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Web

This section contains my notes during web development, including frontend, backend, and database ops. Specifically, this section is about MongoDB, nodeJS, Expressjs, Python, and Semantic UI.

How to send mail on Linux

To send emails on linux to other remote email addresses, we will first need to install the postfix server and mail command via the following command: sudo apt-get install mailutils # For debain & Ubuntu During the installation, a prompt similar to this should pop up: This the configuration panel for

koa-router middleware explicitly calling `await next()` to enter next middleware

Unlike Expressjs, in koa-router, user need to explicitly call await next() to enter the next middleware rather than to return to last level middleware.

Export csv and json data from dokku-mongo service

1. exec mongoexport command inside the docker container follow the official documentation from MongoDB 2. copy it using docker cp <CONTAINER_ID>:<FILENAME> <INTENDED_DIR>

Issue for input cursor display problem on iOS devices

Issue Symptom The web page for this is based on the semantic-ui framework. Clearly we can see that the cursor for user input is not at the right position. The users will need to click done or exit the keyboard for avoiding this issue. Cause This problem is attributed to

Dokku FQDN Setup

After I ran the dokku installation script on my fresh new Ubuntu system, the console outputed such error: This installation script requires that you have a hostname set for the instance. Please set a hostname for 127.0.0.1 in your /etc/hosts The solution, indeed, is fairly simple.

Error Codes and Messages Explanation

Error codes and error messages are often use in api requests for signifying status. Here are the error codes, messages, and HTTP status code used by me in my applications. You may feel free to use them in your own projects.

Dokku Installation

Dokku is "the smallest PaaS" implementation (Platform as Service). It functions as a simplified version of heroku on Docker, allowing you to deploy your web apps through a simple git push.

Frame v1.0.0

Frame A personal projects website based on Nodejs for high school students to show their works. v1.0.0 was finished in 10 hrs. Introduction Frame was built initially for high school students to present their works in an elegant and simple way. Frame's goal is to let