Error: Too many re-renders. React limits the number of renders to prevent an infinite loop. Inside useEffect

Question

I am getting Too many re-renders error while setting data in a hook after fetching data from an API. on line setCustomData(formData);

At first I thought it's because of rerendering and useEffect being called multiple times but I have inculdes the empty array for that so that useEffect renders only once.

So I am not sure what's going wrong here. I would really appreciate your help.

const [numOfApplications, setNumOfApplications] = useState(0);
const [customData, setCustomData] = useState();
React.useEffect(() => {
    if (props.user.attributes["custom:role"] !== "Parent") {
      const campusId = props.user.attributes["custom:campusId"];
      const orgId = props.user.attributes["custom:orgId"];
      fetchCampusDetails(orgId, campusId)
        .then((res) => {
          console.log("result for campus details");
          console.log(res.data.customData);
          const formData = JSON.parse(res.data.customData.formData);
          setCustomData(formData);
          getAllCampusAnalytics(campusId)
            .then((result) => {
              const data = result.data.classes.all;
              const numOfApps = data.total - data.Draft;
              setNumOfApplications(numOfApps);
            })
            .catch((err) => {
              console.log(err);
            });
        })
        .catch((err) => {
          console.log(err);
        });
    }
    if (props.user.attributes["custom:role"] === "Parent") {
      if (!localStorage.getItem("orgList"))
        getAllCampus().then((res: any) => {
          console.log(res);
          res.data.map(async (menu: any) => {
            const name = menu.orgName.replace(/\s/g, "_");
            const formDataUrl = JSON.parse(
              menu.campusList[0].customData.formData
            );
            const formData = await schoolForm(name, formDataUrl);
            if (cookie.type) {
              localStorage.setItem("type", cookie.type);
            } else localStorage.setItem("type", "1");
          });
          setOrganisationList(res.data);
          localStorage.setItem("orgList", JSON.stringify(res.data));
          if (
            cookie.school &&
            res.data.filter((org: any) => {
              if (org.orgName === cookie.school.replace(/_/g, " ")) return org;
              else return null;
            }).length === 0
          )
            removeCookie("school", {path: "/"});
        });
    }
  }, []);

Answer 1

Firstly you should move the api calls out into their own function and call the function from within useEffect.

The reason its re-rendering is probably to do with the parent. If the parent re-renders, so does the child unless you use memo or something like that. Difficult to say without seeing the parent code.