Extract information from a JSON string and present it on the screen

I am a complete novice when it comes to D3 (with very little experience in JS). Here are the lines of code I am working with:

<script type='text/javascript'> data ='{"mpg":21,"cyl":6,"disp":160,"hp":110,"drat":3.9,"wt":2.62,"qsec":16.46,"vs":0,"am":1,"gear":4,"carb":4,"_row":"Mazda RX4"},{"mpg":21,"cyl":6,"disp":160,"hp":110,"drat":3.9,"wt":2.875,"qsec":17.02,"vs":0,"am":1,"gear":4,"carb":4,"_row":"Mazda RX4 Wag"}';</script>

<script type="text/javascript">
 d3.select("body").append("div").text(JSON.parse(data));
</script>

Every time I run this code, I encounter the following error:

Uncaught SyntaxError: Unexpected token ,     test-html:1

The data itself is generated using R:

<!--begin.rcode results="asis", echo=FALSE, warning=FALSE, message=FALSE
library(RJSONIO)
  out <- paste("<script type='text/javascript'> data ='", gsub("\\[|\\]", "",jsonlite::toJSON(mtcars[1:2,])), "';</script>", sep="")
  cat(out)
end.rcode-->

This results in the JSON string found in the initial code snippet (data).

If anyone can help me identify what the issue might be, I would greatly appreciate it!

Thank you!

Answer №1

the variable 'data' does not contain valid JSON data. Make sure to include [] at the beginning and end of the data.

var data ='[{"mpg":21,"cyl":6,"disp":160,"hp":110,"drat":3.9,"wt":2.62,"qsec":16.46,"vs":0,"am":1,"gear":4,"carb":4,"_row":"Mazda RX4"},{"mpg":21,"cyl":6,"disp":160,"hp":110,"drat":3.9,"wt":2.875,"qsec":17.02,"vs":0,"am":1,"gear":4,"carb":4,"_row":"Mazda RX4 Wag"}]';

In addition, using JSON.parse(data) will result in 2 separate Objects within the variable data, rather than a single string.

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