Upload Pdf Using Nodejs From Aws to Storage
Uploading files to AWS S3 using Nodejs
AWS S3. A place where y'all tin store files. That's what most of you lot already know about information technology. S3 is one of the older service provided by Amazon, before the days of revolutionary Lambda functions and game changing Alexa Skills.You lot tin can shop nearly any type of files from doctor to pdf, and of size ranging from 0B to 5TB.
According to their official docs, AWS S3 is,
"S3 provides comprehensive security and compliance capabilities that come across even the about stringent regulatory requirements. Information technology gives customers flexibility in the manner they manage data for cost optimization, access control, and compliance. " - AWS Docs
If I try to put information technology in simple terms, AWS S3, is an object based storage system where every file your shop is saved as object not file. There are many big tech-wigs, which uses S3, and Dropbox is one of them. Recently, Dropbox starts saving metadata of their file in their ain service simply they are nevertheless saving chief data in S3. Why? Well, S3 is not that expensive and it's 99.9% available. Plus, you get the change to utilise services like Glacier which can save data and accuse nearly $0.01 per GB.
So far, if I accept gotten your attending, and yous're thinking how to use S3 in my nodejs application. Well, you don't have to expect for long.
AWS has official package which exposes S3 apis for node js apps and makes it as well easy for developers to access S3 from their apps.
Source: https://youtu.be/FLolHgKRTKg
In adjacent few steps, I volition guide you to build a nodejs based app, which can write any file to AWS S3.
ane. Set up node app
A bones node app commonly have 2 file, package.json (for dependencies) and a starter file (like app.js, index.js, server.js).
Y'all can use your Os's file manager or your favourite IDE to create projection only I usually prefer CLI. And so, permit's go into our beat and follow these commands:
mkdir s3-contacts-upload-demo
cd s3-contacts-upload-demo
bear on index.js .gitignore
npm init
If you didn't get any error in higher up commands, you lot will have a binder by the name of s3-contacts-upload-demo, 3 files in it, packet.json, .gitignore andindex.json. You can use this file to add together file in your .gitignore file, so that these won't go committed to github or another version control.
npm init creates a bundle.json, which accept project's details, y'all can just striking enter in your shell for default values if y'all wish.
2. Install dependencies
Let's start by installing the NPM packet:
npm install --salvage aws-sdk
After successful installation of this packet, you tin also check your bundle.json file, it will have aws-sdk listed in "dependencies" field.
This npm package tin be used to access any AWS service from your nodejs app, and here we will use it for S3.
3. Import packages
Once installed, import the parcel in your code:
const fs = require('fs');
const AWS = crave('aws-sdk');
const s3 = new AWS.S3({
accessKeyId: procedure.env.AWS_ACCESS_KEY,
secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY
});
Every bit you can notice, we have also imported fs bundle which will be used to write file data in this app. We are as well using surround variables, to set up AWS access and secret access central, as information technology is a bad practice to put them on version command like Github or SVN.
Now, you take your S3 instance, which can access all the buckets in your AWS business relationship.
iv. Pass bucket information and write business logic
Below is a uncomplicated epitome of how to upload file to S3. Here, Saucepan is name of your bucket and key is name of subfolder. So, if your bucket name is "test-bucket" and you lot want to relieve file in "exam-saucepan/binder/subfolder/file.csv", then value of Key should exist "older/subfolder/file.csv".
Annotation: S3 is object based storage and not file based. And so, even in AWS panel you can see nested folders, behind the scene they never become saved like that. Every object has two fields: Central and Value. Central here is merely name of file and Value is data which is getting stored.
So, if a bucket "bucket1" has key "key1/key2/file.mp3", you tin visualize it similar this:
{
"bucket1": {
"key1/key2/file.mp3": "<mp3-data>"
}
}
Below is elementary snippe to upload a file,using Key and BucketName.
const params = {
Bucket: 'bucket',
Key: 'key',
Torso: stream
};
s3.upload(params, function(err, information) {
panel.log(err, information);
});
v. File to upload to S3
Showtime, create a file, let's say contacts.csv and write some data in it.
Above is some dummy data for you to get started. Now you have a contacts.csv file, allow's read it using fs module and salvage information technology to S3.
S3 upload method returns mistake and data in callback, where data field contains location, bucket and central of uploaded file. For complete API reference, refer their official docs.
Now run this app past following command:
AWS_ACCESS_KEY=<your_access_key>
AWS_SECRET_ACCESS_KEY=<your_secret_key> node index.js
We have passed our AWS keys as surround variables.
If you lot don't go any error in above snippet, your bucket should have the file.
And that'due south it, under 30 lines of code y'all uploaded a file to AWS S3.
Y'all tin observe the full project here.
There are lot many things y'all tin do with this parcel like
-
Listing out buckets and objects
-
Set permissions on bucket
-
Create, get or delete bucket and much more than
I would highly recommend yous to through this doc for APIs, they are very well explained with parameters you tin can laissez passer to each API and response format they return.
I hope yous found this post useful and please do let us know in instance of whatever question or query.
- Node JS
Useful Links
Source: https://www.zeolearn.com/magazine/uploading-files-to-aws-s3-using-nodejs
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