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erd is a Haskell-based command-line tool that transforms a plain-text description of a relational database schema into a graphical entity-relationship diagram using common ER conventions. This utility takes a plain text description of entities, their attributes and the relationships between entities and produces a visual diagram modeling the description. The visualization is produced by using Dot with GraphViz. There are limited options for specifying color and font information. Also, erd can output graphs in a variety of formats, including but not limited to: pdf, svg, eps, png, jpg, plain text and dot. In case one wishes to have a statically linked erd as a result, this is possible to have by executing build-static_by-nix.sh: which requires the nix package manager to be installed on the building machine. NixOS itself is not a requirement.
Features
- Reads simple, human-readable text schema descriptions
- Produces visual ER diagrams depicting entities, relationships, and cardinalities
- Uses GraphViz for rendering output diagrams
- Lightweight and easy to integrate into text-based workflows
- Licensed under public domain (Unlicense)
- Ideal for quick visual documentation of schema designs
Project Samples
