WhatsApp messaging Application also comes with the back up option that helps users back up their conversation and restore them at a later date when need arises.
WhatsApp itself creates auto backups on daily routine however you can also decide to do a manual backup by yourself.
On apple iOS Phones, go to Settings > Chat Settings > Chat Backup, then click Backup Now.
On Android mobile phone, simply get into Settings > Chat settings and then click Backup chats to make a backup. It will not backup your media, so you will need to use a file manager to backup the media files in /sdcard/WhatsApp/Media on your mobile.
There is no way to recover chats instantly from WhatsApp, if you would like to recover a backup you are gonna need to uninstall and re-install WhatsApp.
While you begin WhatsApp just after the reinstalling your app, make sure you be persuaded to restore your latest backup. Simply adhere to the method and your chats should really all be back and ready to go.