Servers handle logic, data and APIs.
Servers implement business logic, data access, authentication and APIs using frameworks (Express, Django, Spring, .NET, Rails). Concerns: validation, concurrency, caching, logging, scaling, migrations, background jobs, configuration and observability. Language choice matters less than architecture.
A Django app serves JSON from a PostgreSQL database.
Back-end code holds the business logic, data access and APIs, so it determines correctness, security and performance of the service.
Servers handle logic, data and APIs.
Back-end code holds the business logic, data access and APIs, so it determines correctness, security and performance of the service.
It receives requests, applies rules, reads and writes data, and returns responses to the front end or other services.
Client code can be changed by users, so security checks and sensitive decisions must run on the server.
Typical applications include writing an API that returns sensor readings for a dashboard, validating an order before saving it to the database and scheduling background jobs that process uploaded files.
Study "Front-end frameworks" first (topic 90 of 104 in Software & Computing). It covers the groundwork this topic builds on.
MVC on the server. ORMs. 12-factor app.
A Django app serves JSON from a PostgreSQL database.
The next topic is "Mobile development", which builds directly on this one.
It is classed as Advanced in Software & Computing (topic 91 of 104). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Software & Computing.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.