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plumber

Plumber allows you to create a web API by merely decorating your existing R source code with roxygen2-like comments. Take a look at an example.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-26T06:02:11.923Z. Cached copy · Source on rplumber.io

# plumber

Plumber allows you to create a web API by merely decorating your
existing R source code with `roxygen2`-like comments. Take a look at an
example.

``` r

# plumber.R

#* Echo back the input
#* @param msg The message to echo
#* @get /echo
function(msg="") {
  list(msg = paste0("The message is: '", msg, "'"))
}

#* Plot a histogram
#* @serializer png
#* @get /plot
function() {
  rand <- rnorm(100)
  hist(rand)
}

#* Return the sum of two numbers
#* @param a The first number to add
#* @param b The second number to add
#* @post /sum
function(a, b) {
  as.numeric(a) + as.numeric(b)
}
```

These comments allow `plumber` to make your R functions available as API
endpoints. You can use either `#*` as the prefix or `#'`, but we
recommend the former since `#'` will collide with `roxygen2`.

``` r

library(plumber)
# 'plumber.R' is the location of the file shown above
pr("plumber.R") %>%
  pr_run(port=8000)
```

You can visit this URL using a browser or a terminal to run your R
function and get the results. For instance `http://localhost:8000/plot`
will show you a histogram, and `http://localhost:8000/echo?msg=hello`
will echo back the ‘hello’ message you provided.

Here we’re using `curl` via a Mac/Linux terminal.

    $ curl "http://localhost:8000/echo"
     {"msg":["The message is: ''"]}
    $ curl "http://localhost:8000/echo?msg=hello"
     {"msg":["The message is: 'hello'"]}

As you might have guessed, the request’s query string parameters are
forwarded to the R function as arguments (as character strings).
…

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