diff --git a/.gitignore b/.gitignore
index 2eea525..eec8101 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
-.env
\ No newline at end of file
+.env
+ip.log
+
+node_modules
diff --git a/.sample.env b/.sample.env
index 7cc7ae4..7cc9b7e 100644
--- a/.sample.env
+++ b/.sample.env
@@ -1,4 +1,9 @@
+# Required
 EMAIL=my@mail.com
 KEY=my_api_key
 ZONE=example.org
-DNS_RECORD=some.example.org
\ No newline at end of file
+DNS_RECORD=some.example.org
+
+# Optional
+#CRON=* * * * *
+#RESOLVER=http://ipv4.icanhazip.com/
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 235d80e..484c724 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,8 @@
-FROM alpine:3.8
+FROM node:14-alpine
 
-ENV file /usr/local/bin/run.sh
+WORKDIR /app
 
-RUN apk add --no-cache --update curl grep bash
+ADD ./package.json script.js yarn.lock ./
+RUN yarn
 
-RUN echo '*  *  *  *  * ${file}' > /etc/crontabs/root
-
-COPY ./run.sh ${file}
-RUN chmod +x ${file}
-
-CMD ["crond", "-l2", "-f"]
\ No newline at end of file
+CMD ["node", "script.js"]
\ No newline at end of file
diff --git a/README.md b/README.md
index 98c4236..ce84985 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # Docker DDNS Cloudflare
-This container is an adapted version of [this](https://gist.github.com/benkulbertis/fff10759c2391b6618dd) script. It runs once every minute and only makes requests if the IP has changed since last time. The IP is resolved by https://canihazip.com.
+
+Simple container for setting setting and updating to your local ip address.
+Only makes requests if the IP has changed since last time.
+By default it runs once every minute and the IP is resolved by https://canihazip.com.
 
 ## Quickstart 🚀
 
@@ -20,7 +23,7 @@ DNS_RECORD=some.example.org
 docker run -d --name ddns --restart always --env-file .env cupcakearmy/ddns-cloudflare
 ```
 
-To check logs: 
+To check logs:
 
 ```bash
 docker logs ddns
@@ -36,3 +39,26 @@ cp .sample.env .env
 # Edit the .env file with your data
 docker-compose up -d
 ```
+
+## Customize
+
+### Custom CRON
+
+By default the script runs every 5 minutes. You can customize this by simply setting the `CRON` value in the `.env` file.
+
+```bash
+# .env
+
+# e.g. every minute
+CRON=* * * * *
+```
+
+### Custom Resolver
+
+By default the script checks the own ip by calling `https://api.ipify.org/`. This also can be configured. It has to be an endpoint that return a plain text containing the ip by get request.
+
+```bash
+# .env
+
+RESOLVER=https://ipv4.icanhazip.com/
+```
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..e7e8520
--- /dev/null
+++ b/package.json
@@ -0,0 +1,9 @@
+{
+  "license": "MIT",
+  "dependencies": {
+    "axios": "^0.19.2",
+    "cloudflare": "^2.7.0",
+    "cron": "^1.8.2",
+    "dotenv": "^8.2.0"
+  }
+}
diff --git a/run.sh b/run.sh
deleted file mode 100644
index 2e28583..0000000
--- a/run.sh
+++ /dev/null
@@ -1,55 +0,0 @@
-#!/bin/bash
-
-# CHANGE THESE
-auth_email=${EMAIL}
-auth_key=${KEY}
-zone_name=${ZONE}
-record_name=${DNS_RECORD}
-
-# MAYBE CHANGE THESE
-ip=$(curl -s http://ipv4.icanhazip.com)
-ip_file="ip.txt"
-id_file="cloudflare.ids"
-log_file="cloudflare.log"
-
-# LOGGER
-log() {
-    if [ "$1" ]; then
-        echo -e "[$(date)] - $1" >> $log_file
-    fi
-}
-
-# SCRIPT START
-log "Check Initiated"
-
-if [ -f $ip_file ]; then
-    old_ip=$(cat $ip_file)
-    if [ $ip == $old_ip ]; then
-        echo "IP has not changed."
-        exit 0
-    fi
-fi
-
-if [ -f $id_file ] && [[ $(wc -l $id_file | cut -d " " -f 1) == 2 ]]; then
-    zone_identifier=$(head -1 $id_file)
-    record_identifier=$(tail -1 $id_file)
-else
-    zone_identifier=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*' | head -1 )
-    record_identifier=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json"  | grep -Po '(?<="id":")[^"]*')
-    echo "$zone_identifier" > $id_file
-    echo "$record_identifier" >> $id_file
-fi
-
-update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" --data "{\"id\":\"$zone_identifier\",\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$ip\"}")
-
-if [[ $update == *"\"success\":false"* ]]; then
-    message="API UPDATE FAILED. DUMPING RESULTS:\n$update"
-    log "$message"
-    echo -e "$message"
-    exit 1 
-else
-    message="$(date) - IP changed to: $ip"
-    echo "$ip" > $ip_file
-    log "$message"
-    echo "$message"
-fi
diff --git a/script.js b/script.js
new file mode 100644
index 0000000..95453f9
--- /dev/null
+++ b/script.js
@@ -0,0 +1,69 @@
+const { readFileSync, writeFileSync, existsSync } = require('fs')
+const Cloudflare = require('cloudflare')
+const Axios = require('axios')
+const { CronJob } = require('cron')
+
+require('dotenv').config()
+
+const { EMAIL, KEY, ZONE, DNS_RECORD, CRON, RESOLVER } = process.env
+
+const cf = Cloudflare({
+  email: EMAIL,
+  key: KEY,
+})
+
+function log(message) {
+  const timestamp = new Date().toISOString().replace(/T/, ' ').replace(/\..+/, '')
+  console.log(timestamp + '\t' + message)
+}
+
+async function getCurrentIp() {
+  const { data } = await Axios({
+    url: RESOLVER || 'https://api.ipify.org/',
+    method: 'GET',
+  })
+  return data
+}
+
+async function checkIfUpdateIsRequired() {
+  const LOG = './ip.log'
+  const current = await getCurrentIp()
+  const saved = existsSync(LOG) ? readFileSync(LOG, 'utf-8') : null
+
+  if (current === saved) return false
+  else {
+    writeFileSync(LOG, current, { encoding: 'utf-8' })
+    return current
+  }
+}
+
+async function update(newIP) {
+  const { result: zones } = await cf.zones.browse({ name: ZONE })
+  if (!zones.length) throw new Error(`No ZONE "${ZONE}" found`)
+
+  const zoneId = zones[0].id
+  const { result: records } = await cf.dnsRecords.browse(zoneId, { name: DNS_RECORD })
+
+  const recordAlreadyExists = records.length
+  if (recordAlreadyExists) {
+    const { id: recordId, ...rest } = records[0]
+    await cf.dnsRecords.edit(zoneId, recordId, { ...rest, content: newIP })
+    log(`Updated:\t${DNS_RECORD} → ${newIP} `)
+  } else {
+    await cf.dnsRecords.add(zoneId, {
+      name: DNS_RECORD,
+      type: 'A',
+      content: newIP,
+    })
+    log(`Created:\t${DNS_RECORD} → ${newIP} `)
+  }
+}
+
+async function main() {
+  const changed = await checkIfUpdateIsRequired()
+  log(`Running. Update required: ${!!changed}`)
+  if (changed) await update(changed).catch((e) => console.error(e.message))
+}
+
+new CronJob(CRON || '*/5 * * * *', main, null, true, null, null, true)
+log('Started service.')
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..d933716
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,216 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+agent-base@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-4.3.0.tgz#8165f01c436009bccad0b1d122f05ed770efc6ee"
+  integrity sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==
+  dependencies:
+    es6-promisify "^5.0.0"
+
+autocreate@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/autocreate/-/autocreate-1.2.0.tgz#522167992c4172c15479e5f88f3486a452a40cba"
+  integrity sha1-UiFnmSxBcsFUeeX4jzSGpFKkDLo=
+
+axios@^0.19.2:
+  version "0.19.2"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.19.2.tgz#3ea36c5d8818d0d5f8a8a97a6d36b86cdc00cb27"
+  integrity sha512-fjgm5MvRHLhx+osE2xoekY70AhARk3a6hkN+3Io1jc00jtquGvxYlKlsFUhmUET0V5te6CcZI7lcv2Ym61mjHA==
+  dependencies:
+    follow-redirects "1.5.10"
+
+capture-stack-trace@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.1.tgz#a6c0bbe1f38f3aa0b92238ecb6ff42c344d4135d"
+  integrity sha512-mYQLZnx5Qt1JgB1WEiMCf2647plpGeQ2NMR/5L0HNZzGQo4fuSPnK+wjfPnKZV0aiJDgzmWqqkV/g7JD+DW0qw==
+
+cloudflare@^2.7.0:
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/cloudflare/-/cloudflare-2.7.0.tgz#ff9249a63ff9b662bd863da21e965c8f82f76012"
+  integrity sha512-yhroBpn2VBczFwiRLpyUc431XiWE+xNs8YvtjAsj1vEA1pVwhpje6BzgLW5iZbulmCuPX48lvX8HizeMWk713g==
+  dependencies:
+    autocreate "^1.1.0"
+    es-class "^2.1.1"
+    got "^6.3.0"
+    https-proxy-agent "^2.1.1"
+    object-assign "^4.1.0"
+    should-proxy "^1.0.4"
+    url-pattern "^1.0.3"
+
+create-error-class@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/create-error-class/-/create-error-class-3.0.2.tgz#06be7abef947a3f14a30fd610671d401bca8b7b6"
+  integrity sha1-Br56vvlHo/FKMP1hBnHUAbyot7Y=
+  dependencies:
+    capture-stack-trace "^1.0.0"
+
+cron@^1.8.2:
+  version "1.8.2"
+  resolved "https://registry.yarnpkg.com/cron/-/cron-1.8.2.tgz#4ac5e3c55ba8c163d84f3407bde94632da8370ce"
+  integrity sha512-Gk2c4y6xKEO8FSAUTklqtfSr7oTq0CiPQeLBG5Fl0qoXpZyMcj1SG59YL+hqq04bu6/IuEA7lMkYDAplQNKkyg==
+  dependencies:
+    moment-timezone "^0.5.x"
+
+debug@=3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
+  integrity sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==
+  dependencies:
+    ms "2.0.0"
+
+debug@^3.1.0:
+  version "3.2.6"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
+  integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
+  dependencies:
+    ms "^2.1.1"
+
+dotenv@^8.2.0:
+  version "8.2.0"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-8.2.0.tgz#97e619259ada750eea3e4ea3e26bceea5424b16a"
+  integrity sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==
+
+duplexer3@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"
+  integrity sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=
+
+es-class@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/es-class/-/es-class-2.1.1.tgz#6ec2243b5a1e3581c0b7eecee0130c9c0d6fb2b7"
+  integrity sha1-bsIkO1oeNYHAt+7O4BMMnA1vsrc=
+
+es6-promise@^4.0.3:
+  version "4.2.8"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.8.tgz#4eb21594c972bc40553d276e510539143db53e0a"
+  integrity sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==
+
+es6-promisify@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/es6-promisify/-/es6-promisify-5.0.0.tgz#5109d62f3e56ea967c4b63505aef08291c8a5203"
+  integrity sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=
+  dependencies:
+    es6-promise "^4.0.3"
+
+follow-redirects@1.5.10:
+  version "1.5.10"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.5.10.tgz#7b7a9f9aea2fdff36786a94ff643ed07f4ff5e2a"
+  integrity sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==
+  dependencies:
+    debug "=3.1.0"
+
+get-stream@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-3.0.0.tgz#8e943d1358dc37555054ecbe2edb05aa174ede14"
+  integrity sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ=
+
+got@^6.3.0:
+  version "6.7.1"
+  resolved "https://registry.yarnpkg.com/got/-/got-6.7.1.tgz#240cd05785a9a18e561dc1b44b41c763ef1e8db0"
+  integrity sha1-JAzQV4WpoY5WHcG0S0HHY+8ejbA=
+  dependencies:
+    create-error-class "^3.0.0"
+    duplexer3 "^0.1.4"
+    get-stream "^3.0.0"
+    is-redirect "^1.0.0"
+    is-retry-allowed "^1.0.0"
+    is-stream "^1.0.0"
+    lowercase-keys "^1.0.0"
+    safe-buffer "^5.0.1"
+    timed-out "^4.0.0"
+    unzip-response "^2.0.1"
+    url-parse-lax "^1.0.0"
+
+https-proxy-agent@^2.1.1:
+  version "2.2.4"
+  resolved "https://registry.yarnpkg.com/https-proxy-agent/-/https-proxy-agent-2.2.4.tgz#4ee7a737abd92678a293d9b34a1af4d0d08c787b"
+  integrity sha512-OmvfoQ53WLjtA9HeYP9RNrWMJzzAz1JGaSFr1nijg0PVR1JaD/xbJq1mdEIIlxGpXp9eSe/O2LgU9DJmTPd0Eg==
+  dependencies:
+    agent-base "^4.3.0"
+    debug "^3.1.0"
+
+is-redirect@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-redirect/-/is-redirect-1.0.0.tgz#1d03dded53bd8db0f30c26e4f95d36fc7c87dc24"
+  integrity sha1-HQPd7VO9jbDzDCbk+V02/HyH3CQ=
+
+is-retry-allowed@^1.0.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/is-retry-allowed/-/is-retry-allowed-1.2.0.tgz#d778488bd0a4666a3be8a1482b9f2baafedea8b4"
+  integrity sha512-RUbUeKwvm3XG2VYamhJL1xFktgjvPzL0Hq8C+6yrWIswDy3BIXGqCxhxkc30N9jqK311gVU137K8Ei55/zVJRg==
+
+is-stream@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
+  integrity sha1-EtSj3U5o4Lec6428hBc66A2RykQ=
+
+lowercase-keys@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/lowercase-keys/-/lowercase-keys-1.0.1.tgz#6f9e30b47084d971a7c820ff15a6c5167b74c26f"
+  integrity sha512-G2Lj61tXDnVFFOi8VZds+SoQjtQC3dgokKdDG2mTm1tx4m50NUHBOZSBwQQHyy0V12A0JTG4icfZQH+xPyh8VA==
+
+moment-timezone@^0.5.x:
+  version "0.5.31"
+  resolved "https://registry.yarnpkg.com/moment-timezone/-/moment-timezone-0.5.31.tgz#9c40d8c5026f0c7ab46eda3d63e49c155148de05"
+  integrity sha512-+GgHNg8xRhMXfEbv81iDtrVeTcWt0kWmTEY1XQK14dICTXnWJnT0dxdlPspwqF3keKMVPXwayEsk1DI0AA/jdA==
+  dependencies:
+    moment ">= 2.9.0"
+
+"moment@>= 2.9.0":
+  version "2.27.0"
+  resolved "https://registry.yarnpkg.com/moment/-/moment-2.27.0.tgz#8bff4e3e26a236220dfe3e36de756b6ebaa0105d"
+  integrity sha512-al0MUK7cpIcglMv3YF13qSgdAIqxHTO7brRtaz3DlSULbqfazqkc5kEjNrLDOM7fsjshoFIihnU8snrP7zUvhQ==
+
+ms@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
+  integrity sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=
+
+ms@^2.1.1:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
+  integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
+
+object-assign@^4.1.0:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
+  integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
+
+prepend-http@^1.0.1:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
+  integrity sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw=
+
+safe-buffer@^5.0.1:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+  integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
+
+should-proxy@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/should-proxy/-/should-proxy-1.0.4.tgz#c805a501abf69539600634809e62fbf238ba35e4"
+  integrity sha1-yAWlAav2lTlgBjSAnmL78ji6NeQ=
+
+timed-out@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/timed-out/-/timed-out-4.0.1.tgz#f32eacac5a175bea25d7fab565ab3ed8741ef56f"
+  integrity sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=
+
+unzip-response@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/unzip-response/-/unzip-response-2.0.1.tgz#d2f0f737d16b0615e72a6935ed04214572d56f97"
+  integrity sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=
+
+url-parse-lax@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-1.0.0.tgz#7af8f303645e9bd79a272e7a14ac68bc0609da73"
+  integrity sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=
+  dependencies:
+    prepend-http "^1.0.1"
+
+url-pattern@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/url-pattern/-/url-pattern-1.0.3.tgz#0409292471b24f23c50d65a47931793d2b5acfc1"
+  integrity sha1-BAkpJHGyTyPFDWWkeTF5PStaz8E=