---
id: voluptuous-serialize
version: "2.7.0"
license: Apache-2.0
license_treatment: permissive
maintenance: active
---

# voluptuous-serialize — Convert voluptuous schemas to dictionaries

License: permissive · Maintenance: active · Downloads: 743.6K/mo

## What it is and what it does

Voluptuous-serialize bridges the gap between Python validation schemas and data interchange formats by converting Voluptuous schema definitions into JSON-compatible structures. It takes a Voluptuous Schema object—which defines validation rules like required fields, type coercion, and constraints—and produces an ordered list of field descriptors with type information, constraints, and metadata that can be serialized to JSON or inspected programmatically.

The package is designed for scenarios where you need to expose schema metadata outside of Python: documenting APIs, generating UI forms, or transmitting validation rules to other systems. It handles standard Voluptuous validators (Required, Optional, All, Coerce, Range, Length) and provides a custom serializer hook for extending support to domain-specific validators. The conversion preserves constraint information like minimum/maximum values and string length bounds.

Use it for:

- Generate API documentation from Voluptuous schemas by converting them to JSON for display or OpenAPI generation.
- Build dynamic form generators that read schema metadata to create UI fields with appropriate constraints.
- Export validation rules to frontend applications or microservices that need to understand schema structure.
- Inspect and debug schema definitions by converting them to readable dictionaries for logging or testing.
- Implement schema versioning systems that serialize schemas for storage or transmission between services.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Converts Voluptuous schema objects into JSON-serializable dictionaries and lists, making schema definitions portable and inspectable outside of Python validation contexts.

Yes. Low install friction, active maintenance, no vulnerabilities, and a clear single-purpose design make this a safe dependency. Install it if you need to expose Voluptuous schema metadata as JSON or dictionaries—particularly for API documentation, form generation, or cross-service schema sharing. Skip it if your schemas never leave Python or you don't use Voluptuous.

## Install

pip install voluptuous-serialize
uv add voluptuous-serialize
poetry add voluptuous-serialize

## Installing voluptuous-serialize

Before you install: Low friction: pure Python wheel with a single runtime dependency (voluptuous). Actively maintained with a recent release (2025-08-17) and no known vulnerabilities.

License in practice: Apache-2.0 permissive license allows use in most commercial and open-source projects without significant restrictions.

Quickstart:

pip install voluptuous-serialize

import voluptuous as vol
from voluptuous_serialize import convert

schema = vol.Schema({vol.Required("name"): str})
result = convert(schema)

Requires Python 3.9 or later.

Verify before relying:

- Whether custom serializers can handle all validator types beyond the documented examples.
- Performance characteristics when converting large or deeply nested schemas.

## Package facts

- License: Apache-2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 743.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

voluptuous schema to json, serialize validation schemas, schema introspection, convert validators to dict, schema metadata export, validation schema serialization, voluptuous schema inspection, schema-serialization, voluptuous-ecosystem

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