A tool to visualise Zod validation errors
I work on code generator that creates TypeScript SDKs from OpenAPI specs and Zod (https://zod.dev/) is a critical building block that I chose to power runtime validation in those SDKs. Depending on the complexity of a Zod schema, the resulting validation error message can contain a wall of JSON text - the serialised issues that were recorded during validation. I wanted to try and create a small tool to help me better visualise and parse these errors. In code and the command line, we do also have the ability to pretty-print the errors but I still wanted a web UI which can let…
In plain words
This tool visualizes Zod validation errors in a web interface, making it easier to read and understand error messages generated during runtime validation. It's designed for developers working with TypeScript SDKs built from OpenAPI specs that use Zod for validation. Instead of parsing walls of JSON error text, users can see formatted, shareable error visualizations in their browser.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I work on code generator that creates TypeScript SDKs from OpenAPI specs and Zod (https://zod.dev/) is a critical building block that I chose to power runtime validation in those SDKs. Depending on the complexity of a Zod schema, the resulting validation error message can contain a wall of JSON text - the serialised issues that were recorded during validation. I wanted to try and create a small tool to help me better visualise and parse these errors. In code and the command line, we do also have the ability to pretty-print the errors but I still wanted a web UI which can let me share URLs for visualised errors. I'm still iterating on it but would love any feedback if you do get to try it out.
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