This is a full walkthrough for the File Metadata Microservice project on freeCodeCamp. We can install an npm package called multer to grab files from file upload inputs. We do this by mounting multer's single() method as a middleware for the POST request on the form. Link to Project : https://www.freecodecamp.org/learn/apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice Written Guide and Source Code : https://www.notion.so/ganeshh123/File-Metadata-Microservice-961a61693f7944808af6bbfa09a32961 Timestamps: 0:00 - Project Setup 01:42 - Install and Set Up Multer 03:22 - Set up the File Upload POST route 09:10 - Styling and Final Touches -————————————————————————————————————- Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser. The Node Package Manager (npm) is a command-line tool used by developers to share and control modules (or packages) of JavaScript code written for use with Node.js. Express.js, or simply Express, is a web application framework for Node.js. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. Express runs between the server created by Node.js and the frontend pages of a web application. Express also handles an application's routing. MongoDB is a cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL). Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB. freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs. Upon completion of all project tasks, students are partnered with other nonprofits to build web applications, giving the students practical development experience. Thanks for Watching! ... https://www.youtube.com/watch?v=rqV7lRPPSL4

To be able to log in users using a username and password, we have to set up a 'strategy' so that we can use these details to authenticate and obtain the user's information. Link to Challenge : https://www.freecodecamp.org/learn/quality-assurance/advanced-node-and-express/authentication-strategies Written Guide: https://www.notion.so/ganeshh123/Authentication-Strategies-85cf3fac514f478d802b76da23858dbe Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1RL9djhgSH65pZhJ6xSyKX8 All Writen Guides for this course : https://www.notion.so/ganeshh123/ccf6039186334f83a54c1c9216f30e3c All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26 00:00 - Introduction 00:18 - Installing passport-local 01:18 - Creating a Local Strategy 02:02 - Getting the User's Document from the Database - db.collection.findOne() Returns one document that satisfies the specified query criteria on the collection or view. If multiple documents satisfy the query, this method returns the first document according to the natural order which reflects the order of documents on the disk. https://docs.mongodb.com/manual/reference/method/db.collection.findOne/ 06:02 - Making Passport Use the Strategy - passport.use() Configure a strategy. Strategies have a "default name" assigned to them, so you don't have to give them a name. https://github.com/jwalton/passport-api-docs#passportusestrategyname-strategy 07:00 - Challenge Solution -————————————————————————————————————- Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser. Express.js, or simply Express, is a web application framework for Node.js. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. Express runs between the server created by Node.js and the frontend pages of a web application. Express also handles an application's routing. freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs. Upon completion of all project tasks, students are p ... https://www.youtube.com/watch?v=fA36I8CYFf0

Since hashing is so computationally expensive, we should use async methods with callback functions to not block connections while they are taking place. bcrypt methods are async by default, and we can provide a callback function to continue after completion. Link to Challenge : https://www.freecodecamp.org/learn/information-security/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously Written Guide: https://www.notion.so/ganeshh123/Hash-and-Compare-Passwords-Asynchronously-2389ec5d63bb47a5af1f277232ffd4fc Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1TeEsQOdf1JmV8PnkQfEpQ4 All Writen Guides for this course : https://www.notion.so/ganeshh123/8ba82d9d1ff84c4583d6e9418ebe426b All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26 00:00 - Introduction 00:16 - Why we should hash asynchronously 00:37 - Hashing Asynchronously - bcrypt.hash() Generates a hash for the given input with the number of rounds, or salt specified. Runs asynchronously, and the callback function provided is executed after with the result. https://www.npmjs.com/package/bcrypt#to-hash-a-password 03:10 - Check a password Asynchronously - bcrypt.compare() Checks that the given hash (second argument) is valid for the given input (first argument). The number of salt rounds can be obtained from the hash. Runs asynchronously, and the callback function provided is executed after with the result. https://www.npmjs.com/package/bcrypt#to-check-a-password 05:35 - Challenge Solution -————————————————————————————————————- HelmetJS is a type of middleware for Express-based applications that automatically sets HTTP headers to prevent sensitive information from unintentionally being passed between the server and client. While HelmetJS does not account for all situations, it does include support for common ones like Content Security Policy, XSS Filtering, and HTTP Strict Transport Security, among others. HelmetJS can be installed on an Express project from npm, after which each layer of protection can be configured to best fit the project. freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs. Upon completion of all project tasks, students are partnered with other nonprofits to build web applications, giving the students pr ... https://www.youtube.com/watch?v=vNfXPf-Ey8U

A Pythagorean triplet is a set of three natural numbers, a less than b less than c, for which, a^2 + b^2 = c^2. There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product abc such that a + b + c = n. Link to Challenge : https://www.freecodecamp.org/learn/coding-interview-prep/project-euler/problem-9-special-pythagorean-triplet Written Guide and Source Code : https://www.notion.so/ganeshh123/Special-Pythagorean-triplet-b1df186a5c6a4e7f8e9def5a74085f82 Full Playlist: https://www.youtube.com/playlist?list=PLhGp6N0DI_1RQjG0wIOi2afjuh9iIeHU6 Project Euler Written Guides : https://www.notion.so/ganeshh123/62598b647b6040f88843b33b46faa309 All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26 00:00 - Introduction 02:06 - Working 10:55 - Solution -————————————————————————————————————- Project Euler (named after Leonhard Euler) is a website dedicated to a series of computational problems intended to be solved with computer programs. The project attracts adults and students interested in mathematics and computer programming. Since its creation in 2001 by Colin Hughes, Project Euler has gained notability and popularity worldwide. It includes over 700 problems, with a new one added once every one or two weeks. Problems are of varying difficulty, but each is solvable in less than a minute of CPU time using an efficient algorithm on a modestly powered computer. As of 5 April 2020, Project Euler has more than 1,000,000 users, from all over the world, who have solved at least one problem. NOTE: I am not a teacher by any means, these videos are just to help me improve my understanding. Thanks for Watching! ... https://www.youtube.com/watch?v=dZJ0coRKxEI