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WEBMANIFEST JSON
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Convert WEBMANIFEST to JSON

Can you convert WEBMANIFEST to JSON?
Verified by Adam B.· reviewed by FE Editorial ·updated Jun 28, 2026
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Is it possible to convert WEBMANIFEST to JSON?
No - not a direct conversion.

The web app manifest is plain JSON with a .webmanifest extension chosen so servers send the correct MIME type. Renaming it to manifest.json changes nothing about the content and most PWAs already use .json. The only real concern is the Content-Type your server sends.

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Also to JSON: BDOB · EXPRESS · REPLIT

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert WEBMANIFEST to JSON?

There is no conversion between webmanifest and .json because the file is JSON internally - the .webmanifest extension only signals the standardized application/manifest+json media type. Many older or simpler PWAs ship the identical file as manifest.json, and browsers accept either as long as the content type is JSON-valid. So the practical answer is rename, not convert.

How to convert WEBMANIFEST to JSON

File rename EASIEST

Rename app.webmanifest to app.json (or manifest.json) and update the href in your <link rel="manifest"> tag to match.

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Open the file to confirm it is valid JSON, then save it with a .json extension. No content changes are needed.

About these formats

.WEBMANIFEST Web Application Manifest

A .webmanifest file is a small JSON text file that tells a browser how to install and display a Progressive Web App, including its name, icons, start URL, and colors. It is linked from a…

Open .WEBMANIFEST details →
.JSON JavaScript Object Notation file

A JSON file is a plain-text data file in JavaScript Object Notation format, used by web APIs, app configurations, and data exports. Any text editor opens it - Notepad on Windows, TextEdit…

Open .JSON details →

Quality & what to watch

  • The bytes are identical - only the extension changes, so nothing is gained beyond a more familiar name.
  • After renaming to .json, some servers send application/json instead of application/manifest+json; both are accepted, but the manifest-specific type is preferred.
  • Remember to update the manifest href in every HTML page, or the browser will 404 the old path.

Frequently asked questions

Is a webmanifest really just JSON?
Yes. The content is standard JSON; the .webmanifest extension only exists so servers apply the right MIME type.
Will renaming to .json break my PWA?
No, as long as you update the href in the manifest link tag and the file is served with a JSON content type.
Why do some sites use manifest.json instead?
It predates the .webmanifest convention and still works; many PWAs never switched.
Which extension should I prefer?
.webmanifest is the recommended standard, but .json is fully valid if served correctly.