Dump mysql database (json)

mysql-dump.js

require('dotenv').config()
const { promisify } = require('util')
const mysql = require('mysql');
const fs = require('fs');

const db = {
  database: process.env.DATABASE,
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASS,
}

if (!db.database) {
  return console.log('No DATABASE provided')
}

if (!db.host) {
  return console.log('No DB_HOST provided')
}

if (!db.user) {
  return console.log('No DB_USER provided')
}

if (!db.password) {
  return console.log('No DB_PASS provided')
}

const client = mysql.createConnection({
  host: db.host,
  user: db.user,
  password: db.password,
});

client.asyncQuery = promisify(client.query)

const dumpTable = async (tableName) => {
  const fileName = `./backup/${tableName}.json`
  const results = await client.asyncQuery(`select * from ${db.database}.${tableName};`)

  await  fs.promises.writeFile(fileName, JSON.stringify(results))
  console.log(`${tableName} - done!`);
}

async function main() {
  console.log('Getting all table names to backup...')
  const tables = await client.asyncQuery(`SELECT table_name FROM information_schema.tables
WHERE table_schema = '${db.database}'`)
  console.log('Clearing backup folder...')
  await fs.promises.rmdir('./backup', { recursive: true });
  await fs.promises.mkdir('./backup', { recursive: true });

  console.log('Downloading tables...')
  const tableNames = tables.map(({ table_name }) => table_name)
  for (const tableName of tableNames) {
    await dumpTable(tableName)
  }

  console.log('Closing connection...')
  client.end();
}

try {
  main()
} catch (error) {
  console.log('Something went wrong', error)
}