R help - May 2018 - help with json data from the web into data frame in R

Hello

I am able to construct a url that points to some data online in the JSON format.
See an example at [0].

I would like to work with this data as a dataframe in R.

I know that there is a package for handling json data [1] but it assumes the
data is in a local file but It is not clear to me how to request the data from
the web in an R script and get the json data converted into a data frame in R.

Can anyone provide a basic example or some guidance please?

-Rich (revansx)

[0]
https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]&format=json
[1] https://www.tutorialspoint.com/r/r_json_files.htm

Hi Rich,
Take a look at the function fromJSON found in the rjson package.
Note that the Usage in the help page: ?fromJSON
names the second argument 'file' but if you look at the description the
argument can be a URL.

HTH,
Eric


On Tue, May 8, 2018 at 6:16 PM, Evans, Richard K. (GRC-H000) <
richard.k.evans at nasa.gov> wrote:
> Hello
>
> I am able to construct a url that points to some data online in the JSON
> format.  See an example at [0].
>
> I would like to work with this data as a dataframe in R.
>
> I know that there is a package for handling json data [1] but it assumes
> the data is in a local file but It is not clear to me how to request the
> data from the web in an R script and get the json data converted into a
> data frame in R.
>
> Can anyone provide a basic example or some guidance please?
>
> -Rich (revansx)
>
> [0] https://www.semantic-mediawiki.org/w/api.php?
> action=ask&query=[[Category:City]]&format=json
> [1] https://www.tutorialspoint.com/r/r_json_files.htm
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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I?ve been tinkering and discovered that the link I need to read json data from
is ?https? and there is a certificate warning that I have to click through from
a browser. That might be my issue. Is there any way in the json package to tell
it to ignore self-signed cert errors in a url?

-Rich

From: Eric Berger [mailto:ericjberger at gmail.com]
Sent: Tuesday, May 08, 2018 11:31 AM
To: Evans, Richard K. (GRC-H000)
Cc: r-help at r-project.org
Subject: Re: [R] help with json data from the web into data frame in R

Hi Rich,
Take a look at the function fromJSON found in the rjson package.
Note that the Usage in the help page: ?fromJSON
names the second argument 'file' but if you look at the description the
argument can be a URL.

HTH,
Eric


On Tue, May 8, 2018 at 6:16 PM, Evans, Richard K. (GRC-H000) <richard.k.evans
at nasa.gov<mailto:richard.k.evans at nasa.gov>> wrote:
Hello

I am able to construct a url that points to some data online in the JSON format.
See an example at [0].

I would like to work with this data as a dataframe in R.

I know that there is a package for handling json data [1] but it assumes the
data is in a local file but It is not clear to me how to request the data from
the web in an R script and get the json data converted into a data frame in R.

Can anyone provide a basic example or some guidance please?

-Rich (revansx)

[0]
https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]&format=json<https://www.semantic-mediawiki.org/w/api.php?action=ask&query=%5b%5bCategory:City%5d%5d&format=json>
[1] https://www.tutorialspoint.com/r/r_json_files.htm

______________________________________________
R-help at r-project.org<mailto:R-help at r-project.org> mailing list -- To
UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.


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