Validation module in NodeJS

As the process of finding modules for a new project goes on, we go through a lot of libraries, discover many modules with a lot of dependencies and test them. Then we install package.json and get an error message, because NodeJS has a different version. We cry and start the search again.

Now we are working on the project cooklook.ru and using full-stack javascript. Our team stores everything in Docker. If we edit package.json or change docker file, Docker rebuilds the project. It lasts a few minutes, takes up a lot of memory and loads cpu to 100%. For modules such as express, it’s normal. But if you check “isEmail” or “isString” with min/max characters, you don’t want to pull 30 or more dependencies into your project (I saw a module with 2000 dependencies).

Our validation module was created to test the most necessary things without dependencies:
— isStr, check for a string with the minimum and maximum number of characters
— isEmail, email validation
— isInt, check for integer, with min/max
— isArr, check for an array, with min/max length of array
— isExist, check for undefined, null, NaN

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