FieldTrip

Instantly search, explore, and visualize every field across your schemas.

Point it at a directory. It finds your OpenAPI, AsyncAPI, Protobuf, Avro, and JSON Schema files, indexes every property, and launches a local UI to explore them.

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Why FieldTrip?

Schema sprawl is real. When your system has dozens of services each with their own schema definitions, it becomes impossible to answer simple questions:

• "Which schemas use a customerId field?"
• "Is email required everywhere it appears?"
• "What fields does Order share with Payment?"

FieldTrip answers these in seconds. One command, zero config.

Quick Start

npx @eventcatalog/fieldtrip --dir ./schemas

That's it. FieldTrip scans the directory, indexes every property, and opens a local UI at http://localhost:3200.

Features

Table View — Search & Filter

Full-text search across all property names, types, and descriptions. Filter by schema type, sort by name/schema/type, and click any property to view it in context with syntax highlighting.

• Prefix and fuzzy matching
• Exact match with "quoted strings"
• Filter by schema type (OpenAPI, AsyncAPI, Proto, Avro, JSON)
• Filter by specific schema files via the sidebar
• Click any row to view the full schema with the property highlighted

Matrix View — Property x Schema

See which properties appear in which schemas at a glance. A heatmap-style grid where rows are properties and columns are schemas.

• Green cells = required, Blue cells = optional
• Hover to see type, schema, and required status
• Sort by frequency, alphabetical, or required count
• Instantly spot shared fields across your architecture

Graph View — Force-Directed Relationships

Visualize how schemas are connected through shared properties. Schema nodes cluster with their properties, and shared fields create visible bridges between schemas.

• D3.js force-directed simulation
• Click a property to highlight all schemas sharing that field
• Click a schema to highlight all its properties
• "Shared only" toggle to reduce noise
• Drag, zoom, and pan

Supported Schemas

Format	Extensions	What's indexed
OpenAPI	.yaml .yml .json	Components, definitions, inline request/response bodies
AsyncAPI	.yaml .yml .json	Components, messages, channel payloads (v2 & v3)
Protobuf	.proto	Messages, enums, nested types
Avro	.avsc	Records, nested records, unions, arrays, maps
JSON Schema	.json	Properties, nested objects, allOf/oneOf/anyOf

CLI Options

Usage: fieldtrip [options]

Options:
  --dir <path>     Directory to scan for schema files (required)
  --port <number>  Port for the web UI (default: 3200)
  --no-open        Do not auto-open browser
  -h, --help       Display help

Development

# Install dependencies
npm install

# Run in dev mode
npm run dev

# Build for production
npm run build

How It Works

1. Scan — Recursively finds schema files by extension and content detection
2. Parse — Extracts every property with its name, type, description, path, and required status
3. Index — Builds a MiniSearch full-text index with prefix search and fuzzy matching
4. Serve — Launches an Express server with a Vite-built frontend

License

MIT