No longer maintained, there is an official Cloudflare importer tool to import existing resources into terraform.

quick'n dirty cloudflare to terraform importer for DNS records

(Only tested with A, CAA, CNAME, MX, TXT records so far)

build & run

Requires Go >= 1.11

$ git clone git@github.com:emgag/cloudflare-terraform-import.git
$ go get && make
$ export CF_API_EMAIL="user@example.org" 
$ export CF_API_KEY="..."
$ ./cti import example.org

• Copy contents of import.tf to your terraform config.
• Review
• Run import.sh to import records into state