prisma-erd-editor

Prisma generator that creates .erd files compatible with ERD Editor.

Installation

npm install --save-dev prisma-erd-editor

Add the generator to schema.prisma:

generator erd {
  provider = "prisma-erd-editor"
  output   = "../schema.erd"
}

Then run:

npx prisma generate

Open the generated schema.erd at erd-editor.io.

Generated data

• Physical table and column names from @@map and @map
• Scalar, enum, native, optional, and list data types
• Defaults, primary keys, unique fields, and foreign keys
• Composite primary keys and foreign keys
• Explicit indexes and composite unique constraints
• One-to-one and one-to-many relationship cardinality
• Enum memos
• Deterministic IDs

When the output file already exists, table, column, enum, index, and relationship IDs are reused where possible. Table positions, sizes, colors, zoom, and scroll state edited in ERD Editor are preserved across subsequent prisma generate runs.

Limitations

Prisma implicit many-to-many relations do not expose physical join-table columns in the DMMF, so they are not emitted. Use an explicit relation model when the join table must appear in the diagram.

Development

npm install
npm run lint
npm test

npm test builds the package and runs a real prisma generate integration test.