TypeScript to JSON Schema Converter

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Convert TypeScript Interfaces and Types to JSON Schema Effortlessly

Modern APIs increasingly rely on JSON Schema for validation, documentation, and contract testing. If your codebase is written in TypeScript, you already have rich type definitions sitting right there in your source files. The question is: why rewrite them by hand as JSON Schema when a tool can do the conversion automatically? That is exactly what our TypeScript to JSON Schema Converter does - paste your TypeScript types, get standards-compliant JSON Schema output instantly.

The Problem with Manual Schema Authoring

Writing JSON Schema from scratch is tedious and error-prone. A single misplaced required array entry or an incorrect type keyword can cause validators to silently accept bad data or reject good data. When you already maintain TypeScript interfaces that describe your data shapes precisely, duplicating that effort in JSON Schema is wasted time and a guaranteed source of drift between your code and your contracts.

The TypeScript to JSON Schema Converter eliminates that drift. Your TypeScript source becomes the single source of truth, and the JSON Schema output is always in sync because it is derived directly from your type definitions.

What Gets Converted

The converter handles the TypeScript constructs you actually use in practice:

Interfaces with required and optional properties map cleanly to JSON Schema objects with a properties block and a required array. Union types become oneOf or anyOf entries. Enums translate to enum arrays. Array types - whether written as string[] or Array<string> - produce the correct items schema. Nested interfaces are resolved into nested JSON Schema objects, so even deeply structured payloads come through accurately.

Practical Use Cases for TypeScript to JSON Schema Conversion

API documentation is the most common reason developers reach for this tool. OpenAPI specifications embed JSON Schema for request and response bodies, and generating those schemas from your existing TypeScript types saves hours of manual work. Form validation libraries like Ajv consume JSON Schema directly, so converting your types lets you share validation logic between the front end and back end without maintaining two separate rule sets.

Code generation pipelines also benefit. Many teams generate client SDKs or database migration scripts from JSON Schema. Starting from TypeScript types and converting to schema means your pipeline stays anchored to the types your developers already trust and maintain.

Runs Entirely in Your Browser

Your TypeScript source code is parsed and converted client-side. Nothing is uploaded to a server, which matters when you are working with proprietary business logic or internal API contracts that should not leave your machine. The converter processes your input in milliseconds, so there is no waiting for a round-trip to a remote service.

How to Use the Converter

Paste your TypeScript interface, type alias, or enum into the input panel. The tool parses the syntax, resolves references, and renders the equivalent JSON Schema in the output panel. Copy the result or download it as a .json file. If the parser encounters something it cannot handle, it surfaces a clear error message pointing to the problematic line, so you know exactly what to adjust.

Keep Your Types and Schemas in Sync

Stop maintaining two separate definitions of the same data shape. Let the TypeScript to JSON Schema Converter bridge the gap between your codebase and your validation layer. Paste your types above and get production-ready JSON Schema in seconds - no sign-up, no limits, completely free.