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Basic resoruces to start creating Safe Apps
Welcome! We are glad on your interest about creating a Safe App. The team is working hard to provide the tools to make it easier for you to build apps that can interact with the Safe.
Once you are here the main resources include:

UI Kit

If you are creating your Safe App from scratch, we provide a reusable react components package to make it easy to build Safe Apps with a near-native look and feel while still allowing to enable developers to use their branding in the Safe Apps.

SDK Packages

This is one of our main pieces for Safe Apps integrations. Either you already have a dapp or you are thinking about creating a new one you will find useful to rely in one of our integrations to easily communicate with the Safe application. In this packages you will find integrations with very common packages like Web3Modal, Blocknative onboard.js or web3-react, that you may be already using on your project. For those creating a new dapp, our CRA template to kickstart the basic structure with all the necessary configuration will speed up the process. Check more about SDK Packages.

Basic requirements

If you already have a dapp these are some mandatory requirements to adapt your app to be used as a Safe App. Without this basic configuration the dapp won't work with the Safe as expected.
If you are using our CRA template to start your Safe App this basic requirements are already included.

Manifest

It is mandatory that your app exposes a manifest.json file in the root dir with this structure:
{
"name": "YourAppName",
"description": "A description of what your app do",
"iconPath": "myAppIcon.svg"
}
Note: iconPath it's the public relative path where the Safe will try to load your app icon. For this example, it should be https://yourAppUrl/myAppIcon.svg.

CORS

At some moments we need to be able to reach the manifest.json from our app. To allow this it is required to enable Cross Site Requests by setting the CORS headers to the manifest.json.
The required headers are:
"Access-Control-Allow-Origin": "\*",
"Access-Control-Allow-Methods": "GET",
"Access-Control-Allow-Headers": "X-Requested-With, content-type, Authorization"

React development

It is possible to use the local React development server. For this you need to set the CORS headers and make sure to use the same protocol (http or https) as the Safe interface you are using for testing.
CORS
For this we recommend to use react-app-rewired. To enable the library update the scripts section in the package.json:
"scripts": {
"start": "react-app-rewired start",
"build": "react-app-rewired build",
"test": "react-app-rewired test"
},
Additionally, you need to create the config-overrides.js file in the root of the project to confirgure the CORS headers. The content of the file should be:
/* config-overrides.js */
module.exports = {
// The function to use to create a webpack dev server configuration when running the development
// server with 'npm run start' or 'yarn start'.
// Example: set the dev server to use a specific certificate in https.
devServer: function (configFunction) {
// Return the replacement function for create-react-app to use to generate the Webpack
// Development Server config. "configFunction" is the function that would normally have
// been used to generate the Webpack Development server config - you can use it to create
// a starting configuration to then modify instead of having to create a config from scratch.
return function (proxy, allowedHost) {
// Create the default config by calling configFunction with the proxy/allowedHost parameters
const config = configFunction(proxy, allowedHost);
config.headers = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET',
'Access-Control-Allow-Headers': 'X-Requested-With, content-type, Authorization',
};
// Return your customised Webpack Development Server config.
return config;
};
},
};
SSL
To enable SSL with react-scripts it is necessary to set the HTTPS environment variable to true. This can be done in the package.json file by adjusting the scripts section to:
"scripts": {
"start": "HTTPS=true react-app-rewired start",
},
As in most cases the SSL certificate provided by react-scripts is not valid it is required to mark it as trusted in your browser. For this open the Safe App in a separate tab (not in the Safe interface) and accept the certificate/ ignore the warning.