JSON Schema vs Zod vs TypeScript types

Many teams already have Postman collections, HAR files, TypeScript types, Zod schemas, CloudFormation templates, or C4 text. Those sources are useful, but they are often hard to review visually.

This guide focuses on JSON Schema vs Zod vs TypeScript types. The goal is not to replace the source format, but to turn it into a diagram that can be checked, exported, and maintained with documentation.

Start with the smallest useful source instead of pasting a full production file immediately. Small input reveals parsing issues faster and keeps the first diagram readable.

For API debugging, begin with a request collection or HAR fragment. For schema docs, start with one interface or z.object. For architecture docs, begin with a few resources and relationships.

First, check whether node names are short and accurate. Second, verify that arrows match real calls, dependencies, or resource references. Third, look for missing error paths, external systems, databases, and queues.

If the diagram is too large, split it into smaller views: request flow, data structure, deployment topology, monitoring, and alerts can be maintained separately.

The most common mistake is putting too much context into one diagram. A diagram should answer a focused question: who calls whom, which field belongs to which type, or which resource depends on another.

Another mistake is exporting an image without keeping the source. Save both the source text and SVG/PNG so future changes remain reviewable.

Use SVG for READMEs, blogs, and internal docs when possible. Use PNG for chat tools and slide decks. For editable or importable formats, keep the source under docs or architecture directories.

If the input came from AI, treat it as a draft. Preview syntax, relationships, and naming before exporting an image for production documentation.