datamodel-code-generator 0.54.0
Datamodel Code Generator
Requires Python: >=3.10

# datamodel-code-generator

🚀 Generate Python data models from schema definitions in seconds.

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![license](https://img.shields.io/github/license/koxudaxi/datamodel-code-generator.svg)
[![Pydantic v1](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/pydantic/pydantic/main/docs/badge/v1.json)](https://pydantic.dev)
[![Pydantic v2](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/pydantic/pydantic/main/docs/badge/v2.json)](https://pydantic.dev)

## ✨ What it does

- 📄 Converts **OpenAPI 3**, **JSON Schema**, **GraphQL**, and raw data (JSON/YAML/CSV) into Python models
- 🐍 Generates from **existing Python types** (Pydantic, dataclass, TypedDict) via `--input-model`
- 🎯 Generates **Pydantic v1/v2**, **dataclasses**, **TypedDict**, or **msgspec** output
- 🔗 Handles complex schemas: `$ref`, `allOf`, `oneOf`, `anyOf`, enums, and nested types
- ✅ Produces type-safe, validated code ready for your IDE and type checker

---

## 📖 Documentation

**👉 [datamodel-code-generator.koxudaxi.dev](https://datamodel-code-generator.koxudaxi.dev)**

- 🖥️ [CLI Reference](https://datamodel-code-generator.koxudaxi.dev/cli-reference/) - All command-line options
- ⚙️ [pyproject.toml](https://datamodel-code-generator.koxudaxi.dev/pyproject_toml/) - Configuration file
- 🔄 [CI/CD Integration](https://datamodel-code-generator.koxudaxi.dev/ci-cd/) - GitHub Actions, pre-commit hooks
- 🚀 [One-liner Usage](https://datamodel-code-generator.koxudaxi.dev/oneliner/) - uvx, pipx, clipboard integration
- ❓ [FAQ](https://datamodel-code-generator.koxudaxi.dev/faq/) - Common questions

---

## 📦 Installation

```bash
uv tool install datamodel-code-generator
```

<details>
<summary>Other installation methods</summary>

**pip:**
```bash
pip install datamodel-code-generator
```

**uv (add to project):**
```bash
uv add datamodel-code-generator
```

**conda:**
```bash
conda install -c conda-forge datamodel-code-generator
```

**With HTTP support** (for resolving remote `$ref`):
```bash
pip install 'datamodel-code-generator[http]'
```

**With GraphQL support:**
```bash
pip install 'datamodel-code-generator[graphql]'
```

**Docker:**
```bash
docker pull koxudaxi/datamodel-code-generator
```

</details>

---

## 🏃 Quick Start

```bash
datamodel-codegen --input schema.json --input-file-type jsonschema --output-model-type pydantic_v2.BaseModel --output model.py
```

<details>
<summary>📄 schema.json (input)</summary>

```json
{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Pet",
  "type": "object",
  "required": ["name", "species"],
  "properties": {
    "name": {
      "type": "string",
      "description": "The pet's name"
    },
    "species": {
      "type": "string",
      "enum": ["dog", "cat", "bird", "fish"]
    },
    "age": {
      "type": "integer",
      "minimum": 0,
      "description": "Age in years"
    },
    "vaccinated": {
      "type": "boolean",
      "default": false
    }
  }
}
```

</details>

<details>
<summary>🐍 model.py (output)</summary>

```python
# generated by datamodel-codegen:
#   filename:  schema.json

from __future__ import annotations

from enum import Enum
from typing import Optional

from pydantic import BaseModel, Field


class Species(Enum):
    dog = 'dog'
    cat = 'cat'
    bird = 'bird'
    fish = 'fish'


class Pet(BaseModel):
    name: str = Field(..., description="The pet's name")
    species: Species
    age: Optional[int] = Field(None, description='Age in years', ge=0)
    vaccinated: Optional[bool] = False
```

</details>

---

## 📥 Supported Input

- OpenAPI 3 (YAML/JSON)
- JSON Schema
- JSON / YAML / CSV data
- GraphQL schema
- Python types (Pydantic, dataclass, TypedDict) via `--input-model`
- Python dictionary

## 📤 Supported Output

- [pydantic v1](https://docs.pydantic.dev/1.10/) BaseModel
- [pydantic v2](https://docs.pydantic.dev/) BaseModel
- [pydantic v2](https://docs.pydantic.dev/) dataclass
- [dataclasses](https://docs.python.org/3/library/dataclasses.html)
- [TypedDict](https://docs.python.org/3/library/typing.html#typing.TypedDict)
- [msgspec](https://github.com/jcrist/msgspec) Struct

---

## 🍳 Common Recipes

### 🤖 Get CLI Help from LLMs

Generate a prompt to ask LLMs about CLI options:

```bash
datamodel-codegen --generate-prompt "Best options for Pydantic v2?" | claude -p
```

See [LLM Integration](https://datamodel-code-generator.koxudaxi.dev/llm-integration/) for more examples.

### 🌐 Generate from URL

```bash
pip install 'datamodel-code-generator[http]'
datamodel-codegen --url https://example.com/api/openapi.yaml --output model.py
```

### ⚙️ Use with pyproject.toml

```toml
[tool.datamodel-codegen]
input = "schema.yaml"
output = "src/models.py"
output-model-type = "pydantic_v2.BaseModel"
```

Then simply run:

```bash
datamodel-codegen
```

See [pyproject.toml Configuration](https://datamodel-code-generator.koxudaxi.dev/pyproject_toml/) for more options.

### 🔄 CI/CD Integration

Validate generated models in your CI pipeline:

```yaml
- uses: koxudaxi/datamodel-code-generator@0.44.0
  with:
    input: schemas/api.yaml
    output: src/models/api.py
```

See [CI/CD Integration](https://datamodel-code-generator.koxudaxi.dev/ci-cd/) for more options.

---

## 💖 Sponsors

<table>
  <tr>
    <td valign="top" align="center">
      <a href="https://github.com/astral-sh">
        <img src="https://avatars.githubusercontent.com/u/115962839?s=200&v=4" alt="Astral Logo" style="width: 100px;">
        <p>Astral</p>
      </a>
    </td>
  </tr>
</table>

---

## 🏢 Projects that use datamodel-code-generator

These projects use datamodel-code-generator. See the linked examples for real-world usage.

- [PostHog/posthog](https://github.com/PostHog/posthog) - *[Generate models via npm run](https://github.com/PostHog/posthog/blob/e1a55b9cb38d01225224bebf8f0c1e28faa22399/package.json#L41)*
- [airbytehq/airbyte](https://github.com/airbytehq/airbyte) - *[Generate Python, Java/Kotlin, and Typescript protocol models](https://github.com/airbytehq/airbyte-protocol/tree/main/protocol-models/bin)*
- [apache/iceberg](https://github.com/apache/iceberg) - *[Generate Python code](https://github.com/apache/iceberg/blob/d2e1094ee0cc6239d43f63ba5114272f59d605d2/open-api/README.md?plain=1#L39)*
- [open-metadata/OpenMetadata](https://github.com/open-metadata/OpenMetadata) - *[datamodel_generation.py](https://github.com/open-metadata/OpenMetadata/blob/main/scripts/datamodel_generation.py)*
- [awslabs/aws-lambda-powertools-python](https://github.com/awslabs/aws-lambda-powertools-python) - *[Recommended for advanced-use-cases](https://awslabs.github.io/aws-lambda-powertools-python/2.6.0/utilities/parser/#advanced-use-cases)*
- [Netflix/consoleme](https://github.com/Netflix/consoleme) - *[Generate models from Swagger](https://github.com/Netflix/consoleme/blob/master/docs/gitbook/faq.md#how-do-i-generate-models-from-the-swagger-specification)*
- [DataDog/integrations-core](https://github.com/DataDog/integrations-core) - *[Config models](https://github.com/DataDog/integrations-core/blob/master/docs/developer/meta/config-models.md)*
- [argoproj-labs/hera](https://github.com/argoproj-labs/hera) - *[Makefile](https://github.com/argoproj-labs/hera/blob/c8cbf0c7a676de57469ca3d6aeacde7a5e84f8b7/Makefile#L53-L62)*
- [SeldonIO/MLServer](https://github.com/SeldonIO/MLServer) - *[generate-types.sh](https://github.com/SeldonIO/MLServer/blob/master/hack/generate-types.sh)*
- [geojupyter/jupytergis](https://github.com/geojupyter/jupytergis) - *[Python type generation from JSONSchema](https://jupytergis.readthedocs.io/en/latest/contributor_guide/explanation/code-generation.html)*
- [Nike-Inc/brickflow](https://github.com/Nike-Inc/brickflow) - *[Code generate tools](https://github.com/Nike-Inc/brickflow/blob/e3245bf638588867b831820a6675ada76b2010bf/tools/README.md?plain=1#L8)*
- [cloudcoil/cloudcoil](https://github.com/cloudcoil/cloudcoil) - *[Model generation](https://github.com/cloudcoil/cloudcoil#%EF%B8%8F-model-generation)*
- [IBM/compliance-trestle](https://github.com/IBM/compliance-trestle) - *[Building models from OSCAL schemas](https://github.com/IBM/compliance-trestle/blob/develop/docs/contributing/website.md#building-the-models-from-the-oscal-schemas)*
- [hashintel/hash](https://github.com/hashintel/hash) - *[codegen.sh](https://github.com/hashintel/hash/blob/9762b1a1937e14f6b387677e4c7fe4a5f3d4a1e1/libs/%40local/hash-graph-client/python/scripts/codegen.sh#L21-L39)*

[See all dependents →](https://github.com/koxudaxi/datamodel-code-generator/network/dependents)

---

## 🔗 Related Projects

- **[fastapi-code-generator](https://github.com/koxudaxi/fastapi-code-generator)** - Generate FastAPI app from OpenAPI
- **[pydantic-pycharm-plugin](https://github.com/koxudaxi/pydantic-pycharm-plugin)** - PyCharm plugin for Pydantic

---

## 🤝 Contributing

See [Development & Contributing](https://datamodel-code-generator.koxudaxi.dev/development-contributing/) for how to get started!

## 📄 License

MIT License - see [LICENSE](LICENSE) for details.