Issue in calling a 3rd party API via Axios in React JS

Problem Statement:- i wanted to have a respective post-office dropdown for the user entered pincode. In this way, i have used below mentioned api to call with axios. I got the required post office details in the dropdown but the problem is that the fetching of data never stops, i keep getting the extracted data from API continuously and it never stops until I close the server. Below is my mentioned code.

import React, { useState } from 'react'
import axios from "axios"

export default function Test() {
    const [inputValue, setInputValue] = React.useState("");
    const [districtName, setDistrictName] = React.useState("");
    const [stateName, setStateName] = React.useState("");
    const [dataArray, setDataArray] = React.useState("")
    const onChangeHandler = event => {
        setInputValue(event.target.value);
    };

    if (inputValue.length === 6) {
        console.log(inputValue)
        axios.get("https://api.postalpincode.in/pincode/" + inputValue).then(res => {
            var data = res.data;
            console.log("data: ", JSON.stringify(data))
            setDistrictName(data[0].PostOffice[0].District)
            setStateName(data[0].PostOffice[0].State)
            console.log("data_1: ", districtName + " " + stateName)
            var items = []
            data[0].PostOffice.forEach(element => {
                items.push(<option value={element.Name}>{element.Name}</option>)
                
            });
            setDataArray(items);
            console.log("items:",items);
        })
    }

    return (
        <div>
            <div>
                <label type="text" name="pincode">Pincode</label>
                <input
                    type="text"
                    name="pincode"
                    onChange={onChangeHandler}
                    value={inputValue}
                />
            </div>

            <div>

                <label type="text" name="district">District</label>
                <input
                    type="text"
                    name="district"
                    value={districtName}

                />
            </div>

            <div>
                <label type="text" name="state">State</label>
                <input
                    type="text"
                    name="state"
                    value={stateName}
                />
            </div>

            
                <select>
                    {dataArray}
                </select>

        </div>
    )
}