Masking data with Reactors

formula-config.json

{
  "name": "Mask Data - Example",
  "description": "Mask custom data with a Reactor",
  "type": "private",
  "code": "module.exports = async function (req) {\n  const mask = (str, mask, n = 1) => \n    ('' + str).slice(0, -n)\n      .replace(/./g, mask)\n      + ('' + str).slice(-n)\n\n  const { data } = req.args\n\n  return {\n    raw: mask(data)\n  }\n}",
  "configuration": [
  ],
  "request_parameters": [
    {
      "name": "data",
      "description": "All fields in this object will be masked",
      "type": "string",
      "optional": false
    }
  ]
}

formula.js

const formula = async function (req) {
  const mask = (str, mask, n = 1) => 
    ('' + str).slice(0, -n)
      .replace(/./g, mask)
      + ('' + str).slice(-n)

  const { data } = req.args

  return {
    raw: mask(data)
  }
}

usage.js

return axios
    .post(
      `https://api.basistheory.com/${reactorId}/react`,
      {
        data: "{{token-id | $.bankAccountOne}}"
      },
      {
        headers: {
          "BT-API-KEY": process.env.BASIS_THEORY_SERVER_APPLICATION
        },
      }
    )
    .then(async ({ data }) => {
      res.status(200).json({ data });
    })
    .catch((err) => {
      console.log(JSON.stringify(err));
    });

https://docs.basistheory.com/detokenization/#transformations-json-path