Mermaid is an open-source JavaScript library that generates diagrams and flowcharts from text-based descriptions, facilitating the embedding of diagrams in documentation and web-based platforms.
Why it matters
GitHub
API Available
overview
Mermaid is an open-source JavaScript library tool developed by the Mermaid.js community that enables developers and technical writers to generate diagrams and flowcharts from text-based descriptions. It allows users to create various diagram types, including C4 diagrams, through a simple text syntax, designed for integration into web pages and markdown.
features
Mermaid.js offers a robust set of features for text-based diagram generation, emphasizing ease of use and integration into developer workflows. Its core functionality revolves around transforming simple text syntax into complex visual representations.
use cases
Mermaid is primarily utilized by developers, technical writers, and project managers who require efficient, version-controlled diagramming solutions that integrate seamlessly into their existing documentation and development workflows.
how to use
Mermaid allows users to create diagrams by writing simple text definitions, which are then rendered into visual diagrams. The process typically involves defining the diagram type and its elements using Mermaid's specific syntax.
graph TD for a flowchart, sequenceDiagram for a sequence diagram, or other specific keywords.A-->B for a flowchart, Alice->>Bob: Hello for a sequence diagram).pricing
Mermaid is an open-source JavaScript library, making its core functionality freely available for use. The project is supported by its community and offers an open-source core.
Enjoying this? Get one like it in your inbox each morning.
one email a day · unsubscribe in two clicks · no third-party tracking
Similar Tools
Mermaid distinguishes itself in the diagramming landscape through its text-based approach and native integration capabilities within markdown environments, particularly GitHub and GitLab. This allows for version-controlled diagrams directly alongside code.
It supports a very wide range of diagram types, including UML, network, and architectural diagrams, with extensive customization options.
PlantUML generally requires a separate renderer (like a JAR file or a server) to generate images, whereas Mermaid can render directly in the browser via JavaScript. Its syntax can be more verbose for simple diagrams.
It specializes in drawing abstract graphs and networks specified in the DOT language, excelling at automatic layout algorithms.
Graphviz is primarily focused on graph and network visualization and doesn't natively support as many specific diagram types (like Gantt charts or sequence diagrams) as Mermaid. It typically requires installation of command-line tools.
D2 is a modern declarative diagramming language designed for readability and automatic layout, compiling to various formats like SVG and PNG.
D2 is a newer tool with a different syntax and a focus on modern design principles, which might require learning a new language compared to Mermaid's more established syntax. It requires a separate compiler to render diagrams.
It provides a simple, opinionated syntax for drawing UML-like diagrams directly in the browser with a hand-drawn aesthetic.
Nomnoml has a more limited set of diagram types compared to Mermaid, primarily focusing on class and sequence-like diagrams, and its styling is less customizable.
More on Stork
Other tools in this category, matched by shared tags
One short daily email of tools worth shipping. No drip funnel.
one email a day · unsubscribe in two clicks · no third-party tracking
For builders
AI agents read it. Buyers land on it. It answers in eight languages and over MCP. Your tool can have one like it — live in 24 hours.