' + body + '
b<\\/p>/.test(q));\n"
},
{
"id": "list-pagination",
"category": "api",
"manualIds": [
"skill:api-design"
],
"query": "src/listProducts.js exports listProducts(query, store) for GET /products. query holds raw query-string values (strings or undefined); store.all() returns the full array. Implement offset pagination: limit defaults to 20 and must be an integer 1..100, offset defaults to 0 and must be an integer >= 0. Success returns { status: 200, body: { data, meta: { total, limit, offset, hasMore } } }. Invalid values return { status: 400, body: { error: { code: \"VALIDATION_ERROR\", message, details: [{ field, message }] } } } with one details entry per invalid field (\"limit\" or \"offset\"). Do not mutate the store array. Do not add dependencies.",
"files": {
"src/listProducts.js": "'use strict';\n\n// GET /products?limit=&offset=\nfunction listProducts(query, store) {\n const items = store.all();\n const page = items.slice(query.offset, query.offset + query.limit);\n return { status: 200, body: page };\n}\n\nmodule.exports = { listProducts };\n",
"src/store.js": "'use strict';\n\nfunction createStore(items) {\n return { all: () => items };\n}\n\nmodule.exports = { createStore };\n"
},
"check": "'use strict';\nconst assert = require('node:assert/strict');\nconst path = require('node:path');\nconst { listProducts } = require(path.join(process.cwd(), 'src/listProducts.js'));\nconst items = Array.from({ length: 45 }, (_, i) => ({ id: i + 1 }));\nconst copy = JSON.stringify(items);\nconst store = { all: () => items };\nlet r = listProducts({}, store);\nassert.equal(r.status, 200);\nassert.equal(r.body.data.length, 20);\nassert.deepEqual(r.body.meta, { total: 45, limit: 20, offset: 0, hasMore: true });\nr = listProducts({ limit: '10', offset: '40' }, store);\nassert.deepEqual(r.body.data.map(x => x.id), [41, 42, 43, 44, 45]);\nassert.deepEqual(r.body.meta, { total: 45, limit: 10, offset: 40, hasMore: false });\nr = listProducts({ limit: '5', offset: '35' }, store);\nassert.equal(r.body.meta.hasMore, true);\nr = listProducts({ limit: '100', offset: '100' }, store);\nassert.equal(r.status, 200);\nassert.deepEqual(r.body.data, []);\nassert.equal(r.body.meta.hasMore, false);\nfor (const [q, fields] of [[{ limit: '0' }, ['limit']], [{ limit: '101' }, ['limit']], [{ limit: 'abc' }, ['limit']],\n [{ limit: '2.5' }, ['limit']], [{ offset: '-1' }, ['offset']], [{ limit: '-3', offset: 'x' }, ['limit', 'offset']]]) {\n const bad = listProducts(q, store);\n assert.equal(bad.status, 400, JSON.stringify(q));\n assert.equal(bad.body.error.code, 'VALIDATION_ERROR');\n assert.equal(typeof bad.body.error.message, 'string');\n assert.deepEqual(bad.body.error.details.map(d => d.field).sort(), fields);\n assert.ok(bad.body.error.details.every(d => typeof d.message === 'string'));\n}\nassert.equal(JSON.stringify(items), copy);\n"
},
{
"id": "create-user-status-codes",
"category": "api",
"manualIds": [
"skill:api-design"
],
"query": "src/usersRoute.js exports async createUser(req, repo) for POST /users and async getUser(req, repo) for GET /users/:id. Both return { status, headers?, body }. They currently return 200 for everything and 500 on duplicates. Fix them to use proper REST semantics. createUser: body { email, name }; email must be a string containing \"@\" and name a non-empty trimmed string, otherwise 400 with body { error: { code: \"VALIDATION_ERROR\", message, details: [{ field, message }] } } listing each bad field; if repo.findByEmail(email) returns a user, 409 with error code \"CONFLICT\"; otherwise call repo.create({ email, name }) and return 201 with headers { Location: \"/users/