Clojure read from a file and add to JSON object

Question

I have a simple text file which contains simple email strings such as:

[email protected]
[email protected]
[email protected]
[email protected]

I want to be able to return the contents of this file as a json response through my REST api which is a simple GET request.

Is there a way I can read the file line by line (I can do that) and append to a JSON object such that I can easily render the contents on a webpage.

{
    "emails": [
        "[email protected]",
        "[email protected]",
        "[email protected]",
        "[email protected]"
    ]
}

I want my REST API to look like:

(GET "/emails" [] {
    "emails": [
        "[email protected]",
        "[email protected]",
        "[email protected]",
        "[email protected]"
    ]
})

but I want to render the JSON upon request as the file can be modified.

Did you define the JSON object itself in your Clojure code? I mean, in terms of Clojure maps/vectors? — D-side
– D-side, Commented Jul 24, 2015 at 15:23

Symfrog · Accepted Answer · 2015-07-24 21:39:36Z

1

You can use the following:

(GET "/emails" []
     (clojure.pprint/cl-format nil
                               "{\"emails\": [~{~S~^,~}]}"
                               (clojure.string/split-lines (slurp "/path/to/addresses.txt"))))

edited Jul 24, 2015 at 21:39

answered Jul 24, 2015 at 15:34

Symfrog

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1 Comment

Chris Edwards Over a year ago

Thats almost what im after however is puts the , inside quotes as well so that the result is: {:emails ["[email protected]" "," "[email protected]" "," ...

Chris Edwards · Accepted Answer · 2015-07-24 15:59:53Z

0

I came up with the following solution using the Chesire library

(GET "/emails" []
    (generate-string {:emails (clojure.string/split-lines (slurp "/path/to/file"))} {:pretty true}))

answered Jul 24, 2015 at 15:59

Chris Edwards

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