pg.connect not a function?

user_1837296 0
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There appears to be a lot of documentation (e.g. https://devcenter.heroku.com/articles/heroku-postgresql#connecting-in-node-js, but also elsewhere including this site) indicating that the proper method of connecting with the pg.js Node package is using pg.connect. However, I attempted (after previous problems with my actual code) to test by using the exact code shown on the aforementioned Heroku documentation:

var pg = require('pg');

pg.defaults.ssl = true;
pg.connect(process.env.DATABASE_URL, function(err, client) {
  if (err) throw err;
  console.log('Connected to postgres! Getting schemas...');

  client
    .query('SELECT table_schema,table_name FROM information_schema.tables;')
    .on('row', function(row) {
      console.log(JSON.stringify(row));
    });
});

And I got the error message "pg.connect is not a function". What is going on, and how do I fix it?

pg node.js heroku
4 Answers

pg: postgresql => (https://www.npmjs.com/package/pg)

⚠️ pg.connect is deprecated since version 6.3 ❌

BE CAREFUL : Instead there is another method called pool

Here is how you can set up node-postgres easily with express.

const pg        = require('pg');
const express   = require('express');
const app       = express();

const config = {
    user: 'postgres',
    database: 'YOURDBNAME',
    password: 'YOURPASSWORD',
    port: 5432                  //Default port, change it if needed
};

// pool takes the object above -config- as parameter
const pool = new pg.Pool(config);

app.get('/', (req, res, next) => {
   pool.connect(function (err, client, done) {
       if (err) {
           console.log("Can not connect to the DB" + err);
       }
       client.query('SELECT * FROM GetAllStudent()', function (err, result) {
            done();
            if (err) {
                console.log(err);
                res.status(400).send(err);
            }
            res.status(200).send(result.rows);
       })
   })
});

app.listen(4000, function () {
    console.log('Server is running on port 4000');
});
Admin1

If you want to stick with the code you have you can use an older version of Postgres.

First, apply:

npm uninstall postgresql

and then install version 6.1.2 (which is compatible with the code you mentioned):

npm install pg@6.1.2
user_87334270 
var express = require('express');
var app = express();
const pgp = require('pg-promise')();
var connectionString = "";
var parse = require('pg-connection-string').parse;

try {
    var connectionString = "postgres://USERNAME:@localhost:5432/DBNAME";
    var config = parse(connectionString);
    config.password = "PASSWORD";
    var dbcon = pgp(config);
    app.set('dbCon', dbcon);
} 
catch (error) {
    console.log("DB error")
}

module.exports = app;

user_81837350
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