From c45878bd86245bb7d3102f1be907b26cfb09310c Mon Sep 17 00:00:00 2001 From: Adrian Bonpin Date: Mon, 21 Sep 2026 06:52:11 +0000 Subject: [PATCH] Add movie collection API and frontend (#1) --- .gitignore | 28 ++ README.md | 134 +++++++ index.html | 872 ++++++++++++++++++++++++++++++++++++++++++++ package-lock.json | 899 ++++++++++++++++++++++++++++++++++++++++++++++ package.json | 15 + server.js | 204 +++++++++++ 6 files changed, 2152 insertions(+) create mode 100644 .gitignore create mode 100644 README.md create mode 100644 index.html create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 server.js diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..36fabb6 --- /dev/null +++ b/.gitignore @@ -0,0 +1,28 @@ +# dev +.yarn/ +!.yarn/releases +.vscode/* +!.vscode/launch.json +!.vscode/*.code-snippets +.idea/workspace.xml +.idea/usage.statistics.xml +.idea/shelf + +# deps +node_modules/ + +# env +.env +.env.production + +# logs +logs/ +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +pnpm-debug.log* +lerna-debug.log* + +# misc +.DS_Store diff --git a/README.md b/README.md new file mode 100644 index 0000000..74ff7c0 --- /dev/null +++ b/README.md @@ -0,0 +1,134 @@ +# Movie Collection API + +A simple Movie Collection REST API built with **Node.js + Express**, plus a single-page +frontend that talks to it with `fetch()`. + +A **Movie** is one entry in the collection; the collection is `/api/movies`. Movies are +kept in a plain JavaScript array, so **there is no database — records added through the +API disappear when the server restarts.** + +## Running + +```sh +npm install +npm start # node server.js +``` + +Open . + +```sh +npm run dev # node --watch server.js +PORT=4000 npm start +``` + +## Schema + +Each movie has four fields: + +| Field | Type | Notes | +| --- | --- | --- | +| `id` | integer ≥ 1 | **assigned by the server**, never sent by the client | +| `title` | string, 1–120 chars | required, trimmed | +| `genre` | string, 1–60 chars | required, trimmed | +| `year` | integer, 1888–2100 | required; `"2010"` and `2010` are both accepted | + +The three request fields are required. Anything missing or blank comes back as a `400` +with one message per field. + +## Endpoints + +| Method | Path | Result | +| --- | --- | --- | +| `GET` | `/api/movies` | all movies → `200` | +| `GET` | `/api/movies/:id` | one movie → `200`, or `404` if there is no such id | +| `POST` | `/api/movies` | add a movie → `201` with a `Location` header | +| `GET` | `/` | the frontend | + +Errors come back as a message plus the offending fields: + +```json +{ "error": "Title is required.", "fields": { "title": "Title is required.", "year": "Year is required." } } +``` + +## Examples + +```sh +curl http://localhost:3000/api/movies +curl http://localhost:3000/api/movies/2 + +curl -X POST http://localhost:3000/api/movies \ + -H 'content-type: application/json' \ + -d '{"title":"Inception","genre":"science fiction","year":2010}' +``` + +`GET /api/movies` → `200` + +```json +[ + { "id": 1, "title": "Interstellar", "genre": "Science Fiction", "year": 2014 }, + { "id": 2, "title": "Avengers: Endgame", "genre": "Action", "year": 2019 }, + { "id": 3, "title": "Coco", "genre": "Animation", "year": 2017 } +] +``` + +`POST /api/movies` → `201` · `Location: /api/movies/4` + +```json +{ "id": 4, "title": "Inception", "genre": "science fiction", "year": 2010 } +``` + +`POST /api/movies` with `{}` → `400` + +```json +{ + "error": "Title is required.", + "fields": { + "title": "Title is required.", + "genre": "Genre is required.", + "year": "Year is required." + } +} +``` + +`GET /api/movies/abc` → `400` + +```json +{ "error": "ID must be a whole number, like 1." } +``` + +`GET /api/movies/99` → `404` + +```json +{ "error": "No movie with ID 99." } +``` + +## Frontend + +`index.html` is a single file (no build step, no framework) served by the same Express +app. It: + +- displays the movie list in a table, +- has a form for adding a movie (title, genre, year), +- uses `fetch()` for every call to the API, +- refreshes the list after a movie is added. + +Clicking a row fetches that one movie from `GET /api/movies/:id` and shows it in a detail +panel, so all three endpoints are exercised from the UI. + +## Files + +``` +server.js Express app: schemas, in-memory store, routes, error handling +index.html the frontend (styles + fetch logic, no dependencies) +package.json express + zod +``` + +## Project structure notes + +- **Storage** is `const movies = []` in `server.js`, with a `nextId` counter for the + auto-assigned `id`. It is seeded with three movies on startup. +- **Validation** uses [zod](https://zod.dev). One schema per shape (`movieDraftSchema` + for the request body, `movieSchema` for what is stored and returned), and a small + helper turns a failure into the `{ error, fields }` response the frontend renders next + to each input. +- `node_modules/` is git-ignored. diff --git a/index.html b/index.html new file mode 100644 index 0000000..3d41a18 --- /dev/null +++ b/index.html @@ -0,0 +1,872 @@ + + + + + + + Movie Collection · Movie API + + + + + +
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The collection lives at /api/movies. + * - Storage: a plain JavaScript array. There is no database, so anything you add + * disappears when the server restarts. + * - Validation: zod v4 schemas are the single source of truth. They validate the + * request and produce the per-field error messages the frontend renders. + * - Runs on Node (`node server.js`), which is all this assignment needs. + */ +import express from 'express' +import { readFile } from 'node:fs/promises' +import { fileURLToPath } from 'node:url' +import { z } from 'zod' + +const PORT = process.env.PORT || 3000 + +// --------------------------------------------------------------------------- +// Schemas +// --------------------------------------------------------------------------- + +const ID_MESSAGE = 'ID must be a whole number, like 1.' + +/** `:id` path param. Accepts "2", rejects "abc", "0", "-1" and "1.5". */ +const movieIdSchema = z.coerce.number({ error: ID_MESSAGE }).int(ID_MESSAGE).min(1, ID_MESSAGE) + +/** "2010" (from a form or a query string) and 2010 are the same year. */ +const yearSchema = z.preprocess( + (value) => { + if (value === null || value === undefined) return undefined + if (typeof value !== 'string') return value + + const trimmed = value.trim() + if (trimmed === '') return undefined + return /^-?[0-9]+(\.[0-9]+)?$/.test(trimmed) ? Number(trimmed) : value + }, + z + .number({ + error: (issue) => + issue.input === undefined ? 'Year is required.' : 'Year must be a number, like 2010.', + }) + .int('Year must be a whole year, like 2010.') + .min(1888, 'Year must be 1888 or later.') + .max(2100, 'Year must be 2100 or earlier.'), +) + +/** The fields a client sends. All three are required. */ +const movieFields = { + title: z + .string({ error: 'Title is required.' }) + .trim() + .min(1, 'Title is required.') + .max(120, 'Keep the title under 120 characters.'), + genre: z + .string({ error: 'Genre is required.' }) + .trim() + .min(1, 'Genre is required.') + .max(60, 'Keep the genre under 60 characters.'), + year: yearSchema, +} + +/** What a client sends to add a movie. */ +const movieDraftSchema = z.object(movieFields) + +/** What the API stores and returns: the draft, plus the server-assigned id. */ +const movieSchema = z.object({ id: z.number().int().min(1), ...movieFields }) + +/** Every response that returns more than one movie. */ +const movieListSchema = z.array(movieSchema) + +/** Every error the API returns: a message, plus per-field messages when relevant. */ +const errorSchema = z.object({ + error: z.string(), + fields: z.record(z.string(), z.string()).optional(), +}) + +// --------------------------------------------------------------------------- +// Store — in-memory, seeded with the three movies the frontend starts with +// --------------------------------------------------------------------------- + +let nextId = 1 + +/** @type {Array>} */ +const movies = [] + +function seed(title, genre, year) { + movies.push({ id: nextId++, title, genre, year }) +} + +seed('Interstellar', 'Science Fiction', 2014) +seed('Avengers: Endgame', 'Action', 2019) +seed('Coco', 'Animation', 2017) + +const findMovie = (id) => movies.find((movie) => movie.id === id) + +/** The message every "no such movie" response uses. */ +const missingMovie = (id) => ({ error: `No movie with ID ${id}.` }) + +// --------------------------------------------------------------------------- +// Validation helpers +// --------------------------------------------------------------------------- + +/** + * Turns a zod failure into the API's one error shape: a summary message plus a + * `fields` map the frontend can render next to each input. + */ +function validationError(error) { + const fields = {} + + for (const issue of error.issues) { + const key = issue.path[0] + if (typeof key === 'string' && !(key in fields)) fields[key] = issue.message + } + + return { error: error.issues[0]?.message ?? 'Invalid request.', fields } +} + +/** Validates a body/params object; returns either `{ data }` or `{ error }`. */ +function parse(schema, value) { + const result = schema.safeParse(value) + return result.success ? { data: result.data } : { error: validationError(result.error) } +} + +// --------------------------------------------------------------------------- +// The frontend +// --------------------------------------------------------------------------- + +const INDEX_HTML_PATH = fileURLToPath(new URL('./index.html', import.meta.url)) + +// Read per request, so editing index.html shows up without restarting the server. +async function indexResponse(req, res) { + const html = await readFile(INDEX_HTML_PATH, 'utf8') + res.type('html').send(html) +} + +// --------------------------------------------------------------------------- +// App +// --------------------------------------------------------------------------- + +const app = express() +app.disable('x-powered-by') +app.use(express.json()) + +// ---- Read ------------------------------------------------------------------- + +// GET /api/movies -> the whole collection +app.get('/api/movies', (req, res) => { + res.json(movieListSchema.parse(movies)) +}) + +// GET /api/movies/:id -> one movie +app.get('/api/movies/:id', (req, res) => { + const params = parse(z.object({ id: movieIdSchema }), req.params) + if (params.error) return res.status(400).json(params.error) + + const movie = findMovie(params.data.id) + if (!movie) return res.status(404).json(missingMovie(params.data.id)) + + res.json(movieSchema.parse(movie)) +}) + +// ---- Create ----------------------------------------------------------------- + +// POST /api/movies -> add a movie, with the id assigned by the server +app.post('/api/movies', (req, res) => { + const body = parse(movieDraftSchema, req.body) + if (body.error) return res.status(400).json(body.error) + + const movie = { id: nextId++, ...body.data } + movies.push(movie) + + res.status(201).location(`/api/movies/${movie.id}`).json(movieSchema.parse(movie)) +}) + +// ---- Frontend --------------------------------------------------------------- + +app.get('/', indexResponse) +app.get('/index.html', indexResponse) + +// ---- Fallbacks -------------------------------------------------------------- + +app.use('/api', (req, res) => { + res.status(404).json({ error: `No route for ${req.method} ${req.originalUrl}.` }) +}) + +// Anything the API did not answer is a dead link, not a JSON error. +app.use((req, res) => { + res.status(404).type('txt').send('Not found') +}) + +// Malformed JSON and anything unexpected land here. +app.use((error, req, res, next) => { + if (error?.type === 'entity.parse.failed') { + return res.status(400).json({ error: 'Request body must be valid JSON.' }) + } + + console.error('Unhandled error:', error) + res.status(500).json({ error: 'Internal server error.' }) +}) + +app.listen(PORT, () => { + console.log(`Movie API running at http://localhost:${PORT}`) + console.log(`${movies.length} movies in the in-memory collection`) +})