This Serverless Framework Plugin allows to use plain JSON files in remote locations being parsed as environment variables in lambda, this unlocks ability to do integrations with anothers services and/or SSM ParameterStore to save many environment variables in a single parameters key as a JSON.

Run serverless plugin install in your Serverless project.

serverless plugin install -n serverless-remote-json-envs

• SSM ParameterStore
• S3

Define YAML configuration within custom block as:

SSM

[...]
[...]
custom:
  RemoteJSONEnvs:
    provider:
      aws:
        SSMParameterStore:
          - key: /my/secret/one
            secretJSONKey: 'secretos'
          - key: /my/secret/two
            secretJSONKey: 'secrets'
          - key: /my/secret/three
            secretJSONKey: 'secrets'
[...]
[...]

S3

[...]
[...]
custom:
  RemoteJSONEnvs:
    provider:
      aws:
        S3:
          - key: mybucketname/myenvsfile.json
            secretJSONKey: 'secretos'
[...]
[...]

You can add as many keys as you need

secretJSONKey: is the root JSON key where you secrets are stored inside your JSON file E.G:

{
    "secrets":{
        "ENVIRONTMENT":"lifeisgood",
        "MICROSERVICE_URL":"MICROSERVICE_URL.serverless.com",
        "RATE_LIMIT":"420"
        }
    }

Lambda envs will end up like this: