Training course · Bolt · JavaScript & TypeScript

Bolt for JavaScript and TypeScript Developers

Full-stack prototypes right in the browser: generate web apps from prompts with Bolt, run them in WebContainers and deploy them.

Duration
1 day (7 hrs)
Format
Online or on-site
Language
German or English
Participants
open dates or exclusive for your team
Certificate
Certificate of attendance

Overview

“Bolt for JavaScript and TypeScript Developers” is designed for roles such as Front-end and full-stack developers working in JavaScript or TypeScript, Teams migrating an existing JavaScript codebase to TypeScript and Library and SDK maintainers in the npm ecosystem and shows step by step how to use Bolt productively, safely and transparently in JavaScript & TypeScript – from the fundamentals to advanced workflows.

Bolt by StackBlitz generates working full-stack applications from prompts and runs them straight away in the browser. WebContainers make this possible: a Node.js runtime runs entirely inside the browser tab, complete with package installation, dev server and terminal. In this one-day course you learn how to build prototypes quickly with React, Vue, Svelte, Next.js, Astro or Node.js backends, how to structure prompts and project instructions, and how to steer the agent precisely rather than letting it rewrite large parts of your app unchecked.

The course combines fast results with sound engineering practice. You read and edit the generated code in the built-in editor, fix errors using the terminal and console, connect databases and authentication, and export projects to GitHub or as an archive. You then publish your application and learn how to keep token consumption, context size and project scope under control. By the end you know exactly which projects Bolt gets to a clickable result fastest, and at what point moving to a local development environment makes sense.

JavaScript and TypeScript now run in the browser, on servers, in build pipelines and on edge platforms. That breadth comes with complex toolchains: bundlers, transpilers, linters, package managers and an npm ecosystem that never stands still. AI coding assistants and agents remove a great deal of that friction. They migrate JavaScript modules to TypeScript incrementally, derive precise types from API responses, fix ESLint findings, write Vitest or Jest tests and explain nested generics in plain language. For the output to fit your project, the tools need clear guardrails: tsconfig strictness, module system, coding guidelines and test commands. This course shows you how to provide that context deliberately and how to scrutinise generated code.

The course is delivered live – either online in a virtual classroom or on-site in our training rooms in Munich, Salzburg, Berlin, Augsburg, Hanover, Bremen, Stuttgart and Kaiserslautern. We can also run it exclusively for your team.

Who is this course for?

  • Front-end and full-stack developers working in JavaScript or TypeScript
  • Teams migrating an existing JavaScript codebase to TypeScript
  • Library and SDK maintainers in the npm ecosystem
  • Tech leads who own tooling, linting and build processes

Typical challenges we address

  • Gradual type erosion through any, type assertions and lax tsconfig settings
  • Complex toolchains mixing bundlers, transpilers, ESM and CommonJS that are hard to debug
  • Huge dependency trees carrying security and maintenance risk
  • Asynchronous code with hard-to-reproduce race conditions and gaps in error handling

What you will be able to do

  • You can explain how WebContainers work and judge which projects run well in Bolt.
  • You generate a full-stack prototype with frontend, backend and database using structured prompts.
  • You debug issues efficiently via terminal, console and precise feedback to the agent.
  • You publish your application and export the code to GitHub for further development.
  • Use AI agents deliberately for TypeScript migrations, typing work and test generation.
  • Feed assistants your tsconfig, lint rules and project conventions so generated code fits your existing stack.
  • Critically assess proposed npm dependencies and generated code for type safety and security.

Course outline

Module 1 Understanding Bolt and WebContainers
  • Architecture: Node.js, npm and dev server running entirely in the browser
  • Supported frameworks and starter templates at a glance
  • Capabilities and limits of the browser runtime, for instance with native binary packages
  • Using editor, preview, terminal and file tree efficiently
Module 2 Prompting and project control
  • Writing a precise first prompt: stack, pages, data model, style
  • Project and system instructions for recurring conventions
  • Discussion mode for planning, build mode for implementing
  • Iterating in small steps, locking files and rolling back versions
Module 3 Full stack: data, auth and APIs
  • Database and authentication via the built-in backend integration or Supabase
  • Building API routes and server-side logic with Node.js
  • Connecting external APIs and managing keys through environment variables
  • Creating mobile prototypes with Expo and testing them on a device
Module 4 Debugging and code quality
  • Feeding terminal and browser console errors back to the agent effectively
  • Reading, understanding and manually correcting generated code
  • Keeping structure, component boundaries and TypeScript types clean
  • Managing token usage and context size as projects grow
Module 5 Deployment and handover
  • Publishing your app in one click and connecting a custom domain
  • Exporting to GitHub and continuing locally in VS Code, Cursor or Claude Code
  • Security review: secrets, access rights, input validation
  • Decision criteria: evolve the prototype or rebuild it properly
Module 6 Practice lab: JavaScript & TypeScript
  • Incremental TypeScript migration
  • Deriving types from APIs and schemas
  • Writing Vitest and Jest tests
  • Fixing ESLint findings and code smells
  • Debugging build and bundler issues
  • Upgrading dependencies
Module 7 Data protection, quality & transfer to daily work
  • The npm ecosystem is a frequent target of supply-chain attacks, so vet every dependency the AI suggests for provenance, maintenance and licence (for example copyleft terms). Keep API keys and tokens out of prompts and clarify contractually whether your source code may be used to train the provider’s models.
  • Ground rules for safe AI use in your team
  • Checking results: facts, sources, tests and the four-eyes principle
  • Personal action plan for the next 30 days
  • Open questions, outlook and resources for further learning

Practical scenarios from your field

Incremental TypeScript migration

The agent converts JavaScript files to TypeScript module by module, infers types from usage, replaces any with precise types and tightens tsconfig strictness in controlled steps until the compiler runs clean.

Deriving types from APIs and schemas

JSON samples, OpenAPI specifications or database schemas are turned into TypeScript interfaces and Zod schemas for runtime validation, so front end and back end share one consistent contract.

Writing Vitest and Jest tests

For utilities, hooks and services, the AI generates unit tests with sensible mocks, fake timers and snapshot strategies, runs them and fixes failing cases on its own.

Fixing ESLint findings and code smells

The assistant works through lint warnings systematically, replaces outdated patterns such as callback chains with async/await and explains for each rule why the change makes sense.

Debugging build and bundler issues

Error output from Vite, webpack or esbuild is analysed, ESM/CommonJS conflicts are resolved and configuration for path aliases, tree shaking or source maps is corrected.

Upgrading dependencies

The AI reads changelogs for major npm package upgrades, adapts code to breaking changes, updates lockfiles and verifies everything through a type check and a full test run.

Possible hands-on projects

Type-safe API client

A small TypeScript package that generates a type-safe fetch client with Zod validation from an OpenAPI specification, ready to publish to npm with tests.

Browser extension

A TypeScript browser extension that analyses page content and copies it to the clipboard in a structured format – including manifest, content script and automated build.

Monorepo health check

A Node script that inspects workspaces in a monorepo, detects duplicate or inconsistent dependency versions and proposes a clean-up plan.

Prerequisites

Basic JavaScript or TypeScript skills and an understanding of common web concepts such as components, APIs and databases. Technically minded business users can follow along well too. Good command of modern JavaScript, a working knowledge of TypeScript and experience with npm, pnpm or yarn and Git.

Technical requirements

A laptop with an up-to-date Chromium-based browser or Firefox, a Bolt account (a paid plan for intensive use) and a free GitHub account.

Data protection & compliance

The npm ecosystem is a frequent target of supply-chain attacks, so vet every dependency the AI suggests for provenance, maintenance and licence (for example copyleft terms). Keep API keys and tokens out of prompts and clarify contractually whether your source code may be used to train the provider’s models.

Suggested dates

All dates are suggestions – your preferred date is always possible.

  • Wed, 25 November 2026 Online Request
  • Tue, 8 December 2026 Salzburg Request
  • Mon, 14 December 2026 Online Request
  • Fri, 15 January 2027 Bremen Request
  • Mon, 25 January 2027 Online Request
  • Mon, 1 February 2027 Augsburg Request

Frequently asked questions

Do I need a local development environment for Bolt?

No. Thanks to WebContainers, package installation, dev server and terminal all run in the browser, so nothing needs to be installed locally. Only when you want to develop a project long term or integrate it into an existing toolchain does exporting to GitHub and working in a local editor pay off. We practise both in the course.

How is Bolt different from Lovable?

Both generate web apps from prompts. Bolt offers more freedom in choosing a framework and exposes code, terminal and file tree very directly, which suits developers who want to stay close to the code. Lovable relies on a fixed React stack with a stronger focus on design iteration and Supabase. The right choice depends on project and team.

Can I build mobile apps with Bolt?

Yes. Through the Expo integration you can generate React Native prototypes and test them on your phone with Expo Go. This works well for simple apps and clickable prototypes. Native device features, app store publishing and complex offline logic usually call for local development, and the course explains where that boundary lies.

How well do AI assistants handle complex TypeScript types?

Current models understand generics, conditional types and mapped types very well and can explain them clearly. For highly complex type constructions, though, the compiler remains the ultimate judge. On the course you learn to have the agent run tsc iteratively, so suggestions are not merely plausible but genuinely type-correct before you accept them.

Is the course suitable for pure front-end developers?

Yes. The focus is the language and its tooling – typing, tests, linting, builds and dependencies – which matter equally on the front end and the back end. If you want to go deeper into React or Node.js specifically, our catalogue includes dedicated course variants for those stacks.

How much does “Bolt for JavaScript and TypeScript Developers” cost?

The course costs a flat €949 plus VAT per participant – whether online or on-site. This includes 1 training day(s) with a live trainer, course materials, a lab environment and a certificate of attendance.

Can I suggest my own date?

Yes. Our suggested dates are just a guide. In the request form you can always describe your preferred date or period in free text – we check availability and confirm within one working day.

Is the course online or on-site?

Both are possible: live online in a virtual classroom or on-site in Munich, Salzburg, Berlin, Augsburg, Hanover, Bremen, Stuttgart or Kaiserslautern. We can also run the course exclusively for your team.

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