Apisix json body modify sample

body_modify.lua

local core = require("apisix.core")
local plugin_name = "json-transformer"

local schema = {
    type = "object",
    properties = {
    },
}

local _M = {
    version = 0.1,
    priority = 0,
    name = plugin_name,
    schema = schema,
}

function _M.check_schema(conf)
    return core.schema.check(schema, conf)
end

function _M.access(conf, ctx)
    
end

function _M.header_filter(conf, ctx)
    
end

function _M.body_filter(conf, ctx)
    
    local headers = core.response.header(ctx)
    if not headers or not headers["Content-Type"] or 
       not string.find(headers["Content-Type"]:lower(), "application/json") then
        return
    end

    local body = core.response.get_body()
    if not body then
        return
    end

    local data, err = core.json.decode(body)
    if not data then
        core.log.error("failed to decode JSON: ", err)
        return
    end

    if not data.results or not data.results[1] then
        return
    end

    local original = data.results[1]

    local transformed = {
        gender = original.gender,
        name = original.name,
        email = original.email,
        dob = original.dob,
        phone = original.phone,
        cell = original.cell
    }

    core.response.set_body(core.json.encode(transformed))
end

return _M

external_api_response.json

{
  "results": [
    {
      "gender": "male",
      "name": {
        "title": "Mr",
        "first": "Jacobo",
        "last": "Henríquez"
      },
      "location": {
        "street": {
          "number": 4518,
          "name": "Callejón Urbina"
        },
        "city": "Rioverde",
        "state": "Yucatan",
        "country": "Mexico",
        "postcode": 10096,
        "coordinates": {
          "latitude": "27.0536",
          "longitude": "-63.8377"
        },
        "timezone": {
          "offset": "-1:00",
          "description": "Azores, Cape Verde Islands"
        }
      },
      "email": "jacobo.henriquez@example.com",
      "login": {
        "uuid": "76674af0-f538-4a77-9adb-5e93ddb595f8",
        "username": "smallpanda412",
        "password": "mypass",
        "salt": "8toHQDD1",
        "md5": "c98f04cfd56f5cf37c119f6c8f9628bc",
        "sha1": "0ac9f954bc86a3b13fa33573b6bc84937c283391",
        "sha256": "142b6dc29542509e15d750432c2998c79d1379b58f4adb30490add4d460b44c4"
      },
      "dob": {
        "date": "1996-06-26T08:51:56.913Z",
        "age": 28
      },
      "registered": {
        "date": "2013-08-13T13:28:44.780Z",
        "age": 11
      },
      "phone": "(688) 735 3956",
      "cell": "(676) 961 6792",
      "id": {
        "name": "NSS",
        "value": "98 81 54 1105 7"
      },
      "picture": {
        "large": "https://randomuser.me/api/portraits/men/23.jpg",
        "medium": "https://randomuser.me/api/portraits/med/men/23.jpg",
        "thumbnail": "https://randomuser.me/api/portraits/thumb/men/23.jpg"
      },
      "nat": "MX"
    }
  ],
  "info": {
    "seed": "a57ce5a533f345d0",
    "results": 1,
    "page": 1,
    "version": "1.4"
  }
}

internal_system_response.json

{
  "gender": "male",
  "name": {
    "title": "Mr",
    "first": "Jacobo",
    "last": "Henríquez"
  },
  "email": "jacobo.henriquez@example.com",
  "dob": {
    "date": "1996-06-26T08:51:56.913Z",
    "age": 28
  },
  "phone": "(688) 735 3956",
  "cell": "(676) 961 6792"
}