Writing Swift and vue.js front-end application process, the following website as a tool, can provide a lot of development convenience. I use them a lot.

  1. Provide HTTP authentication data

httpbin.org

When writing the client, the backend is often required to provide json data via HTTP for technical verification. You can do this.

  1. Clear code blank lines

Textmechanic.com/text-tools/…

  1. Front-end editor, you can see HTML, JS, CSS and effects on a screen at the same time

codepen.io/

  1. Placeholder images

placeholder.com/

Sometimes, need a specified size of the picture, the picture is not important, the size is more important, can use this site to generate

  1. Timely recorded, interactive learning programming site

scrimba.com/

  1. Word counts

wordcounttools.com/