eg-id-validate/index.js

A javascript library to validate the Egyptian ID

/*
Error types:
1: non string type of id
2: id of invalid length
3: id has invalid century, only 1,2 and 3 are accepted
4: id has invalid date of birth


*/



exports.checker = function (nid) {
    const id = nid.trim()
    const d = new Date()
    const this_year = d.getFullYear()-2000
    const this_month = d.getMonth()+1

    //assert argument type to be string
    if (typeof id !== "string") return {valid: false, error_code: 1}

    //check id length
    if (id.length !== 14) return {valid: false, error_code: 2}

    const century = parseInt(id.substr(0,1))
    const year = parseInt(id.substr(1,2))
    const month = parseInt(id.substr(3,2))
    const day = parseInt(id.substr(5,2))
    const gov = parseInt(id.substr(7,2))
    const sex = parseInt(id.substr(12,1))%2? 'm':'f'

    //check century value
    if (! [2,3].includes(century)) return {valid: false, error_code: 3}

    //check date of birth
    if (year<20 && century===2) return {valid: false, error_code: 4}
    if (year>this_year && century===3) return {valid: false, error_code: 4}
    if (month>12) return {valid: false, error_code: 4}
    if (month>this_month && year===this_year) return {valid: false, error_code: 4}
    if (day>31) return  {valid: false, error_code: 4}
    if (month===2 && day>29) return {valid: false, error_code: 4}
    if ([4,6,9,11].includes(month)&& day>30) return {valid: false, error_code: 4}


    //check governorate
    if (gov<1) return {valid: false, error_code: 5}
    if (gov>35 && gov!==86 && gov!==88) return {valid: false, error_code: 5}
    return {
        valid: true,
        age: 10,
        gov: gov,
        dob: "",
        sex: sex
    }
}