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What is a Javascript manifest file

Lately, I've been hearing quite a lot of talks at my workplace about the Javascript manifests and started to read more about them.

So it turns out that a Javascript manifest is a json file that defines how a Progressive Web App will behave when is installed on a desktop or mobile device. We can see a PWA - Progressive Web App as a hybrid between a webapp and an installed native application. They have access to things like offline storage, location, usb or bluetooth, and so on.

A Javascript manifest file is named manifest.json or .webmanifest and needs to be placed at the root of the website. It has a json format and looks like this:

{ 
    "short_name": "Arrivals", 
    "name": "Arrivals at Sky High", 
    "icons": [ { 
        "src": "launcher-icon.png", 
        "sizes": "48x48", "type": "image/png" }],
    "start_url": "./?utm_source=web_app_manifest", 
    "display": "standalone", 
    "orientation": "portrait", 
    "theme_color": "#29BDBB"
}

Some the things we can define in a manifest file:

  • start_url is required and tells the browser where your application should start when it is launched
  • display the browser UI showed when your app is launched (eq: you can hide the address bar)
  • shortcuts for your app etc

You can read more about it in this article from web.dev - Add a web app manifest.

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10 Javascript AI projects with Langchain & React

Not sure what to build? Dive in with these Javascript AI projects! Learn how to build LLM powered apps using Langchain.js and React! Connect your apps to LLMs such as OpenAI, create agents, use vector databases, or setup AI context.


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