Regular expressions, (regex) are brilliant patterns for searching, matching, validating and replacing text data in programming languages including JavaScript, Python, PHP and Java. But it’s possible to get special characters confused, particularly in the case of special character escaping in a pattern and a replacement. A common pitfall that developers tend to get is mixing…

In working with objects in JavaScript you will sometimes come across some object properties that have values undefined. These properties may produce surprising consequences when you transform an object to JSON, deliver data to an API or store data in a file. Knowing how to get rid of undefined values in JSON objects in JavaScript…

A reason you might want to use JavaScript objects sometime is that the properties may be undefined in some cases. When processing for APIs, storing data or converting JS objects to JSON strings, these values can cause confusion. Removing any undefined values from JSON objects in JavaScript can help ensure your data is always clean,…

Query parameters are useful in JavaScript when handling URLs to pass data from one page to another, filtering results in a search, and passing data on to an API. But if you build the urls yourself, then there are some special characters like spaces, ampersand, plus that can give you unexpected results. However, there is…

Markdown tables are a convenient way of presenting data in tabular format. They’re often employed in documentation, blog posts, tutorials, README files, or technical guides. But errors will arise if you have to show a pipe character (|) in a cell of the table. A pipe character (“|”) is used in Markdown tables for a…

The URL encoding is an essential part of web development, particularly in regard to working with URL, query parameters, search forms and user input. You have already found URL encoding if you’ve ever seen %20, %2B, or %3D in the middle of a URL. These codes can be mystifying at first glance but they come…