TypeORM Entity to JSON Schema Converter

Instant in-browser TypeORM entity to JSON Schema converter with inverted nullability, column constraints, and relations.

At a glance

TypeORM Entity to JSON Schema Converter transforms TypeScript entity classes decorated with @Entity, @Column, and @PrimaryGeneratedColumn into Draft 2020-12 and Draft-07 JSON Schema documents. It executes 100% client-side in browser memory, automatically mapping column constraints, inverted nullability, enums, and relation pointers with zero server uploads.

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100% Client-Side TypeORM to JSON Schema Converter

Zero Server Uploads

Parse TypeORM TypeScript entities (@Entity, @Column, @PrimaryGeneratedColumn, relations) into standard JSON Schema (Draft 2020-12 & Draft-07) with inverted nullability.

Local Browser Sandbox

Presets:

Upload .ts

JSON Schema Draft:

Output Structure:

JSON Indentation:

Virtual Relations:

TypeORM TypeScript Entity 0 lines • 0 chars

JSON Schema Output

0 bytes

Entities

Properties

Enums

Output Size

0 B

Why Use This TypeORM Entity to JSON Schema Converter?

100% Client-Side Privacy: Your entity code never leaves your device or touches any external server.

Full Decorator Support: Parses @Entity, @PrimaryGeneratedColumn, @PrimaryColumn, @Column, @CreateDateColumn, and @UpdateDateColumn.

Inverted Nullability Engine: Mandatory fields are mapped to required arrays; nullable fields are cleanly excluded.

Format & Constraint Mapping: Maps string lengths to maxLength, integers to integer, bigint to int64, and timestamps to date-time.

Multi-Entity Definitions: Organizes multiple classes into modular $defs or definitions dictionaries.

How to Use TypeORM Entity to JSON Schema Converter

Input TypeORM Code

Paste your TypeORM TypeScript entity code or upload a .ts file into the editor.

Select Schema Options

Choose between Draft 2020-12 ($defs) or Draft-07 (definitions), indentation, and relation inclusion.

Copy or Download

Copy the formatted JSON Schema to your clipboard or download schema.json immediately.

TypeORM Entity to JSON Schema Conversion example

Demonstrates automated extraction of TypeORM User entity into standard JSON Schema object with inverted nullability (mandatory fields in required array) and maxLength constraint.

Sample TypeORM Entity (TypeScript) Source

@Entity('users')
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ length: 100 })
  email: string;

  @Column({ nullable: true })
  bio: string;
}

Sample JSON Schema Processed

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "User",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "email": {
      "type": "string",
      "maxLength": 100
    },
    "bio": {
      "type": "string"
    }
  },
  "required": [
    "id",
    "email"
  ]
}

Technical Specifications & Engine Details

Technical specifications and engine details for TypeORM Entity to JSON Schema Converter
Specification	Details
Supported Decorators	@Entity, @PrimaryGeneratedColumn, @Column, @CreateDateColumn, @UpdateDateColumn, @ManyToOne, @OneToMany
JSON Schema Drafts	Draft 2020-12 ($defs) and Draft-07 (definitions)
Inverted Nullability	Mandatory columns → required array, nullable: true or ? → omitted from required
Execution Mode	100% Client-Side In-Browser (Zero server latency, complete privacy)
Multi-Entity Support	Automatic partitioning into $defs / definitions with cross-entity $ref pointers

Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

Your files remain strictly on your local device. Zero data is transmitted to external servers.

Frequently Asked Questions

How are TypeORM column nullability rules mapped to JSON Schema?

In TypeORM, columns are required by default unless configured with { nullable: true } or marked with ?. In JSON Schema, properties are optional unless listed in the required array. The converter inverts this relationship: required TypeORM columns are placed into the required array, while nullable properties are excluded.

Which JSON Schema drafts are supported?

The converter supports both modern JSON Schema Draft 2020-12 (using $defs) and legacy Draft-07 (using definitions), selectable via the options toolbar.

How does the tool handle TypeORM relations (@ManyToOne, @OneToMany)?

Relations are translated into schema references ($ref) pointing to the target entity definition inside $defs or definitions. You can also toggle relations off if you only want table scalar fields.

Does this tool support TypeScript enums in TypeORM?

Yes. Standalone TypeScript enum declarations and @Column({ type: 'enum', enum: ... }) decorators are extracted and mapped to JSON Schema string types with explicit enum arrays.

Methodology

Zero telemetry or external network calls are dispatched.

Last updated October 2026.