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Data Processingpublic tool

JSON to TypeScript

Turn a JSON sample into TypeScript interfaces — nested shapes become named types, mixed values become unions, and missing keys become optional properties.

Root type
Root
Declaration
interfaces
Status
3 types
Local
100% browser

JSON sample

The shape the types are inferred from

TypeScript

Generated declarations

export interface Root {
  id: number
  name: string
  active: boolean
  score: null
  tags: string[]
  profile: Profile
  projects: Project[]
}

export interface Profile {
  createdAt: string
  count: number
}

export interface Project {
  title: string
  stars: number
  archived: boolean
  notes?: null
}