Infer TypeScript interfaces from sample JSON objects.
Input / Output
Input, output, and copy actions stay in this main surface. Examples and reference checks are separated below.
Local session
Input state is saved only in this browser so you can restore the last workspace without an account.
Open examples, checks, and related tools only after the primary input/output flow is done.
Extract a JSON field
Format the payload, test a path with wildcards or recursive keys, then keep the shape for code.
Format and validate the pasted response before selecting fields.
Test dot paths, bracket keys, wildcards, and recursive key searches.
Create a starter type once the field shape is clear.
Format an API response
Clean a pasted JSON payload, inspect paths, then create types or schema checks.
Validate and format the payload, then copy a compact API response report.
Pull the exact field path needed by code or docs.
Turn the sample shape into a starter interface.
Before copying
Common failure cases
Related tools
Guides
Open examples, checks, and related tools only after the primary input/output flow is done.
{"id":1,"name":"Bob"}Copy-ready output
export interface Root {
id: number;
name: string;
active: boolean;
roles: string[];
}