Kysely Interface to GraphQL Schema Generator

Convert Kysely table interfaces, Generated<T>, and ColumnType constructs into production-ready GraphQL SDL.

At a glance

Kysely Interface to GraphQL Schema Generator is a free developer utility that transforms Kysely TypeScript table interfaces into GraphQL Schema Definition Language (SDL). It unwraps Generated<T> and ColumnType helpers, handles inverted nullability, and synthesizes root queries, mutations, and inputs 100% client-side in browser memory.

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100% Client-Side Kysely Interface to GraphQL SDL Generator

Zero Server Uploads

Convert Kysely TypeScript table interfaces, Generated<T>, and ColumnType constructs into GraphQL SDL types, operations, and input objects.

Local Browser Sandbox
Presets:
0 chars
0 types
0 Tables 0 Enums 0 Queries 0 Mutations 0 Inputs

Inverted Nullability Mapping

TypeScript required fields (without | null or ?) become non-null Type! in GraphQL, while union nullable types map to unadorned optional GraphQL fields.

Kysely Helpers Unwrapped

Automatically unwraps Generated<T> and ColumnType<Select, Insert, Update>. Database-generated fields are excluded from mutation input objects.

Virtual Relations & Operations

Synthesizes graph relations from foreign keys (e.g. author_id → author: User!) and generates complete root queries, mutations, and typed input payloads.

Why Use This Kysely Interface to GraphQL Schema Generator?

100% Client-Side Privacy: Your TypeScript table definitions never leave your device or touch any server.
Inverted Nullability Engine: Accurately converts TypeScript/Kysely required and union null types to strict GraphQL ! SDL semantics.
Kysely Helper Unwrapping: Unwraps Generated<T> and ColumnType<Select, Insert, Update> constructs seamlessly.
CRUD Operations & Inputs: Automatically generates root Query, Mutation, and Create/Update input types.

How to Use Kysely Interface to GraphQL Schema Generator

1

Input Kysely Code

Paste your TypeScript Kysely table interfaces into the editor or upload a .ts file.

2

Configure Options

Toggle table suffix stripping, queries, mutations, input types, and virtual relations.

3

Copy or Download

Copy the generated GraphQL SDL or download it as schema.graphql.

Kysely Interface to GraphQL Conversion example

Converts a Kysely UserTable interface with Generated id and nullable email into GraphQL SDL with inverted nullability.

Kysely TypeScript Interfaces Source 
export interface UserTable {
  id: Generated<number>;
  name: string;
  email: string | null;
}
Generated GraphQL SDL Processed 
type User {
  id: ID!
  name: String!
  email: String
}

type Query {
  users: [User!]!
  user(id: ID!): User
}

Technical Specifications & Engine Details

Technical specifications and engine details for Kysely Interface to GraphQL Schema Generator
Specification Details
Supported Constructs interface, type, Database/DB map, Generated<T>, ColumnType<S,I,U>, enums
Execution Mode 100% Client-Side In-Browser (Zero server latency)
Nullability Mapping Inverted (Kysely required → GraphQL !, nullable/optional → unadorned)
Generated Output GraphQL SDL (Types, Enums, Queries, Mutations, Inputs)
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 Kysely inverted nullability map to GraphQL SDL?
In Kysely TypeScript, non-null properties are required by default and map to non-null GraphQL fields marked with an exclamation mark (!). Properties declared with union null (| null) or optionality (?) map to unadorned nullable GraphQL fields.
How are Kysely Generated<T> and ColumnType helpers handled?
Fields wrapped in Generated<T> unwrap the inner type T and are marked as database-managed primary keys (id: ID!), automatically excluding them from CreateInput objects. ColumnType<Select, Insert, Update> maps SelectType to object types, InsertType to CreateInput, and UpdateType to UpdateInput.
Are foreign keys converted to GraphQL object relations?
Yes. When virtual relations are enabled, foreign key fields like author_id synthesize both the foreign key scalar (author_id: ID!) and a typed virtual relation field (author: User!).
Is any TypeScript code sent to external servers?
No. All parsing and SDL generation executes 100% locally in your browser memory using an isomorphic JavaScript engine with zero network calls 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 .

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