). My problem is that adding the last comma to the end of the last object causes the JSON to be invalid.
It is very difficult to determine where and when the last object is being created due to the asynchronous nature of the script, so I was wondering if there is a way to strip or remove characters from a file-stream. If so, I could do this before adding the last ']' character.
I could do this manually, but I was hoping to pipe this to another application. The only solution I've thought about is using the fs.truncate() function, however this doesn't seem to work for file streams, and neither file.length or file.length() will give me the length of the contents because it is not a string so it's difficult to determine how or where to truncate the file.
For now I have just been adding '{}]' to the end of the array to make it valid JSON, but this empty object may cause some problems later.
Also note: the array of objects I am writing in this stream is VERY large, so I would rather not end the stream and re-open the file.

I'd recommend to prepend the separator instead, so that you dynamically can adjust it after the first call:
file.write('[\n')
var sep = "";
forEach(function(objectToAppen) {
file.write(sep + JSON.stringify(objectToAppend))
if (!sep)
sep = ",\n";
});

Example using JSONStream:
var JSONStream = require('JSONStream');
var fs = require('fs');
var jsonwriter = JSONStream.stringify();
var file = fs.createWriteStream('arrayOfObjects.json');
// Pipe the JSON data to the file.
jsonwriter.pipe(file);
// Write your objects to the JSON stream.
jsonwriter.write({ foo : 'bar#1' });
jsonwriter.write({ foo : 'bar#2' });
jsonwriter.write({ foo : 'bar#3' });
jsonwriter.write({ foo : 'bar#4' });
// When you're done, end it.
jsonwriter.end();

Here's a snippet incorporating robertklep's answer. This converts from a pipe-separated file to json:
var fs = require('fs');
var readline = require('readline');
var JSONStream = require('JSONStream');
// Make sure we got a filename on the command line.
if (process.argv.length < 3) {
console.log('Usage: node ' + process.argv[1] + ' FILENAME');
process.exit(1);
}
var filename = process.argv[2];
var outputFilename = filename + '.json';
console.log("Converting psv to json. Please wait.");
var jsonwriter = JSONStream.stringify();
var outputFile = fs.createWriteStream(outputFilename);
jsonwriter.pipe(outputFile);
var rl = readline.createInterface({
input: fs.createReadStream(filename),
terminal: false
}).on('line', function(line) {
console.log('Line: ' + line);
if(!/ADDRESS_DETAIL_PID/.test(line))
{
var split = line.split('|');
var line_as_json = { "address_detail_pid": split[0], "flat_type": split[1], "flat_number": split[2], "level_type": split[3], "level_number": split[4], "number_first": split[5], "street_name": split[6], "street_type_code": split[7], "locality_name": split[8], "state_abbreviation": split[9], "postcode": split[10], "longitude": split[11], "latitude": split[12] };
jsonwriter.write(line_as_json);
}
}).on('close', () => {
jsonwriter.end();
});;
console.log('psv2json complete.');

The accepted answer is interesting (prepending the separator) but in my case I have found it easier to append the separator and remove the last character of the file, just as suggested in the question.
This is how you remove the last character of a file with Node.js :
import fs from 'fs'
async function removeLastCharacter(filename) {
const stat = await fs.promises.stat(filename)
const fileSize = stat.size
await fs.promises.truncate(filename, fileSize - 1)
}
explanation :
fs.promises.stat gives us some information about the file, we will use its size.
fs.promises.truncate remove from the file what is after a certain position
We use the position fileSize - 1 which is the last character.
Note :
Yes I know that we need to wait until the stream is closed, but this is ok because truncate and stat functions are very fast and doesn't depend on the file size, it doesn't have to read its content.

How do I change file extension with javascript

Does anyone know an easy way to change a file extension in Javascript?
For example, I have a variable with "first.docx" but I need to change it to "first.html".

This will change the string containing the file name;
let file = "first.docx";
file = file.substr(0, file.lastIndexOf(".")) + ".htm";
For situations where there may not be an extension:
let pos = file.lastIndexOf(".");
file = file.substr(0, pos < 0 ? file.length : pos) + ".htm";

In Node.js:
path.join(path.dirname(file), path.basename(file, path.extname(file)) + '.md')
or more readably:
// extension should include the dot, for example '.html'
function changeExtension(file, extension) {
const basename = path.basename(file, path.extname(file))
return path.join(path.dirname(file), basename + extension)
}
Unlike the accepted answer, this works for edge cases such as if the file doesn't have an extension and one of the parent directories has a dot in their name.

I'd use this:
path.format({ ...path.parse('/path/to/file.txt'), base: '', ext: '.md' })
to change "/path/to/file.txt" to "/path/to/file.md".

file = file.replace(/\.[^.]+$/, '.html');

This probably won't get many upvotes but I couldn't resist.
This code will deal with the edge case where a file might not have an extension already (in which case it will add it). It uses the "tilde trick"
function changeExt (fileName, newExt) {
var _tmp
return fileName.substr(0, ~(_tmp = fileName.lastIndexOf('.')) ? _tmp : fileName.length) + '.' + newExt
}
EDITED: thanks #kylemit for a much better gist which uses the same logic, but in a much much neater way:
function changeExt(fileName, newExt) {
var pos = fileName.includes(".") ? fileName.lastIndexOf(".") : fileName.length
var fileRoot = fileName.substr(0, pos)
var output = `${fileRoot}.${newExt}`
return output
}
console.log(changeExt("img.jpeg", "jpg")) // img.jpg
console.log(changeExt("img.name.jpeg", "jpg")) // img.name.jpg
console.log(changeExt("host", "csv")) // host.csv
console.log(changeExt(".graphqlrc", "graphqlconfig")) // .graphqlconfig

path.parse("first.docx").name + ".html"

var file = "first.docx";
file = file.split(".");
file = file[0]+".html";