Learn how to query data from Convex in a Node.js project.

For instructions for subscriptions instead of point-in-time queries and more project configurations (TypeScript, bundlers, CJS vs ESM) see Node.js notes.

1. Create a new npm project

   Create a new directory for your Node.js project.

   mkdir my-project && cd my-project && npm init -y && npm pkg set type="module"
   

2. Install the Convex client and server library

   Install the convex package which provides a convenient interface for working with Convex from JavaScript.

   Also install the dotenv library for loading .env files.

   npm install convex dotenv
   

3. Set up a Convex dev deployment

   Next, run npx convex dev. This will prompt you to log in with GitHub, create a project, and save your production and deployment URLs.

   It will also create a convex/ folder for you to write your backend API functions in. The dev command will then continue running to sync your functions with your dev deployment in the cloud.

4. Create sample data for your database

   In a new terminal window, create a sampleData.jsonl file with some sample data.

   sampleData.jsonl

   {"text": "Buy groceries", "isCompleted": true}
   {"text": "Go for a swim", "isCompleted": true}
   {"text": "Integrate Convex", "isCompleted": false}
   

5. Add the sample data to your database

   Now that your project is ready, add a tasks table with the sample data into your Convex database with the import command.

   npx convex import --table tasks sampleData.jsonl
   

6. Expose a database query

   Add a new file tasks.js in the convex/ folder with a query function that loads the data.

   Exporting a query function from this file declares an API function named after the file and the export name, api.tasks.get.

   convex/tasks.js

   import { query } from "./_generated/server";
   
   export const get = query({
     args: {},
     handler: async (ctx) => {
       return await ctx.db.query("tasks").collect();
     },
   });
   

7. Connect the script to your backend

   In a new file script.js, create a ConvexHttpClient using the URL of your development environment.

   script.js

   import { ConvexHttpClient } from "convex/browser";
   import { api } from "./convex/_generated/api.js";
   import * as dotenv from "dotenv";
   dotenv.config({ path: ".env.local" });
   
   const client = new ConvexHttpClient(process.env["CONVEX_URL"]);
   
   client.query(api.tasks.get).then(console.log);
   

8. Run the script

   Run the script from the same directory and see the list of tasks logged to the terminal.

See the complete Node.js documentation.