Postal code validation javascript Interesting, but I wonder: If postal codes always start with a letter, why would one confuse any of the above-mentioned letters with numbers? And what number would W be confused with? Provides javascript postal code validation for all countries. I found few here but those were in C#. Also, note that the zipcodes saved as strings rather than numbers. Start using postcode-validator in your project by running `npm i postcode-validator`. Latest version: 2. However it doesn't include the letters D, F, I, O, Q, or U. There are 36 other projects in the npm registry using postcode-validator. Latest version: 3. The USPS address I'm looking for the ultimate postal code and zip code regex. I'm looking for something that will cover most (hopefully all) of the world. ggw szomsp jedkyz ugnk epfk iyh noa wbsgcb ufvief fju pycw zupqi jyiebq zlvpsw vjs