---
id: strictyaml
version: "1.7.3"
license: MIT
license_treatment: permissive
maintenance: aging
---

# strictyaml — Strict, typed YAML parser

License: permissive · Maintenance: aging · Popularity: top 1,000 on PyPI

## Install

pip install strictyaml
uv add strictyaml
poetry add strictyaml

## Description

# StrictYAML

StrictYAML is a [type-safe](https://en.wikipedia.org/wiki/Type_safety) YAML parser
that parses and validates a [restricted subset](https://hitchdev.com/strictyaml/features-removed) of the [YAML](https://hitchdev.com/strictyaml/what-is-yaml)
specification.

Priorities:

- Beautiful API
- Refusing to parse [the ugly, hard to read and insecure features of YAML](https://hitchdev.com/strictyaml/features-removed) like [the Norway problem](https://hitchdev.com/strictyaml/why/implicit-typing-removed).
- Strict validation of markup and straightforward type casting.
- Clear, readable exceptions with **code snippets** and **line numbers**.
- Acting as a near-drop in replacement for pyyaml, ruamel.yaml or poyo.
- Ability to read in YAML, make changes and write it out again with comments preserved.
- [Not speed](https://hitchdev.com/strictyaml/why/speed-not-a-priority), currently.


Simple example:

```yaml
# All about the character
name: Ford Prefect
age: 42
possessions:
- Towel

```


```python
from strictyaml import load, Map, Str, Int, Seq, YAMLError

```





Default parse result:


```python
>>> load(yaml_snippet)
YAML({'name': 'Ford Prefect', 'age': '42', 'possessions':...

## AI interpretation — verify before relying

StrictYAML parses and validates a restricted, type-safe subset of YAML, rejecting unsafe features while preserving comments and line numbers for roundtrip editing.

Verdict: StrictYAML is a stable, permissively licensed YAML parser suited for configuration files where safety and schema validation matter more than speed. Aging maintenance (last release 2023-03-10) is acceptable for a mature library, but users should verify it meets their Python version and feature needs before adoption.

[View on SkillFed](https://skillfed.io/packages/strictyaml) · [View on PyPI](https://pypi.org/project/strictyaml/)