The 'ajv' R library
The ajv library is a very thin wrapper around the awesome
AJV JSON validation library. The
essential change between the syntax presented in the official AJV
Readme is exchanging JavaScript's dot
operator (.) with R's dollar-sign operator ($).
Note that care must be taken in transforming R objects to JSON, because of
R's everything-is-a-vector philosopy. Hence, for convenience file paths to
valid JSON (.json) and YAML (.yml or .yaml) may be used wherever an
object is expected.
Installation
# install.packages("devtools") # (if not already installed)
devtools::install_github("jdthorpe/ajvr")Getting started
The fastest validation call:
library('ajv')
ajv = Ajv() # options can be passed, e.g. list(allErrors= TRUE)
validate = ajv$compile(schema)
valid = validate(data)
if (!valid) print(validate$errors)or with less code
# ...
valid = ajv$validate(schema, data)
if (!valid) print(ajv$errors)
# ...or
# ...
ajv$addSchema(schema, 'mySchema')
valid = ajv$validate('mySchema', data)
if (!valid) print(ajv$errorsText())
# ...Note that in each of these calls, schema and data arguments may be a
valid JSON string, an R object (i.e. list(...)), a connection to a JSON
file, or the file name of JSON or YAML file. YAML files are parsed via
js-yaml's safeLoad() method.