Installing and Launching:
Download and install the latest Node.js LTS version for your operating system
Download and unzip the newest version ArcGIS Experience Builder - Developer Edition. You will only need to download the file with the ‘Download’ Type
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Open up a command prompt (Windows) or terminal window (Mac) and ‘cd’ to the directory where Experience Builder - Developer Edition was unzipped and proceed to the server folder
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Type npm ci and hit enter. This action may take a few minutes to complete
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While this is running, open up another command prompt or terminal window and ‘cd’ to the directory where Experience Builder - Developer Edition was unzipped and proceed to the client folder
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Type npm ci and hit enter. This action may take a few minutes to complete
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Once each of those actions are completed, type in npm start in each command prompt or terminal window
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Open up your internet browser and type in https://localhost:3001/. A warning may appear. Click advanced and then continue to localhost (unsafe)
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A prompt will appear asking for your organization's URL and the Client ID (App ID) you previously generated
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You may get an additional prompt - Request for Permission. Click Allow and you should now have successfully launched Experience Builder
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Additional resources: