Generating Types

Supabase will soon release native type generators that dump your database types for various languages. For now, we support TypeScript through a third-party tool.

Usage with TypeScript

supabase-js ships with type definitions for usage with TypeScript and for convenient IntelliSense auto-complete and documentation in your editor.

When using TypeScript, you can pass the type of database row as a type parameter to the from method to get better auto-completion support down the chain. If you don't provide a type for the row you need to explicitly pass from<any>('tableName').

type Message = {
id: number;
inserted_at: string;
message: string;
user_id: string;
channel_id: number;
author: { username: string };
}
const response = await supabase
.from<Message>('messages') // Message maps to the type of the row in your database.
.select('*, author:user_id(username)')
.match({ channel_id: 2 }) // Your IDE will be able to help with auto-completion.
response.data // Response data will be of type Array<Message>.
// If you don't provide a type for the row you need to explicitly pass `from<any>('tableName')`.
const response = await supabase
.from<any>('messages')
.select('*, author:user_id(username)')
.match({ channel_id: 2 })
response.data // Response data will be of type Array<any>.

Generate database types from OpenAPI specification

Supabase generates a OpenAPI specification file for your database which can be used to generate your data types for usage with TypeScript.

The OpenAPI specification for your Supabase project can be accessed as follows:

https://your-project.supabase.co/rest/v1/?apikey=your-anon-key

Using the open source openapi-typescript tool you can generate your types and store them locally:

npx openapi-typescript https://your-project.supabase.co/rest/v1/?apikey=your-anon-key --output types/supabase.ts

Note: Do note that your local types won't automatically stay in sync with your database, so make sure to regenerate your types after your make changes to your database.

After you have generated your types, you can use them in your TypeScript projects:

import { NextApiRequest, NextApiResponse } from "next";
import { createClient } from "@supabase/supabase-js";
import { definitions } from "../../types/supabase";
const supabase = createClient(
process.env.NEXT_PUBLIC_SUPABASE_URL,
process.env.SUPABASE_SECRET_KEY
);
export default async (req: NextApiRequest, res: NextApiResponse) => {
const allOnlineUsers = await supabase
.from<definitions["users"]>("users")
.select("*")
.eq("status", "ONLINE");
res.status(200).json(allOnlineUsers);
};