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WEB-201Intermediate

Web development

JavaScript Interactive Web Applications

Add reliable interaction, validation and offline behaviour to modern browser applications.

Part of these pathways

Beginner to intermediate web developer

Next delivery

2 November 2026 – 11 December 2026

Teaching days: Monday–Thursday
Time: 09:30–12:30
Mode: Hybrid / Remote
Enrolment: Open for enrolment

What you will be able to do

Clear outcomes. Practical evidence.

Use modern JavaScript syntax
Manipulate the DOM safely
Call and validate APIs
Build offline-capable interactions

Course structure

Modules and lessons

JavaScript values, variables and operators

Use modern syntax, types, conversion and expressions safely.

JavaScript values, variables and operators60 min

Decisions, loops and functions

Control program flow and design reusable functions.

Decisions, loops and functions60 min

Arrays, objects and transformations

Model and transform application data with array methods.

Arrays, objects and transformations60 min

DOM, forms and events

Create accessible interactions and validate user input.

DOM, forms and events60 min

State, JSON and localStorage

Persist non-sensitive state and handle serialization failures.

State, JSON and localStorage60 min

Asynchronous JavaScript and APIs

Use promises, async/await, fetch, timeouts and error states.

Asynchronous JavaScript and APIs60 min

Modules and application structure

Separate data, UI and domain logic into testable modules.

Modules and application structure60 min

Testing, debugging and security

Test pure functions and reduce injection, trust and privacy risks.

Testing, debugging and security60 min

Performance and progressive enhancement

Design resilient interfaces for slow networks and basic devices.

Performance and progressive enhancement60 min

Capstone interactive service finder

Deliver a tested local-services application using synthetic data.

Capstone interactive service finder60 min

Access and progression

Know what the course requires.

The required capability matters; the learner does not have to personally own every device.

Who it is for

Aspiring developers, technical learners, career changers and practitioners seeking applied computing skills.

Hardware access

Personal 64-bit computer with 4 GB RAM and 20 GB free, or use the required device and software at a readiness-approved THNF centre.

Software and practical access

Course software is available through the text-first pack, an approved offline installer or a readiness-approved THNF centre.

Possible progression

Junior development, data, web, application-support or technical-project progression appropriate to the completed portfolio.

Progression is not a guarantee of employment or external certification.

Sierra Leone context

Mobile-first, low-data solutions for Sierra Leonean schools, traders, transport, agriculture, NGOs and SMEs using synthetic local names, districts and NLe values.

Skills in context

Career directions and next steps

These are realistic directions that the skills can support—not promises of employment, job titles or external certification.

Junior front-end developer
Web-content assistant
Freelance website builder

Possible progression pathways

Beginner to intermediate web developer