If you use powershell / invoke-restmethod it will return json and get deserialised into a structured object, too.

    PS C:\> irm ipinfo.io

    PS C:\> $x = irm ipinfo.io
    PS C:\> $x.timezone
    Europe/London

Personally, I use http://checkip.dyndns.org/ by habit, with its one-line return.

No it wont, server need to return JSON format itself.

Your example doesn't work. It needs to be:

    irm ipinfo.io/json

Your other example can be get like this:

    irm http://checkip.dyndns.org | % HTML | % body

It will work. The server will return JSON. The URL http://ipinfo.io/ returns HTML if the Accept header indicates that you want HTML, and JSON if there is no header, a wildcard header, or a header that requests JSON. As far as I can see, irm doesn’t add an Accept header, so the command jodrellblank provided will fetch JSON and work correctly.

Doesnt work on Windows 10 using latest pwsh

Works on Windows 10 using Windows PowerShell. In Pwsh it does seem to need /json

curl ifconfig.co/json