Validr

About Validr

Fast, simple, and powerful validation library with declarative validation rules. Optimized for performance when validating data from various sources.

Key Features

• 110x faster validation than jsonschema and cerberus benchmarks
• 2Schema defined with a concise string-based syntax
• 3Supports nested objects, arrays, optional fields, and defaults
• 4Custom validators registered as simple Python functions
• 5Compiled schema objects for zero-overhead repeated validation

How Python Data Engineers Use Validr

Validr is used in high-throughput data pipelines where validation latency matters. Engineers define a schema string once, compile it to a `Validator` object, and call it on every incoming message — its compiled approach keeps validation overhead minimal even when processing millions of records per hour.