This is equivalent to vroom_write(), but instead of writing to disk, it returns a string. It is primarily useful for examples and for testing.

vroom_format(x, delim = "\t", na = "NA", col_names = TRUE,
  escape = c("double", "backslash", "none"), quote = c("needed", "all",
  "none"), bom = FALSE)



A data frame to write to disk


One of more characters used to delimiter fields within a record. If NULL the delimiter is guessed from the set of c(",", "\t", " ", "|", ":", ";", "\n").


Character vector of strings to interpret as missing values. Set this option to character() to indicate no missing values.


Either TRUE, FALSE or a character vector of column names.

If TRUE, the first row of the input will be used as the column names, and will not be included in the data frame. If FALSE, column names will be generated automatically: X1, X2, X3 etc.

If col_names is a character vector, the values will be used as the names of the columns, and the first row of the input will be read into the first row of the output data frame.

Missing (NA) column names will generate a warning, and be filled in with dummy names X1, X2 etc. Duplicate column names will generate a warning and be made unique with a numeric prefix.


The type of escape to use when quotes are in the data.

  • double - quotes are escaped by doubling them.

  • backslash - quotes are escaped by a preceding backslash.

  • none - quotes are not escaped.


How to handle fields which contain characters that need to be quoted.

  • needed - Only quote fields which need them.

  • all - Quote all fields.

  • none - Never quote fields.


If TRUE add a UTF-8 BOM at the beginning of the file. This is recommended when saving data for consumption by excel, as it will force excel to read the data with the correct encoding (UTF-8)