apis.yaml

# yaml-language-server: $schema=https://www.membrane-api.io/v7.1.2.json
# JSON template with a variable
api:
  port: 2000
  method: GET
  flow:
    - request:
        - template:
            contentType: application/json
            pretty: yes
            src: |
              {
                "answer": ${params.answer?[0]}
              }
    - return:
        status: 200

---
# JSON input is converted to XML and directed to logger, the response is then converted back to JSON and returned.
api:
  port: 2000
  method: POST
  flow:
    - request:
        # Value of "city" field of the incoming JSON is inserted into XML
        - template:
            contentType: application/xml
            src: <city>${json.city}</city>
    # setProperty extracts the "city" from the XML.
    # The extracted value is placed inside a JSON template.
    # Note: Consider that the response flow is going from bottom to top.
    - response:
        - template:
            contentType: application/json
            src: |
              {
                "city": ${property.city.toString()}
              }
        # Is executed on the way back
        - setProperty:
            name: city
            value: '${/city}'
            language: xpath
  # Calls logger API below
  target:
    host: localhost
    port: 3000

---

api:
  name: logger
  port: 3000
  flow:
    - request:
        - log: {}
    - return:
        status: 200