CSS Prettify CSS Input Formatted Output Prettify CSS Clear All Control What it does Prettify CSS Places transformed text in Formatted Output. Clear All Empties both text areas. A compact CSS rule can be hard to scan when its selector…
To check whether a string follows a format, such as a code made of two letters, a hyphen and four digits, JavaScript gives you regular expressions. A regular expression, or regex, is a pattern that searches text for a particular…
When an Express app has groups of related routes, such as everything under a project’s URL, you can keep each group in its own module. An Express Router holds those routes and their middleware, and the app mounts it under…
Apps running on Kubernetes are checked on and changed from the terminal with kubectl. It sends each command as a request to your cluster’s API server, the part of Kubernetes that accepts changes. This reference groups kubectl commands by the…
Working with Docker means running commands against a few kinds of objects, such as images and containers. An image is the package Docker creates a container from, and a container is one instance made from that image. The commands below…
Working with AWS from a terminal goes through the AWS CLI, the tool that sends your commands to AWS services. Each command names a service and an operation, and a profile tells the CLI which credentials to use. You’ll set…
The deploy form asks for a start command, and suddenly “free Node.js hosting” feels less straightforward than the price tag suggests. I wanted to see how much the answer changes when a platform runs a persistent server versus code triggered…
Create a MySQL database from Node.js with one query. The trick is connecting without naming a database first, running CREATE DATABASE IF NOT EXISTS, then verifying the schema exists. Here is how to do it with mysql2 and handle the…
I ran SELECT UNIQUE age FROM users on a table with a duplicated age. It returned 22, 17 and 15, the same rows SELECT DISTINCT returns. On MySQL 8 that statement stops before the table is read, because UNIQUE never…
I pointed a Node script at a MySQL table and the connection succeeded. The INSERT failed on a name containing an apostrophe. Pasting values into the SQL string holds until real data arrives, then a name like O’Brien ends the…
