---
id: mermaid-builder
version: "0.0.3"
license: unclear
license_treatment: permissive
maintenance: dormant
---

# mermaid-builder — MermaidJS markup builder for Python

License: permissive · Maintenance: dormant · Downloads: 437.4K/mo

## What it is and what it does

mermaid-builder is a Python library that constructs MermaidJS diagram markup through object-oriented method chaining rather than manual string writing. It provides classes for Chart, Node, Link, Subgraph, SequenceDiagram, Participant, and Message, allowing you to build flowcharts and sequence diagrams programmatically and output valid MermaidJS syntax for rendering in Markdown, GitHub, or the MermaidJS playground.

The library has no external dependencies and supports Python 3.5+. It is designed to make diagram creation less error-prone and more maintainable when you need to generate diagrams dynamically or from data structures, rather than hand-writing diagram syntax. The project is in early stages (version 0.0.3) and dormant since June 2024, with some planned features still incomplete.

Use it for:

- Generate flowcharts programmatically from application logic or configuration data.
- Build sequence diagrams dynamically to document API interactions or system flows.
- Create nested subgraphs and complex diagram structures without manual string escaping.
- Embed diagram generation in documentation pipelines or automated reporting tools.

## Worth the install?

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

Programmatically generates MermaidJS diagram markup (flowcharts, sequence diagrams) as Python objects, avoiding manual string concatenation of diagram syntax.

Yes, if you need to generate MermaidJS diagrams programmatically and accept early-stage tooling. No external dependencies and permissive licensing make it low-risk to try. However, dormancy since June 2024 and version 0.0.3 mean incomplete features and potential gaps; verify that flowchart and sequence diagram support covers your use case before committing to it in production.

## Install

pip install mermaid-builder
uv add mermaid-builder
poetry add mermaid-builder

## Installing mermaid-builder

Before you install: Low install friction with no runtime dependencies. Project is dormant since June 2024 with minimal maintenance signal, though the repository remains active and unarchived.

License in practice: MIT license permits commercial and private use with minimal restrictions; suitable for most projects.

Quickstart:

pip install mermaid-builder

from mermaid_builder import Chart, Node, Link

chart = Chart(title='example')
chart.add_node('start').add_node('end').add_link_between('start', 'end')
print(chart)

Requires Python 3.5 or later.

Verify before relying:

- Whether the package handles all MermaidJS diagram types beyond flowcharts and sequence diagrams.
- Current state of the 'clone with prefix' and 'class diagrams' features listed as incomplete in the description.

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: dormant
- Downloads: 437.4K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

mermaid diagram generation python, flowchart builder programmatic, sequence diagram markup builder, mermaidjs syntax generator, diagram as code python, diagram-as-code, mermaidjs

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