Generate key
The JSON file
When you have a project in https://firebase.google.com, you can generate the key file.
The settings menu is at the top left of the window.
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Click the Settings cog icon
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Click Project settings
The key generator is in the Service Accounts tab.
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Click the Service Accounts tab
At the bottom of the tab is the generate button.
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Click the Generate new private key button
A dialog opens with a security warning.
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Always read security warnings.
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Click the Generate Key button
The file is generated and automatically downloaded. You should see it in your broswers download indicator.