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typescript express tutorial #6. basic data processing with mongodb aggregation. with mongodb aggregation, we can process data and get computed results. thanks to that, we get additional information about the docu*ents in our collections. you can use it to perform some tasks on the data and let the mongodb handle it for you. in this article, we. typescript express tutorial #5. mongodb relationships between docu*ents. today we dive into mongodb relationships between docu*ents. to do it we use mongoose and the populate feature. as always, the code that we cover here is available in the express-typescript repository. you’re welcome to give it a star. mongodb relationships between. typescript express tutorial #4. registering users and authenticating with jwt. today we cover an essential part of almost every application: registering users and authenticating them. to implement it, we use json web tokens (jwt). instead of getting help from libraries like pas*port, we build everything from the ground up to get the best. typescript express tutorial #3. error handling and validating incoming data. since not always everything goes perfectly, you need to expect the unexpected. to prepare for that, we cover typescript express error. typescript express tutorial #2. mongodb, models and environment variables. in this part of the express typescript tutorial, we cover using a mongodb database. to do that properly, we also learn the concept of environment variables. since we follow the mvc pattern, we introduce the idea of a model. just as in the previous part of the tutorial, all hello! in this new series, we build a restful application with typescript express. the course is going to cover the fundamental concepts of the express framework and tools like mongodb. some basic knowledge of typescript would be useful, as we focus on express here.. using recursion to traverse data structures. execution context and the call stack. hello! today we tackle a very interesting topic, which is recursion. the article describes its main principles and dives de*per to uncover