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| Developed by | Guardrails AI |
| Date of development | Feb 15, 2024 |
| Validator type | Format |
| Blog | |
| License | Apache 2 |
| Input/Output | Output |
This validator ensures that a generated output is parseable as valid JSON.
$ guardrails hub install hub://guardrails/valid_json
In this example, we’ll test that a generated value is valid json.
# Import Guard and Validator
from guardrails.hub import ValidJson
from guardrails import Guard
# Setup Guard
guard = Guard().use(ValidJson, on_fail="exception")
guard.validate('{ "value": "a test value" }') # Validator passes
try:
guard.validate(
'{ "value": "a test value", }'
) # Validator fails; note the trailing comma
except Exception as e:
print(e)
Output:
Validation failed for field with errors: Value is not parseable as valid JSON! Reason: Expecting property name enclosed in double quotes: line 1 column 28 (char 27)
__init__(self, on_fail="noop")
Initializes a new instance of the Validator class.
Parameters:
on_fail (str, Callable): The policy to enact when a validator fails. If str, must be one of reask, fix, filter, refrain, noop, exception or fix_reask. Otherwise, must be a function that is called when the validator fails.validate(self, value, metadata={}) -> ValidationResult
Validates the given value using the rules defined in this validator, relying on the metadata provided to customize the validation process. This method is automatically invoked by guard.parse(...), ensuring the validation logic is applied to the input data.
Note:
guard.parse(...) where this method will be called internally for each associated Validator.guard.parse(...), ensure to pass the appropriate metadata dictionary that includes keys and values required by this validator. If guard is associated with multiple validators, combine all necessary metadata into a single dictionary.Parameters:
value (Any): The input value to validate.metadata (dict): A dictionary containing metadata required for validation. No additional metadata keys are needed for this validator.The validator playground is available to authenticated users. Please log in to use it.