Error: {"data": "foreach() argument must be of type array|object, string given", "message": "" in React Native

Question

i have to send this Array object to the API when i post the API data it shows me this error: Error: {"data": "foreach() argument must be of type array|object, string given", "message": ""

this is my code where i select postcodes

<Picker style={GlobalSS.picker}
                        
                        selectedValue={postcodes}
                        mode='dropdown'
                        dropdownIconRippleColor='orange'
                        dropdownIconColor='#FF8025'
                        onValueChange={(itemValue, itemIndex) =>
                            setPostcodess(itemValue)
                        }>

                        <Picker.Item color='grey'
                            label="Select Postal Code " value="" />
                        {data3.map(item => (
                            <Picker.Item label={item.text} value={item.id} />
                        ))}
                    </Picker>

this is the code where i fetch the postal codes from API

useEffect(() => {
        const fetchstateData = async () => {

            const resMr = await axios.post
                (`${urldemo}getskills`)
            setData1(resMr.data.result)

            const Org = await axios.post
                (`${urldemo}job/job-organization/index?token=${user_token}`)
            setJob_organization_id(Org.data.result.job_organization_id)

            const responsestate = await axios.post
                (`${urldemo}states`)
            setData2(responsestate.data.result)

            const responsepostal = await axios.post
                (`${urldemo}postal-codes`)
            setData3(responsepostal.data.result)

            
        }
        fetchstateData();
    }, []);

   


    const [data1, setData1] = useState([])
    const [data2, setData2] = useState([])
    const [data3, setData3] = useState([])

    const [job_organization_id, setJob_organization_id] = useState("")

    const [state_id, setStateId] = useState([]);
    const [postcodes, setPostcodess] = useState([]);
    const [skills, setSkills] = useState([]);

i want to send post codes in this form

"postcodes": {
        "postcode_0": {
            "postcode_id": "postcode-0001"
        },
        "postcode_1": {
            "postcode_id": "postcode-0002"
        }
    },

send Post code and other data here

let data = {
                address: address,
                job_organization_id: job_organization_id,
                customer_id: customer_id,
                job_title: job_title,
                job_description: job_description,
                max_salary: max_salary,
                min_salary: min_salary,
                job_experience_id: experiance,
                job_salary_type_id: salary,
                skills: skills,
                employment_type_id: jobMode,
                job_contact_number: job_contact_number,
                job_contact_email: job_contact_email,
                job_type_id: jobType,
                state_id: state_id,
                postcodes: postcodes,
                position_no: position_no,
                last_apply_date: last_apply_date,

            };
            fetch(`${urldemo}job/store?token=${user_token}`, {
                method: 'POST',
                body: JSON.stringify(data),
                headers: {
                    'Content-Type': "application/json",
                    "Accept": "application/json",
                },
            })
                .then((response) => response.json())
                .then((responseJson) => {

                    console.log("response.JSON ==>", responseJson);
                    showSuccess('Posted')

                    if (responseJson.status === 'success') {
                        console.log(
                            'Job Posted'
                        );
                        showSuccess('Successfully Posted')
                        setModalVisible(true)

                    } else {
                        showError("Not Posted ! something went wrong")
                    }
                })
                .catch((error) => {
                    console.error("Error Received ", error);
                });
        }