Enumerate the exported variables

This function calls the 'exportFieldNames' function of the REDCap API.

redcap_variables(
  redcap_uri,
  token,
  verbose = TRUE,
  config_options = NULL,
  handle_httr = NULL
)

Arguments

redcap_uri

The uri/url of the REDCap server typically formatted as "https://server.org/apps/redcap/api/". Required.

token

The user-specific string that serves as the password for a project. Required.

verbose

A boolean value indicating if messages should be printed to the R console during the operation. The verbose output might contain sensitive information (e.g. PHI), so turn this off if the output might be visible somewhere public. Optional.

config_options

A list of options passed to httr::POST(). See details at httr::httr_options(). Optional.

handle_httr

The value passed to the handle parameter of httr::POST(). This is useful for only unconventional authentication approaches. It should be NULL for most institutions. Optional.

Value

Currently, a list is returned with the following elements,

• data: A tibble::tibble() where each row represents one column in the REDCap dataset.

• success: A boolean value indicating if the operation was apparently successful.

• status_code: The http status code of the operation.

• outcome_message: A human readable string indicating the operation's outcome.

• elapsed_seconds: The duration of the function.

• raw_text: If an operation is NOT successful, the text returned by REDCap. If an operation is successful, the raw_text is returned as an empty string to save RAM.

Details

As of REDCap version 6.14.2, three variable types are not returned in this call: calculated, file, and descriptive. All variables returned are writable/uploadable.

References

The official documentation can be found on the 'API Help Page' and 'API Examples' pages on the REDCap wiki (i.e., https://community.projectredcap.org/articles/456/api-documentation.html and https://community.projectredcap.org/articles/462/api-examples.html). If you do not have an account for the wiki, please ask your campus REDCap administrator to send you the static material.

Author

Will Beasley

Examples

# \dontrun{
uri         <- "https://bbmc.ouhsc.edu/redcap/api/"
token       <- "9A81268476645C4E5F03428B8AC3AA7B"
ds_variable <- REDCapR::redcap_variables(redcap_uri=uri, token=token)$data
#> 24 variable metadata records were read from REDCap in 0.2 seconds.  The http status code was 200.
# }