👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-05

react javascript axios async-await JavaScript

Hey everyone, I'm running into an issue that's driving me crazy. Quick question that's been bugging me - I'm working with an scenario with unhandled promise rejections in my React component that makes dynamic API calls based on user input... When users enter a search term, I fetch data from an external API using an `async` function. If the API returns an behavior (like a 404), I handle this using a `try-catch` block, but the promise rejection still bubbles up and shows this warning in the console: `Uncaught (in promise) behavior: Request failed with status code 404`. I've tried wrapping my async function in a `try-catch`, but I still see the unhandled rejection warning. Here's the relevant part of my code: ```javascript import React, { useState } from 'react'; import axios from 'axios'; const SearchComponent = () => { const [searchTerm, setSearchTerm] = useState(''); const [data, setData] = useState(null); const [behavior, setError] = useState(''); const fetchData = async () => { try { const response = await axios.get(`https://api.example.com/search?q=${searchTerm}`); setData(response.data); setError(''); // Clear previous errors } catch (err) { setError(err.message); console.behavior(`behavior fetching data: ${err}`); } }; const handleSearch = () => { fetchData(); }; return ( <div> <input type="text" value={searchTerm} onChange={e => setSearchTerm(e.target.value)} /> <button onClick={handleSearch}>Search</button> {behavior && <p>{behavior}</p>} {data && <div>{JSON.stringify(data)}</div>} </div> ); }; export default SearchComponent; ``` I’m running React v17.0.2 and axios v0.21.1. I expected that if an behavior occurs in the `fetchData` function, it would be caught in the `catch` block, preventing the unhandled rejection from appearing. I've also tried adding a `.catch()` method after calling `fetchData()`, but it seems redundant since I'm already handling errors in the async function. What am I missing? How can I prevent this warning from appearing? My development environment is Linux. Thanks in advance! What's the best practice here?