Creating a Node/SQLite Backend

My Definition Wordle-project needs porting to a more user friendly UI, so I'll need to connect the data from SQLite to a Node backend. Come along for the journey!

Kalle Tolonen
Sept. 11, 2022

Setup for the server

First, I made a new directory for my backend.

mkdir deftle-sqlite-be
cd deftle-sqlite-be
npm init

I named the entry point as server.js.

npm install express
npm install sqlite3
npm install md5
micro server.js

// Create express app
var express = require("express")
var app = express()

// Server port
var HTTP_PORT = 8000 
// Start server
app.listen(HTTP_PORT, () => {
    console.log("Server running on port %PORT%".replace("%PORT%",HTTP_PORT))
});
// Root endpoint
app.get("/", (req, res, next) => {
    res.json({"message":"Ok"})
});

// Insert here other API endpoints

// Default response for any other request
app.use(function(req, res){
    res.status(404);
});
#package.json

    "start": "node server.js",

#added this under scripts.

To test things out, I started the server and checked my localhost:8000.

npm run start (runs start-script)

NodeJS backend working with test data
The server was running.

Setup for the database

I have my db in the data/-directory, that’s relative to the directory my code is in.

#database.js

var sqlite3 = require('sqlite3').verbose()

const DBSOURCE = "data/words.db"

let db = new sqlite3.Database(DBSOURCE, (err) => {
    if (err) {
      // Cannot open database
      console.error(err.message)
      throw err
    }else{
        console.log('Connected to the SQLite database.')
        db.run(`SELECT * FROM wordlist`)
    }
});

module.exports = db

After this, I made a copule of additions to my server.js.

#server.js

// Create express app
var express = require("express")
var app = express()
var db = require("./database.js")

// Server port
var HTTP_PORT = 8000 
// Start server
app.listen(HTTP_PORT, () => {
    console.log("Server running on port %PORT%".replace("%PORT%",HTTP_PORT))
});
// Root endpoint
app.get("/", (req, res, next) => {
    res.json({"message":"Ok"})
});

// Insert here other API endpoints
app.get("/api/allwords", (req, res, next) => {
    var sql = "select * from wordlist"
    var params = []
    db.all(sql, params, (err, rows) => {
        if (err) {
          res.status(400).json({"error":err.message});
          return;
        }
        res.json({
            "message":"success",
            "data":rows
        })
      });
});

// Default response for any other request
app.use(function(req, res){
    res.status(404);
});

My new API will now query all the words, so that’s a great starting point to construct other things on.

NodeJS backend working with test data

Source(s)

Developerhowto

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