What is the proper format of adding in multiple SSID's into wpa_supplicant.conf?

Question

What is the proper format of adding in multiple SSID's? I have the following below. Do I add a comma like in JSON format?

# For more configuration option please see:
# https://w1.fi/cgit/hostap/plain/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
ap_scan=1

network={
ssid="x"
    # Uncomment to connect to Hidden SSIDs
    #scan_ssid=1 
    key_mgmt=WPA-PSK
    pairwise=CCMP TKIP
    group=CCMP TKIP WEP104 WEP40
    psk="_______"
    priority=2
}

Answer 1

You add multiple network stanzas.

What you have listed is incorrect for the Pi (and most Linux OS) - among other things you omitted Country Code.

See https://raspberrypi.stackexchange.com/a/37921/8697

Answer 2

The proper format to be followed is defined in the manuals for wpa_supplicant, and wpa_supplicant.conf; e.g. man wpa_supplicant. You can also find a good explanatory document for building your own wpa_supplicant.conf file in your local filesystem at: /usr/share/doc/wpa_supplicant/examples/wpa_supplicant.conf

It's not JSON...

In the simplest case, something like this may suffice for small, personal networks:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="WiFiNetworkUpstairs" 
        psk="WiFiPasswordForUpstairs"
}  
network={
        ssid="DownstairsWiFiNetwork"
        psk="WiFiPasswordForDownstairs"  
}
network={
        ssid="AnotherWiFiNetwork"
        psk="AnotherWiFiPassword"
}
# etc, etc, etc