multiple zip File read and display in angularjs and those files convert base64 in nodejs and push into gitlab. please suggest me if it possible in nodejs. is there any blug available for reference.
use fs module of nodejs to read the files from directory
const testFolder = './tests/';
const fs = require('fs');
fs.readdirSync(testFolder).forEach(file => {
console.log(file);
});
once you get the files you can covert to base64
function base64_encode(file) {
// read binary data
var bitmap = fs.readFileSync(file);
// convert binary data to base64 encoded string
return new Buffer(bitmap).toString('base64');
}
Related
I am working in a project in which i need to create api using nodejs to upload video or image file to the postgres database
How i can do this
Thanks a lot
You can convert an image or video to base64, and then upload the base64 encoded string to your database.
const fs = require('fs');
function encode_base64(file) {
const bitmap = fs.readFileSync(file);
return new Buffer(bitmap).toString('base64');
}
const image = encode_base64('image.jpg');
const video = encode_base64('image.mp4');
I'm getting a ZIP archive from S3 using the aws s3 node SDK.
In this zip file there is a single .json file where I want to get the contents from. I don't want to save this file to storage, but only get the contents of this zip file.
Example:
File.zip contains a single file:
file.json with contents({"value":"abcd"})
I currently have:
const { S3Client, GetObjectCommand} = require("#aws-sdk/client-s3");
const s3Client = new S3Client({ region: 'eu-central-1'});
const file = await s3Client.send(new GetObjectCommand({Bucket:'MyBucket', Key:'file.zip'}));
file.body now contains a Readable stream with the contents of the zip file. I now want to transfer this Readable stream into {"value":"abcd"}
Is there a library or piece of code that can help me do this and produce the result without having to save the file to disk?
You could use the package archiver or zlib (zlib is integrated in nodejs)
a snippet from part of my project looks like this:
import { unzipSync } from 'zlib';
// Fetch data and get buffer
const res = await fetch('url')
const zipBuffer = await res.arrayBuffer()
// Unzip data and convert to utf8
const unzipedBuffer = await unzipSync(zipBuffer)
const fileData = unzipedBuffer.toString('utf8')
Now fileData is the content of your zipped file as a string, you can use JSON.parse(fileData) to get the content as a json and work with it
I'm trying to analyze a file I'll be uploading from react, I need to know if it can be uploaded based on several factors.
I found https://github.com/TooTallNate/node-wav
It works great on nodejs and I'm trying to use it on react. The sample creates a readable stream and pipes it to the wav reader.
var fs = require('fs');
var wav = require('wav');
var file = fs.createReadStream('track01.wav');
var reader = new wav.Reader();
// the "format" event gets emitted at the end of the WAVE header
reader.on('format', function (format) {
//Format of the file
console.log(format);
});
file.pipe(reader);
Using FilePond controller I'm able to get a base64 string of the file. But I can't figure out how to pass it to the reader
this is what I have so far on ReactJS:
var reader = new wav.Reader();
reader.on('format', function (format) {
//Format of file
console.log('format', format);
});
const buffer = new Buffer(base64String, 'base64')
const readable = new Readable()
readable._read = () => { }
readable.push(buffer)
readable.push(null)
readable.pipe(reader)
But I get Error: bad "chunk id": expected "RIFF" or "RIFX", got "u+Zj"
Since this file works on NodeJS with the same lib is obvious I'm doing something wrong.
EDIT:
this was a problem with my Base64 string, this method works if anyone needs to analyze a wav on the frontend
I make an API request which returns a binary image. How can I save it to a file like photo.png on my machine? Doing some research, I've tried the following but when I open the image, my machine says it's damaged:
const buffer = new Buffer(imageBinary);
const b64 = buffer.toString("base64");
const path = `temp/${userId}`;
const url = path + "/photo.png";
if (!fs.existsSync(path)) fs.mkdirSync(path);
if (fs.existsSync(url)) fs.unlinkSync(url)
fs.createWriteStream(url).write(b64);
return url;
Edit: Here is the binary data FYI: https://gist.github.com/AskYous/1fd26dc0eb02b4ec1672dcf5c61a34df
You do not need to re-encode the buffer as base64. Just write the binary buffer as is:
fs.createWriteStream(url).write(imageBinary);
I have to make a POST request to a server that returns me this.
And I have to write a ZIP from that, how do I get the bytes from that string to generate my zip file?
you just need to create a buffer from the api response and create a zip file using that buffer.
var fs = require('fs');
var buff = new Buffer(response_from_api);
fs.writeFile("./test1.zip", buff, function(err){
//do something
});