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- Add documentation: Backend Architecture, Sequence diagram, Deployment diagram - Add root .gitignore for Java, Node, Docker and IDE artifacts - Scaffold Spring Boot 3.2 backend via Spring Initializr - Verify empty app starts on port 8080
- ShortenedUrl entity with alias as natural PK, fullUrl, createdAt - ShortenedUrlRepository extends JpaRepository<ShortenedUrl, String> - application.yml: H2 file datasource default, Postgres via env vars - Hibernate ddl-auto: update for schema bootstrapping
- UrlShortenerExceptions: AliasNotFoundException, AliasAlreadyTakenException - InvalidUrlException, InvalidAliasException as static inner classes - Keeps service layer free of exception definitions
- URL validation: scheme (http/https), host presence via java.net.URI
- Alias validation: regex [a-zA-Z0-9_-]{1,50}
- Random alias: 7-char base62 via SecureRandom with 10-attempt retry
- shorten(), findByAlias(), listAll(), delete(), buildShortUrl()
- Validation: blank URL, non-http scheme, malformed URL - Alias: invalid chars, exceeds 50 chars, already taken - Happy path: random alias generation, custom alias - findByAlias throws on missing, delete throws on missing - listAll returns all entries, buildShortUrl concatenates correctly
- POST /shorten: 201 with shortUrl, supports optional customAlias
- GET /{alias}: 302 redirect to fullUrl
- DELETE /{alias}: 204 no content
- GET /urls: 200 list of all entries
- Java records for ShortenRequest, ShortenResponse, UrlEntry DTOs
- AliasNotFoundException → 404
- AliasAlreadyTakenException, InvalidUrlException, InvalidAliasException → 400
- MethodArgumentNotValidException → 400 with first field error message
- Generic Exception → 500
- Consistent {"error": "..."} response body via ErrorResponse record
- UrlEntry interface matching OpenAPI response schema - handleResponse<T>: centralised error parsing, throws with API error message - api.shorten(), api.listAll(), api.deleteAlias() - NEXT_PUBLIC_API_URL env var with typeof window SSR guard
- Controlled inputs for fullUrl and customAlias - Client-side empty URL validation before API call - Loading spinner state during API request - Error alert (role=alert) with API error message - Success alert (role=status) with short URL link and copy button - Enter key submits from either input field
- Renders list of all shortened URLs with alias and truncated fullUrl
- Copy button with 2s "✓" feedback per entry
- Delete button with loading state per row
- Returns null when urls list is empty
- aria-label on all action buttons for accessibility
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