Example Typescript implementation of Notion.so API

notion.ts

import { Client } from '@notionhq/client';
import { Block, User } from '@notionhq/client/build/src/api-types';

export type ITodo = {
  id: string;
  title: string;
  assignedTo: User[];
  dateCreated: Date;
  dueDate: Date[];
  priority: string;
  status: string;
  blocks: Block[];
};

export class NotionClient {
  client: any;

  constructor() {
    if (!process.env.NEXT_PUBLIC_NOTION_TOKEN) {
      throw new Error('No API TOKEN in .env');
    }

    this.client = new Client({
      auth: process.env.NEXT_PUBLIC_NOTION_TOKEN
    });
  }

  async getPage() {
    const db = await this.client.databases.query({
      database_id: 'YOUR_DATABASE_ID'
    });

    const result = await Promise.all(
      db.results.map(async (todo: any) => {
        return await this.transformTodo(todo);
      })
    );
    return result;
  }

  private async transformTodo(todo: any): Promise<ITodo> {
    // get blocks for this item...
    const blocks = await this.client.blocks.children.list({
      block_id: todo.id.split('-').join('')
    });

    return {
      id: todo.id,
      title: todo.properties.Name.title[0].plain_text,
      assignedTo: todo.properties.Assign.people,
      dateCreated: todo.properties['Date Created'].created_time,
      dueDate: todo.properties['Due Date']?.date || null,
      priority: todo.properties.Priority.select,
      status: todo.properties.Status?.select.name || null,
      blocks: blocks.results || null
    };
  }
}