JSON to Code

Paste representative JSON and generate typed models or SQL instantly—entirely in your browser.

Raw JSON

Object, array, or primitive · 1 MB max

Code output

Inferred from the current JSON shape

Root type name

Names affect generated code only and are never persisted.

export interface Root {
  id: number;
  project_name: string;
  active: boolean;
  owner: OwnerItem;
  tags: Array<string>;
  releases: Array<Release>;
}

export interface OwnerItem {
  name: string;
  email: string;
}

export interface Release {
  version: string;
  stable: boolean;
  downloads: number;
}

Tool documentation

Convert JSON into typed models and SQL schemas

Turn representative JSON into readable starter code for TypeScript, C#, Kotlin, PostgreSQL, or SQLite without sending the payload to a conversion service.

100% Client-Side

Conversion runs locally in your browser.

No Payload Logging

Your tool input is never uploaded or logged.

Private by Design

Input stays on your device and is not persisted.

How to use

1
Paste JSON or load the sample
Add a representative JSON object or array in the left editor. DevCrate validates the input and updates the output as you type.
2
Choose the target language
Switch between TypeScript, C#, Kotlin, PostgreSQL, and SQLite without re-entering the source JSON.
3
Review, copy, or download
Check the generated names and inferred types, then copy the result or download a language-appropriate file.

Technical details

Representative sample inference

Generated types describe the values present in your sample. Review optional fields, nullable values, mixed arrays, and API-specific formats against the real contract before production use.

Nested objects and arrays

Nested objects become named models and arrays become typed collections. Field names are normalized for each target language while serializer mappings preserve original JSON keys where needed.

SQL output is a starter schema

PostgreSQL and SQLite modes infer practical column types and flatten representative values into a starting CREATE TABLE statement. Relationships, constraints, indexes, and migrations still require domain review.

Privacy & security verification

DevCrate uses the browser's native parser and local JavaScript generation logic. The tool makes no processing API request, stores no payload on a server, and creates no server-side log of your input. Ordinary static page requests may still be logged by the site host, but they never contain your tool input.