diff --git a/backend/deploy/README.md b/backend/deploy/README.md
index 55701c1..9b8eae6 100644
--- a/backend/deploy/README.md
+++ b/backend/deploy/README.md
@@ -3,10 +3,10 @@
 Mal for å kjøre GraphQL-backenden som egen systemd-tjeneste på
 `it2810-36.idi.ntnu.no`. Steg-for-steg på VM: [docs/vm-backend.md §7](../../docs/vm-backend.md#7-graphql-med-systemd-port-3001).
 
-**Verifisert på VM (oktober 2026):** tjenesten kjører som `User=birkjr`,
-`Group=eall_s`, med Node
-`/home/birkjr/.nvm/versions/node/v24.21.0/bin/node`,
-`WorkingDirectory=/home/birkjr/T36-Project-2/backend`, miljø fra
+**Verifisert på VM (oktober 2026):** tjenesten kjører som
+`User=<NTNU_BRUKERNAVN>`, `Group=eall_s` (primærgruppe på IT2810-VM), med Node
+fra nvm (f.eks. `~/.nvm/versions/node/v24.21.0/bin/node`),
+`WorkingDirectory=~/T36-Project-2/backend`, miljø fra
 `/etc/t36-project2/backend.env`. GraphQL svarer på `127.0.0.1:3001/graphql`
 (`health`, `listings`, `createListing`); `systemctl restart` og `enabled` er
 testet. VM-reboot er ikke testet.
@@ -77,15 +77,21 @@ prosessen, men ikke for «alle» på VM:
 
 ```bash
 export DEPLOY_USER="<NTNU_BRUKERNAVN>"
+# Samme gruppe som `Group=` i systemd-enheten (på VM ofte primærgruppen, f.eks. eall_s).
+export DEPLOY_GROUP="$(id -gn "${DEPLOY_USER}")"
 
 sudo mkdir -p /etc/t36-project2
 sudo cp "/home/${DEPLOY_USER}/T36-Project-2/backend/deploy/backend.env.example" \
   /etc/t36-project2/backend.env
 sudo nano /etc/t36-project2/backend.env   # DATABASE_URL, HOST, PORT
 sudo chmod 640 /etc/t36-project2/backend.env
-sudo chown "root:${DEPLOY_USER}" /etc/t36-project2/backend.env
+sudo chown "root:${DEPLOY_GROUP}" /etc/t36-project2/backend.env
 ```
 
+Med `640` kan prosessen lese filen når tjenesten kjører som `User=${DEPLOY_USER}` og
+`Group=${DEPLOY_GROUP}`. Hvis `Group=` i unit-filen avviker fra `DEPLOY_GROUP`, juster
+enten `chown` eller `Group=` slik at de stemmer.
+
 **Krav i filen:** `HOST=127.0.0.1`, `PORT=3001`. GraphQL-implementasjonen må respektere
 disse.
 
diff --git a/backend/src/db/listingsQuery.test.ts b/backend/src/db/listingsQuery.test.ts
index 255bd58..07b1c07 100644
--- a/backend/src/db/listingsQuery.test.ts
+++ b/backend/src/db/listingsQuery.test.ts
@@ -1,3 +1,4 @@
+/** Enhetstester for SQL-bygging i listingsQuery. */
 import { describe, expect, it } from 'vitest';
 
 import type { ListingFilter } from '../validation/listingFilterArgs.js';
diff --git a/backend/src/db/listingsQuery.ts b/backend/src/db/listingsQuery.ts
index b8a357b..4d97ee7 100644
--- a/backend/src/db/listingsQuery.ts
+++ b/backend/src/db/listingsQuery.ts
@@ -1,3 +1,4 @@
+/** Bygger WHERE- og ORDER BY-deler for listings-spørringer (parameterisert SQL). */
 import type {
   ListingFilter,
   ListingSort,
diff --git a/backend/src/db/listingsRepository.ts b/backend/src/db/listingsRepository.ts
index 6b1d8bb..6f24f6e 100644
--- a/backend/src/db/listingsRepository.ts
+++ b/backend/src/db/listingsRepository.ts
@@ -1,3 +1,4 @@
+/** PostgreSQL-tilgang for listings: side, enkelt rad, områder og insert. */
 import { randomUUID } from 'node:crypto';
 
 import type { Listing, ListingRow } from '../types/listing.js';
diff --git a/backend/src/graphql/graphql.api.test.ts b/backend/src/graphql/graphql.api.test.ts
index 6b3a361..1f3b4ff 100644
--- a/backend/src/graphql/graphql.api.test.ts
+++ b/backend/src/graphql/graphql.api.test.ts
@@ -1,3 +1,4 @@
+/** Integrasjonstester for health, listing, createListing og listingAreas. */
 import type { ApolloServer } from '@apollo/server';
 import { describe, it, expect, beforeAll, afterAll, afterEach } from 'vitest';
 
diff --git a/backend/src/graphql/listingsFilter.api.test.ts b/backend/src/graphql/listingsFilter.api.test.ts
index fdc6802..a32908f 100644
--- a/backend/src/graphql/listingsFilter.api.test.ts
+++ b/backend/src/graphql/listingsFilter.api.test.ts
@@ -1,3 +1,4 @@
+/** API-tester for listings med søk, filtre og sortering. */
 import type { ApolloServer } from '@apollo/server';
 import { afterAll, beforeAll, describe, expect, it } from 'vitest';
 
diff --git a/backend/src/graphql/listingsPagination.api.test.ts b/backend/src/graphql/listingsPagination.api.test.ts
index 205763c..4d75af6 100644
--- a/backend/src/graphql/listingsPagination.api.test.ts
+++ b/backend/src/graphql/listingsPagination.api.test.ts
@@ -1,3 +1,4 @@
+/** API-tester for paginerte listings-spørringer. */
 import type { ApolloServer } from '@apollo/server';
 import { afterAll, beforeAll, describe, expect, it } from 'vitest';
 
diff --git a/backend/src/graphql/resolvers.ts b/backend/src/graphql/resolvers.ts
index 884c3b5..e41fba6 100644
--- a/backend/src/graphql/resolvers.ts
+++ b/backend/src/graphql/resolvers.ts
@@ -1,3 +1,4 @@
+/** GraphQL resolvere — kobler spørringer og mutasjoner til repository og validering. */
 import { GraphQLError } from 'graphql';
 
 import {
diff --git a/backend/src/graphql/schema.ts b/backend/src/graphql/schema.ts
index 61d22b9..62a8996 100644
--- a/backend/src/graphql/schema.ts
+++ b/backend/src/graphql/schema.ts
@@ -1,3 +1,4 @@
+/** GraphQL typeDefs for annonser, vurderinger, paginering, filtre og mutasjoner. */
 export const typeDefs = `#graphql
   enum ToolCategory {
     powerTools
diff --git a/backend/src/scripts/seed.ts b/backend/src/scripts/seed.ts
index 97c7f5b..f42406b 100644
--- a/backend/src/scripts/seed.ts
+++ b/backend/src/scripts/seed.ts
@@ -1,3 +1,4 @@
+/** Idempotent seed av de ti faste eksempelannonsene i listings. */
 import { pool } from '../db/pool.js';
 import { seedListings } from '../seed/listings.js';
 import { seedReviews } from '../seed/reviews.js';
diff --git a/backend/src/seed/generateListings.test.ts b/backend/src/seed/generateListings.test.ts
index 48b6173..baade89 100644
--- a/backend/src/seed/generateListings.test.ts
+++ b/backend/src/seed/generateListings.test.ts
@@ -1,3 +1,4 @@
+/** Enhetstester for deterministisk generateListings. */
 import { describe, expect, it } from 'vitest';
 
 import {
diff --git a/backend/src/server.ts b/backend/src/server.ts
index 1326def..2e6f8c0 100644
--- a/backend/src/server.ts
+++ b/backend/src/server.ts
@@ -1,3 +1,4 @@
+/** Starter Apollo Server (GraphQL) med HOST/PORT fra miljø. */
 import 'dotenv/config';
 
 import { ApolloServer } from '@apollo/server';
diff --git a/backend/src/test/apolloTestServer.ts b/backend/src/test/apolloTestServer.ts
index a2ee9e4..3818dd9 100644
--- a/backend/src/test/apolloTestServer.ts
+++ b/backend/src/test/apolloTestServer.ts
@@ -1,3 +1,4 @@
+/** Apollo Server-instans for GraphQL API-tester (Vitest). */
 import type { ApolloServer } from '@apollo/server';
 
 export type TestApolloServer = ApolloServer;
diff --git a/backend/src/test/env.ts b/backend/src/test/env.ts
index c0411c9..c0f0800 100644
--- a/backend/src/test/env.ts
+++ b/backend/src/test/env.ts
@@ -1,3 +1,4 @@
+/** Laster test-miljø og sikrer at DATABASE_URL peker på *_test-database. */
 import {
   assertAllowedTestDatabaseUrl,
   isAllowedTestDatabaseName,
diff --git a/backend/src/test/listingExpectations.ts b/backend/src/test/listingExpectations.ts
index 541020d..02ae373 100644
--- a/backend/src/test/listingExpectations.ts
+++ b/backend/src/test/listingExpectations.ts
@@ -1,3 +1,4 @@
+/** Felles Vitest-hjelpere for å asserte listing-felter i API-tester. */
 import { expect } from 'vitest';
 
 const TOOL_CATEGORIES = [
diff --git a/backend/src/test/testDatabaseUrl.test.ts b/backend/src/test/testDatabaseUrl.test.ts
index fbe26fe..7c1f7f5 100644
--- a/backend/src/test/testDatabaseUrl.test.ts
+++ b/backend/src/test/testDatabaseUrl.test.ts
@@ -1,3 +1,4 @@
+/** Enhetstester for testDatabaseUrl-hjelpere. */
 import { describe, it, expect } from 'vitest';
 
 import {
diff --git a/backend/src/validation/createListingInput.ts b/backend/src/validation/createListingInput.ts
index 2ff408c..8c743b9 100644
--- a/backend/src/validation/createListingInput.ts
+++ b/backend/src/validation/createListingInput.ts
@@ -1,3 +1,4 @@
+/** Validerer createListing-input (speiler frontend listingForm-grenser). */
 import { GraphQLError } from 'graphql';
 
 import type { ToolCategory } from '../types/listing.js';
diff --git a/backend/src/validation/listingFilterArgs.test.ts b/backend/src/validation/listingFilterArgs.test.ts
index 62f773e..fc447ab 100644
--- a/backend/src/validation/listingFilterArgs.test.ts
+++ b/backend/src/validation/listingFilterArgs.test.ts
@@ -1,3 +1,4 @@
+/** Enhetstester for listingFilterArgs-validering. */
 import { GraphQLError } from 'graphql';
 import { describe, expect, it } from 'vitest';
 
diff --git a/backend/src/validation/listingFilterArgs.ts b/backend/src/validation/listingFilterArgs.ts
index 721505c..408d673 100644
--- a/backend/src/validation/listingFilterArgs.ts
+++ b/backend/src/validation/listingFilterArgs.ts
@@ -1,3 +1,4 @@
+/** Parser og validerer filter- og sorteringsargumenter for listings. */
 import { GraphQLError } from 'graphql';
 
 import type { ToolCategory, ToolCondition } from '../types/listing.js';
diff --git a/backend/src/validation/paginationArgs.test.ts b/backend/src/validation/paginationArgs.test.ts
index 6d00dfb..7f3f9a0 100644
--- a/backend/src/validation/paginationArgs.test.ts
+++ b/backend/src/validation/paginationArgs.test.ts
@@ -1,3 +1,4 @@
+/** Enhetstester for paginationArgs-validering. */
 import { GraphQLError } from 'graphql';
 import { describe, expect, it } from 'vitest';
 
diff --git a/backend/src/validation/paginationArgs.ts b/backend/src/validation/paginationArgs.ts
index 0726e97..74622b8 100644
--- a/backend/src/validation/paginationArgs.ts
+++ b/backend/src/validation/paginationArgs.ts
@@ -1,3 +1,4 @@
+/** Validerer limit/offset for paginerte listings-spørringer. */
 import { GraphQLError } from 'graphql';
 
 /** Antall annonser per side når klienten ikke ber om noe annet. */
diff --git a/package-lock.json b/package-lock.json
index 3ae5ecb..3b2139b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,6 +22,7 @@
         "@testing-library/jest-dom": "^7.0.1",
         "@testing-library/react": "^16.3.3",
         "@testing-library/user-event": "^14.6.7",
+        "@types/node": "^24.10.1",
         "@types/react": "^19.3.0",
         "@types/react-dom": "^19.3.0",
         "@vitejs/plugin-react": "^6.1.1",
@@ -1300,6 +1301,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "24.19.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.19.2.tgz",
+      "integrity": "sha512-93d49wCWJkCyN87MxLpNN6KXPCwFw7bVUg79mGUV1OS40JGWwVCr8n61DXCSqz7CV6/VfPkb7xec7uP2M+QHWQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": ">=7.24.0 <7.24.7"
+      }
+    },
     "node_modules/@types/react": {
       "version": "19.3.0",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.3.0.tgz",
@@ -3713,6 +3724,13 @@
         "node": ">=22.19.0"
       }
     },
+    "node_modules/undici-types": {
+      "version": "7.24.6",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.24.6.tgz",
+      "integrity": "sha512-WRNW+sJgj5OBN4/0JpHFqtqzhpbnV0GuB+OozA9gCL7a993SmU+1JBZCzLNxYsbMfIeDL+lTsphD5jN5N+n0zg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.3.3.tgz",
diff --git a/package.json b/package.json
index 770d38e..063c9dd 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/react": "^16.3.3",
     "@testing-library/user-event": "^14.6.7",
+    "@types/node": "^24.10.1",
     "@types/react": "^19.3.0",
     "@types/react-dom": "^19.3.0",
     "@vitejs/plugin-react": "^6.1.1",
diff --git a/src/data/mockListings.ts b/src/data/mockListings.ts
index 3f9ae6d..5abf690 100644
--- a/src/data/mockListings.ts
+++ b/src/data/mockListings.ts
@@ -1,15 +1,14 @@
 /**
- * Oppdiktede eksempelannonser for prototypen. Ingen av annonsene er ekte
- * tilbud, og ingen personopplysninger er brukt. Illustrasjonene er laget for
- * prosjektet.
+ * Ti faste eksempelannonser for Vitest, `listingMocks` og designsiden
+ * (`design.html`). Produksjon og appen henter data fra GraphQL. Innholdet
+ * speiler seed i backend og dekker gratis/betalt utlån, varierende titler og
+ * annonser uten bilde.
  *
- * Dataene er valgt for å dekke ulike tilfeller i visningene: gratis og betalt
- * utlån, korte og lange titler, tomt tilbehør og annonser uten bilde.
  * Snittscore og antall vurderinger er de samme som eksempelvurderingene i
  * backend/src/seed/reviews.ts gir, og noen annonser har ingen vurderinger.
  *
- * Datakilden erstattes senere av GraphQL-backenden. Komponenter bør derfor få
- * annonser gjennom props i stedet for å importere denne filen direkte.
+ * Sider og komponenter skal ikke importere denne filen direkte — bruk props
+ * eller mockede GraphQL-svar.
  */
 
 import type { Listing } from '../types/listing.ts';
diff --git a/src/design/DesignPreview.tsx b/src/design/DesignPreview.tsx
index 06a294f..2a8f418 100644
--- a/src/design/DesignPreview.tsx
+++ b/src/design/DesignPreview.tsx
@@ -1,3 +1,4 @@
+/** Designreferanse: komponenter og mock-annonser for design.html. */
 import Button from '../components/Button/Button.tsx';
 import ListingGrid from '../components/ListingGrid/ListingGrid.tsx';
 import PriceTag from '../components/PriceTag/PriceTag.tsx';
diff --git a/src/design/main.tsx b/src/design/main.tsx
index d42065f..6c7f128 100644
--- a/src/design/main.tsx
+++ b/src/design/main.tsx
@@ -1,3 +1,4 @@
+/** Entry for design.html — viser komponenter og mock-annonser, ikke med i build. */
 import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 import { MemoryRouter } from 'react-router';
diff --git a/src/pages/CatalogPage/CatalogPage.tsx b/src/pages/CatalogPage/CatalogPage.tsx
index 45c1829..a5f926b 100644
--- a/src/pages/CatalogPage/CatalogPage.tsx
+++ b/src/pages/CatalogPage/CatalogPage.tsx
@@ -1,3 +1,4 @@
+/** Katalog med server-side søk, filtre, sortering og paginering via GraphQL. */
 import { useQuery } from '@apollo/client/react';
 import { useCallback, useEffect, useRef } from 'react';
 import { Link, useSearchParams } from 'react-router';
diff --git a/src/pages/ListingDetailPage/ListingDetailPage.tsx b/src/pages/ListingDetailPage/ListingDetailPage.tsx
index 30f7083..c41d412 100644
--- a/src/pages/ListingDetailPage/ListingDetailPage.tsx
+++ b/src/pages/ListingDetailPage/ListingDetailPage.tsx
@@ -1,3 +1,4 @@
+/** Detaljvisning for én annonse og leieforespørsel (demo). */
 import { useQuery } from '@apollo/client/react';
 import { Link, useLocation, useParams } from 'react-router';
 import ListingImage from '../../components/ListingImage/ListingImage.tsx';
diff --git a/src/pages/NotFoundPage/NotFoundPage.tsx b/src/pages/NotFoundPage/NotFoundPage.tsx
index 487ce95..256b2b2 100644
--- a/src/pages/NotFoundPage/NotFoundPage.tsx
+++ b/src/pages/NotFoundPage/NotFoundPage.tsx
@@ -1,3 +1,4 @@
+/** Side for ukjente ruter, med lenke tilbake til katalogen. */
 import { Link } from 'react-router';
 import { usePageTitle } from '../../hooks/usePageTitle.ts';
 
diff --git a/src/pages/RentOutPage/RentOutPage.tsx b/src/pages/RentOutPage/RentOutPage.tsx
index 0f6a87c..8f5df02 100644
--- a/src/pages/RentOutPage/RentOutPage.tsx
+++ b/src/pages/RentOutPage/RentOutPage.tsx
@@ -1,7 +1,7 @@
+/** Skjema for å opprette nye annonser via GraphQL createListing. */
 import ListingForm from '../../components/ListingForm/ListingForm.tsx';
 import { usePageTitle } from '../../hooks/usePageTitle.ts';
 
-/** Siden der brukere legger ut egne verktøy for utleie eller gratis utlån. */
 function RentOutPage() {
   usePageTitle('Lei ut verktøy');
 
diff --git a/src/types/listing.ts b/src/types/listing.ts
index b2d74bd..79db748 100644
--- a/src/types/listing.ts
+++ b/src/types/listing.ts
@@ -1,8 +1,8 @@
 /**
  * Felles datatype for en verktøyannonse.
  *
- * Kategori og tilstand er faste engelske nøkler slik at de senere kan bli
- * GraphQL-enums. Norske visningsnavn ligger i utils/listingFormat.ts.
+ * Kategori og tilstand er faste engelske nøkler, i tråd med GraphQL-enums.
+ * Norske visningsnavn ligger i utils/listingFormat.ts.
  */
 
 export type ToolCategory =
diff --git a/tsconfig.node.json b/tsconfig.node.json
index 351775c..39e7f43 100644
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -3,6 +3,7 @@
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
     "target": "ES2023",
     "lib": ["ES2023"],
+    "types": ["node"],
     "module": "ESNext",
     "skipLibCheck": true,