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Theajv library is a very thin wrapper around the awesomeAJV JSON validation library. Theessential change between the syntax presented in the officialAJVReadme is exchanging JavaScript's dotoperator (.) with R's dollar-sign operator ($).

Note that care must be taken in transforming R objects to JSON, because ofR's everything-is-a-vector philosopy. Hence, for convenience file paths tovalid JSON (.json) and YAML (.yml or.yaml) may be used wherever anobject is expected.

# install.packages("devtools") # (if not already installed)devtools::install_github("jdthorpe/ajvr")

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 anddata arguments may be avalid JSON string, an R object (i.e.list(...)), a connection to a JSONfile, or the file name of JSON or YAML file. YAML files are parsed viajs-yaml'ssafeLoad() method.

SeeAPI andOptions for more details.