Sample jsforce code to create a new record in Salesforce

jsforce-record-creation.js

  const conn = new jsforce.Connection({
    // you can change loginUrl to connect to sandbox or prerelease env.
    loginUrl: 'https://example.my.salesforce.com/'
  })
  conn.login(username, password, function (err, userInfo) {
    if (err) {
      return console.error(err)
    }
    // Now you can get the access token and instance URL information.
    // Save them to establish connection next time.
    console.log(conn.accessToken)
    console.log(conn.instanceUrl)
    // logged in user property
    console.log('User ID: ' + userInfo.id)
    console.log('Org ID: ' + userInfo.organizationId)
    // ...

    // Single record creation
    conn.sobject('Contact').create(
      {
        FirstName: 'Jane',
        LastName: 'Doe',
        Email: 'test@test.com'
      },
      function (err, ret) {
        if (err || !ret.success) {
          return console.error(err, ret)
        }
        console.log('Created record id : ' + ret.id)
      }
    )
  })