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TypeMorph | TypeScript API Safety Toolkit
jop00004 · 2026-06-18 · via Hacker News: Show HN

Build Faster.
Model Everything.

↑ Edit the JSON above — output updates in real time, 100% in your browser

Stop hand-writing TypeScript types from API responses.
Paste JSON and instantly get Zod schemas, TypeScript interfaces, database schemas — all in your browser.

Security Standard

Local-First

Inference Engine

100% Browser

How it works

One inference. Every language.

TypeMorph runs a single AST pipeline in your browser — no backend, no round-trips. Your schema is inferred once and compiled to all 18 targets simultaneously.

single inference · runs in your browser

TypeScript

Zod

Go

Rust

Python

Java

Kotlin

Swift

C#

Dart

GraphQL

Prisma

Proto

PHP

JSON Schema

Rust struct

Mock JSON

+ Docs

Your schema never leaves your browser — not even the URL you import from (unless you opt in to the proxy)

Four Pillars of Pure Schema Engineering

We cut out the clutter. These four premium workbenches solve 90% of your daily structural bottlenecks.

Paste Once.
Compile Everywhere.

Drop any JSON, YAML, or OpenAPI spec and TypeMorph emits typed code for every language your team uses — simultaneously, in the browser, with no server involved. The Zod output goes beyond types: field names are analysed semantically so email fields get .email(), id fields get .uuid().

  • 18 generators from one AST — TypeScript, Go, Rust, Java, Swift, Kotlin, C#…
  • Semantic field inference: enums, formats, and constraints auto-detected

Schema Intelligence:
Quality Score & Recursive Types

Paste any JSON, OpenAPI, or JSON Schema and TypeMorph scores it instantly — any-type ratio, naming consistency, format hints, depth. Self-referential types like trees and linked lists are detected automatically and emitted as clean recursive interfaces.

  • 100% local rule-based quality scoring (0–100 / A–F)
  • Auto-detects recursive types (tree, linked list, graph)

Breaking Change Detector:
Semantic Schema Diff

Paste two versions of a schema side-by-side and get a compatibility score instantly. TypeMorph detects breaking changes (type changes, optional→required, field removals), warnings (required→optional, format changes), and safe additions — across JSON, YAML, OpenAPI, and JSON Schema.

  • Compatibility score 0–100 with severity breakdown
  • Supports OpenAPI 3.x · Swagger 2.0 · JSON Schema · YAML

Schema Change Impact:
Know What Breaks Before It Does.

Paste a before and after version of your JSON. TypeMorph traces the change through every class in the type graph and shows exactly which output languages need to be regenerated — all in the browser, instantly.

  • Visual graph: changed (red) · impacted (orange) · safe (gray)
  • 15 language targets checked instantly — no regeneration guesswork

100% Privacy-First Architecture

Your code never leaves your browser. All type inference and code generation runs entirely client-side — no API calls, no upload endpoints.

1. Local-First Engine100% Private

Standard code conversions (JSON to TS/Go/Rust, etc.) are executed 100% entirely inside your browser. Your schema content is never sent to any server. The only exception: if you import from a URL blocked by CORS and explicitly click “Try via proxy,” that URL is fetched through our Cloudflare Worker on your behalf.

2. Schema IntelligenceRule-Based

TypeMorph's inference engine runs entirely in-browser — no AI calls, no API keys. Field-name heuristics auto-detect emails, UUIDs, dates, and URLs to emit precise Zod validators. Schema Quality Score grades your design from A–F using local rule analysis.

3. Zero Data RetentionUser-Controlled

All your conversion data stays exclusively in your browser's local storage — nothing is synced to a server. You can optionally sign in to manage your account and license. You can clear all local data at any moment with one click.

4. Open & Transparent100% Ethical

We will never sell or monetize your data. TypeMorph does not run third-party advertising and does not track your private structural operations. Two things can reach our servers: feedback you explicitly submit, and URLs you opt-in to fetch via the CORS proxy.