How to remove all CloudFlare DNS (bulk remove)

CloudFlare doesn’t allow you to delete all the DNS settings from their admin console, but you can do so through their API : https://api.cloudflare.com/

Writing script for this is boring. I prefer a Postman collection, it’s the simplest and easiest to launch 😊

1. Create a CloudFlare API key here.
2. Get Postman collection here, ready to use.
3. Configure collection variables.
4. Read and configure script into the second request (DNS List records — Tab Tests). I have created a filter by IP, but you can delete it if it is not necessary for you.
5. Run into Postman Collection Runner.

Details

For each request, we must add 2 authentication headers : X-Auth-Email and X-Auth-Key.

We need 2 requests : list dns entries, remove an entry

• List DNS entries

GET https://api.cloudflare.com/client/v4/zones/:zone_identifier/dns_records

How to find `zone_identifier` ? List zones here.

{
    "result": [
        {
            "id": "jdnjeid91829hbdejza092019398232",
            "type": "A",
            "name": "abc1.sinao.fr",
            "content": "90.124.128.119",
            "proxiable": true,
            "proxied": true,
            "ttl": 1,
            "locked": false,
            "zone_id": "1291dejnzd0921njndjende1921291d",
            "zone_name": "sinao.fr",
            "modified_on": "2020-03-20T19:02:13.943853Z",
            "created_on": "2020-03-20T19:02:13.943853Z",
            "meta": {
                "auto_added": false,
                "managed_by_apps": false,
                "managed_by_argo_tunnel": false
            }
        },
...

We need `id` for next step.

In the “Tests” tab, we must write a piece of code to pass their parameters to the next request :

var jsonData = pm.response.json();
if(jsonData.result.length) {
    
    // I want to delete the DNS for this IP address only for my case
    var ipToDelete = '90.124.128.119';
    
    // We are looking for the first occurrence of this IP in the content
    for(var i = 0; jsonData.result[i].content !== ipToDelete && i < jsonData.result.length-1; i++);
    
    // If an occurrence has been found, we prepare the next request
    if(i < jsonData.result.length-1) {
        // Save id into collectionVariables in Postman
        pm.collectionVariables.set("recordToDelete", jsonData.result[i].id);
        postman.setNextRequest("DNS Delete record");
   } else 
        // Stop bulk
        postman.setNextRequest(null); 
    
}

• Remove DNS entry

DELETE https://api.cloudflare.com/client/v4/zones/:zone_identifier/dns_records/:identifier

The result is just a success. So we push postman to execute the previous query to find the next occurrence to delete. And so on until there is no more result.