# apphelp tool profile
name: JSON to TypeScript
tool: tool-jsontypescript
domain: jsontypescript.apphelp.net
canonical: https://jsontypescript.apphelp.net/en
summary: Convert JSON objects and arrays into readable TypeScript interfaces or type aliases locally in the browser.
inputs: Valid JSON object or array, plus optional root name and output-style settings.
outputs: Copyable and downloadable TypeScript declarations with inferred nested types, arrays, nullable values, unions, and optional keys.
use-cases: bootstrap API response models; document JSON payload shapes; generate TypeScript interfaces from examples; infer optional properties from arrays of objects; create browser-local type definitions without uploading data
keywords: json to typescript, json to typescript interface, json to type alias, generate typescript from json, typescript interface generator
languages: en, zh-CN, zh-TW, ar, de, fr
capabilities: interface or type-alias output; nested named types; arrays and unions; optional missing properties; nullable values; readonly fields; ISO date detection; camelCase keys; copy; TypeScript download
limitations: output is inferred from example values and does not perform runtime validation; empty arrays require an unknown or any fallback; mixed values may produce unions
seo: locale-routed canonical and hreflang metadata, sitemap, robots, SoftwareApplication, BreadcrumbList, FAQPage, and HowTo structured data
geo: explicit answer summary, task and input/output contract, examples, FAQ content, use cases, caveats, and a machine-readable llm.txt profile
privacy: all JSON parsing and type generation happen locally in the browser; no JSON upload
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true