This tool provides a way to backup your Facebook inbox.
There is also some additional stats tools available, like getting most used words or drawing messages/day chart.
Make sure you have Node.js installed. https://nodejs.org/
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git clone https://github.com/agentcooper/facebook-inbox-backup.git -
cd facebook-inbox-backup && npm install -
Go to https://developers.facebook.com/apps/ and create a new app. Add new platform (web), set Site URL to "http://localhost:8080" and add "locahost" to App Domains.
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Run
npm start -
Open your browser at http://localhost:8080#appId, where appID is the id of your app