validate_json('[]')
df <- data.frame(id = 1:5, val = letters[1:5])
validate_json( to_json(df) )
validate_json('{"x":1,"y":2,"z":"a"}')
validate_json( c('{"x":1,"y":2,"z":"a"}', to_json(df) ) )
validate_json( c('{"x":1,"y":2,"z":a}', to_json(df) ) )
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