JSON is default. Plain text via ?format=plain or Accept: text/plain.
https://ip.itisuniqueofficial.com/country
https://ip.itisuniqueofficial.com/country?format=plain
https://ip.itisuniqueofficial.com/ip
https://ip.itisuniqueofficial.com/ip?format=plain
https://ip.itisuniqueofficial.com/meta?pretty=1
https://ip.itisuniqueofficial.com/meta?format=plain
https://ip.itisuniqueofficial.com/full?pretty=1
https://ip.itisuniqueofficial.com/full?format=plain
More: /continent, /region, /postalCode, /timezone, /tls, /ua, /colo
/country?format=plain → IN /city?format=plain → Mumbai /asn?format=plain → 45609
/full?format=plain → key=value lines /tls?format=plain → tlsVersion=... and tlsCipher=...
?pretty=1