const Firebird = require('node-firebird')
const options = {
  host: '127.0.0.1',
  port: 3050,
  database: 'database.gdb',
  user: 'SYSDBA',
  password: 'masterkey',
  lowercase_keys: false,
  role: null,
  pageSize: 4096
}
Firebird.attach(options, function(err,db){
  if(err) throw err
  db.execute("SELECT * from CLIENTE", function(err,result){
    if(err) throw err
  })
})

Error: Dynamic SQL Error, SQL error code = -204, Table unknown, CLIENTE, At line 1, column 10

CREATE TABLE CLIENTE
(
  CLIENTE_ID integer NOT NULL,
  CODIGO varchar(10),
  TIPO_CLIENTE varchar(1),
  NOME varchar(40),
...