How can I get all items using createdBy filter?

System Information
  • Strapi Version: 4:19.0
  • Operating System: MacOs or Ubuntu
  • Database: Postgres
  • Node Version: 18.19.0
  • NPM Version: 10.2.3
  • Yarn Version: n/a


I am working with Strapi which is used to create articles that represent my content. Strapi admins can login and create an article which all works fine.
On my web frontend, I want readers/users to be able to see a list of articles that are published by a specific author but I am having trouble getting this data from the Strapi API.

Here is what I have done so far:

  1. I have extended the controller for the Article content type to return the createdBy fields. This works and allows me to get the author ID and name when doing a GET to my articles API (http://localhost:1337/api/articles?populate=*. Below you can see the extended controller.
module.exports = createCoreController('api::article.article', ({ strapi }) => ({
  async find(ctx) {
    const { data, meta } = await super.find(ctx);

    const query = strapi.db.query('api::article.article');

    await Promise.all( (item, index) => {
        const article = await query.findOne({
          where: {
          populate: ['createdBy'],

        data[index].attributes.createdBy = {
          firstname: article.createdBy.firstname,
          lastname: article.createdBy.lastname,

    return { data, meta };
  1. Created a new request in my frontend service that queries the Article api with a filter for createdBy. This appears to work for other attributes such as category, tags, title etc but it does not work for createdBy.

Here is the query URL format I and trying:

It returns this error in the response:

  "data": null,
  "error": {
    "status": 400,
    "name": "ValidationError",
    "message": "Invalid parameter createdBy",
    "details": {}

Is it possible for me to get all articles this way? I am trying to get articles that have only be createdBy user ID 2 in this example URL. I know that createdBy is exposed as I am able to see it in other GET requests to this article API.

Any help would be much appreciated.