SOPS (Secrets OPerationS): manage secrets. More information: https://github.com/mozilla/sops.
sops -e path/to/myfile.json > path/to/myfile.enc.json
stdout
:sops -d path/to/myfile.enc.json
sops -r path/to/myfile.enc.yaml
sops -d --input-type json path/to/myfile.enc.json
sops -d --extract '["an_array"][1]' path/to/myfile.enc.json
diff <(sops -d path/to/secret1.enc.yaml) <(sops -d path/to/secret2.enc.yaml)