GraphQL Schema to Kysely Interface Generator

Transform GraphQL types, fields, and relations into production-ready TypeScript Kysely table interfaces.

At a glance

GraphQL Schema to Kysely Interface Generator is a free developer utility that transforms GraphQL SDL type definitions into type-safe TypeScript Kysely table interfaces. It handles inverted nullability, synthesizes foreign keys from object relations, normalizes nested arrays, and generates a master Database interface 100% client-side in browser memory.

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100% Client-Side GraphQL SDL to Kysely Interface Generator

Zero Server Uploads

Transform GraphQL SDL types, fields, and relations into type-safe TypeScript Kysely table interfaces and a consolidated Database interface.

Local Browser Sandbox

Presets:

Upload .graphql

PK Strategy

snake_case Columns

Append 'Table' Suffix

Auto Timestamps

GraphQL SDL Input (.graphql) 0 chars

Generated Kysely Interfaces (database.ts)

0 tables

0 Tables 0 Enums 0 Custom Scalars

Inverted Nullability Mapping

GraphQL non-null fields (Type!) map directly to required TypeScript properties, while unadorned fields map cleanly to union null (type | null).

Relational Normalization

Nested array relation fields (e.g. posts: [Post!]!) are excluded from SQL table columns, and object references synthesize foreign key columns (e.g. author_id).

Consolidated Database Interface

Generates a master Database interface with pluralized table keys, ready for type-safe Kysely query builder instantiation.

Why Use This GraphQL Schema to Kysely Interface Generator?

100% Client-Side Privacy: Your GraphQL schema definitions never leave your device or touch any server.

Inverted Nullability Engine: Accurately converts GraphQL ! non-null semantics to strict TypeScript types, and unadorned fields to union null (| null).

Relational Normalization & Foreign Keys: Automatically excludes nested list relations and synthesizes scalar foreign keys (author_id) from object references.

Master Database Interface: Emits consolidated Database mapping interface with plural snake_case table names.

How to Use GraphQL Schema to Kysely Interface Generator

Input GraphQL SDL

Paste your GraphQL SDL schema into the editor or upload a .graphql file.

Configure Options

Select primary key strategy, column naming convention (snake_case), and auto-timestamps.

Copy or Download

Copy the generated TypeScript Kysely interfaces or download database.ts.

GraphQL Schema to Kysely Interface Conversion example

Converts a GraphQL User type into a Kysely UserTable interface with Generated id, non-null name, and nullable bio.

GraphQL SDL Schema Source

type User {
  id: ID!
  name: String!
  bio: String
}

Generated Kysely Interface Processed

import { Generated } from 'kysely';

export interface UserTable {
  id: Generated<string>;
  name: string;
  bio: string | null;
}

export interface Database {
  users: UserTable;
}

Technical Specifications & Engine Details

Technical specifications and engine details for GraphQL Schema to Kysely Interface Generator
Specification	Details
Supported GraphQL Constructs	type, enum, scalar (DateTime, JSON, UUID), object relations
Execution Mode	100% Client-Side In-Browser (Zero server latency)
Nullability Mapping	Inverted (GraphQL ! required → TypeScript required, unadorned → \| null)
Generated Output	TypeScript Kysely Interfaces (Table interfaces, Generated<T>, Database)

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 does GraphQL nullability map to Kysely TypeScript interfaces?

In GraphQL SDL, non-null fields are marked with an exclamation mark (!) and map to required TypeScript properties (e.g. name: string;). Unadorned GraphQL fields are nullable and map to union null types (e.g. bio: string | null;).

How are primary keys and auto-generated columns handled in Kysely?

Fields named id or decorated with @id are wrapped in Kysely Generated<T> helper (Generated<string> for UUIDs or Generated<number> for serial IDs). Timestamp fields such as createdAt and updatedAt are also typed as Generated<Date>.

How are GraphQL object and list relations handled for relational SQL databases?

Nested array relation fields (like posts: [Post!]!) are excluded from the table interface in accordance with relational 3NF normalization. Single object references (like author: User!) automatically synthesize scalar foreign key columns (like author_id: string; or author_id: number;).

Is any GraphQL schema data sent to external servers?

No. All AST parsing, relational normalization, and TypeScript interface generation run 100% locally in your browser memory with zero network requests and complete data privacy.

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated October 2026.