How to populate creator fields such as createdBy and updatedBy#

Enable the populateCreatorFields option in a content-type schema and create a route middleware to include createdBy and updatedBy fields in REST API responses.

The creator fields createdBy and updatedBy are removed from the REST API response by default. These 2 fields can be returned in the REST API by activating the populateCreatorFields parameter at the content-type level.

To add createdBy and updatedBy to the API response:

1. Open the content-type schema.json file.
2. Add "populateCreatorFields": true to the options object:

"options": {
    "draftAndPublish": true,
    "populateCreatorFields": true
  },

3. Save the schema.json.
4. Create a new route middleware either using the generate CLI or by manually creating a new file in ./src/api/[content-type-name]/middlewares/[your-middleware-name].js
5. Add the following piece of code, you can modify this example to suit your needs:

"use strict";

module.exports = (config, { strapi }) => {
  return async (ctx, next) => {
    if (!ctx.query.populate) {
      ctx.query.populate = ["createdBy", "updatedBy"];
    }

    await next();
  };
};

6. Modify your default route factory to enable this middleware on the specific routes you want this population to apply to and replacing the content-type/middleware name with yours:

"use strict";

const { createCoreRouter } = require("@strapi/strapi").factories;

module.exports = createCoreRouter("api::test.test", {
  config: {
    find: {
      middlewares: ["api::test.default-test-populate"],
    },
    findOne: {
      middlewares: ["api::test.default-test-populate"],
    },
  },
});

REST API requests with no populate parameter will include the createdBy or updatedBy fields by default.