Hva er WEBMANIFEST-filformatet?
En .webmanifest-fil er et Web Application Manifest, et JSON-dokument som en nettleser leser for å installere og vise en Progressive Web App (PWA). Den inneholder et enkelt JSON-objekt der medlemmene beskriver appen: name, short_name, icons, start_url, scope, display, background_color og theme_color, blant andre. Når du legger til en PWA på en telefons hjemskjerm eller et skrivebord, avgjør disse verdiene app-ikonet, tittelen og hvordan vinduet åpnes.
Formatet er en W3C-standard, først utkastet i 2013 og støttet i nettlesere fra Chrome 45 i 2015. En side lenker til den i HTML-hodet:
<link rel="manifest" href="/app.webmanifest">Den registrerte medietypen er application/manifest+json. Filendelsen .webmanifest er den som IANA har registrert, selv om mange nettsteder fortsatt kaller filen manifest.json. Begge fungerer så lenge serveren sender en JSON-gyldig innholdstype.
Sikkerhet og trygghet
RISIKO: LOWA .webmanifest file is plain-text JSON with no executable code, so opening it cannot run anything on your machine. The only practical risk is that a manifest can declare protocol_handlers or file_handlers that register a PWA to handle links or file types once the app is installed, which is a browser-mediated permission, not an action of opening the file. Editing an invalid manifest can break PWA installation but poses no security threat.
Formatdetaljer
i et nøtteskall- Firefox WebExtension manifest - Browser extensions use a manifest file, but it is named manifest.json with a .json extension, not .webmanifest.
- Java JAR/app manifests - Unrelated MANIFEST.MF metadata inside Java archives; different format and purpose.
Programmer som åpner WEBMANIFEST-filer
Windows4 apps
Visual Studio Code
Gratis Open the .webmanifest file to view and edit its JSON with syntax highlighting and JSON validation. 
Google Chrome (DevTools)
Gratis Load the PWA and use DevTools > Application > Manifest to parse and preview the manifest and its icons. 
macOS3 apps
Linux3 apps
PWA Manifest Generator (Progressier)
Freemium Create or edit a manifest in the browser and export a ready-to-use .webmanifest file. Tekniske detaljer
dyp spesifikasjon| Encoding | UTF-8 text |
| Byte order | Not applicable (text) |
| Container | JSON object with top-level keys called members |
| Compression | None (may be gzip/brotli compressed in transit by the web server) |
| Typical size | Under 5 KB |
| Structure | A single JSON object whose members describe a web application: name, short_name, description, icons (array of image objects with src, sizes, type), start_url, scope, display, orientation, background_color, theme_color, categories, screenshots, shortcuts, share_target, protocol_handlers, and file_handlers. |
| Integrity | None built in; integrity relies on HTTPS transport and same-origin/CORS fetch rules |
| Platforms | Windows, macOS, Linux, Android, iOS, ChromeOS |
| Notes | Referenced from a page's HTML head via <link rel="manifest" href="app.webmanifest">. The browser reads it to install a Progressive Web App, set the home-screen icon and name, and control the launch display mode. Servers should return it with the application/manifest+json media type, though browsers also accept application/json. When the manifest is on a different origin than the page scope it must be fetched with CORS. |
| Utgitt | 2013 (first W3C Working Draft, December 17, 2013) |
| Siste versjon | W3C Working Draft (ongoing) |
| Åpen standard | Ja · royalty-fri |
| Spesifikasjon | www.w3.org |
WEBMANIFEST-konverteringer
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