I had to change select.js code so that it works without error #2
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using the previous code i got this error
SqlError: (conn:-1, no: 45027, SQLState: HY000) Cannot add request to pool, pool is closed sql: SELECT * from demo.contacts
at Object.module.exports.createError (/home/camindo/Node/mariadbnodeconnection/node_modules/mariadb/lib/misc/errors.js:66:10)
at /home/camindo/Node/mariadbnodeconnection/node_modules/mariadb/lib/pool.js:538:24 {
sqlMessage: 'Cannot add request to pool, pool is closed',
sql: 'SELECT * from demo.contacts',
fatal: false,
errno: 45027,
sqlState: 'HY000',
code: 'ER_POOL_ALREADY_CLOSED'