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Nodejs Nodemailer example

Hello. In this tutorial, we will understand the nodemailer module in a simple nodejs application. We will set up a fake smtp server (e.g. smtp4dev) for localhost development and understand the package implementation. smtp4dev is an open-source service that emulates an smtp email server for email testing and debugging purposes. 1. Introduction Nodemailer is an npm module used for sending ...

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Docker Copy Files

1. Introduction In this example, we will find out how to use copy files inside Docker. Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications. By taking ...

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What is /bin/bash?

1. Introduction Bash is known also as a Unix Shell, and was written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. The first version was released in 1989 and it was used as a default login shell for most Unix distributions. Currently, the bash is available on Windows 10 via Windows Subsystem ...

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Query in graphql

Bipartite Graph

Hello readers. In this tutorial, we will understand and implement the query in graphql. 1. Introduction GraphQL is an API syntax that defines how to fetch data from one or more databases. It was developed by Facebook to optimize the RESTful api calls. It is a data query and manipulation language for api’s. It is faster, simple, and easier to ...

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Upsert in MongoDB

1. Introduction This is an in-depth article on how to create MongoDB Upsert Example. Mongo Database is a no SQL database. It has capabilities such as query language to retrieve from the database. It also provides operational and administrative procedures. A document in Mongo Database is a data structure that has field and value pairs. These documents are like JSON ...

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Mutations in graphql

Bipartite Graph

Hello readers. In this tutorial, we will understand and implement mutations in graphql. 1. Introduction GraphQL is an API syntax that defines how to fetch data from one or more databases. It was developed by Facebook to optimize the RESTful API calls. It is a data query and manipulation language for API’s. It is faster, simple, and easier to implement ...

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Expressjs and Knexjs sql query builder

Bipartite Graph

Hello readers. In this tutorial, we will understand the knexjs sql builder library in expressjs application and perform some crud operations. 1. Introduction knex sql builder library for javascript that provides an easy interface to access a database and perform all the related operations. It supports multiple database engines like Mysql, Postgresql, SQLite, Oracle, and many more. It supports features ...

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Postgres and Graphql

Bipartite Graph

Hello readers. In this tutorial, we will bring in the postgres (running as a Docker container) to integrate with graphql and implement the CRUD operations. The application will expose different endpoints with the help of the apollo server. 1. Introduction GraphQL is an API syntax that defines how to fetch data from one or more databases. It was developed by ...

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Command Not Found Using Sudo

1. Introduction This is an in-depth article related to the Sudo command in Linux and how to avoid command not found error. Sudo is super user do command . It is used as a prefix for superuser commands to be executed. The privileges while executing will be of superusers. In windows, the equivalent is run as administrator. sudo permission is ...

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No such file or directory Error

1. Introduction When you run commands, sometimes part of the command is incorrect or the command is unable to execute the action. In case of unexpected behavior, an error will arise, like “No such file or directory Error”. Most of the time the errors should be self-explanatory for the problem of the executed command. In Linux, when you run some ...

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