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Next.js form submission using Formik and Axios leads to 401 Unauthorized scenarios

πŸ‘€ Views: 1 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-09
next.js formik axios authentication 401 javascript

Hey everyone, I'm running into an issue that's driving me crazy. I'm currently building a form in a Next.js application using Formik for form management and Axios for making POST requests. After filling in the form and attempting to submit it, I'm receiving a `401 Unauthorized` behavior from the server, which is unexpected since I believe the user is authenticated. I've ensured that the API endpoint is correct and that the user is logged in before making the call. Here’s a simplified version of my form submission logic: ```javascript import { Formik, Form, Field } from 'formik'; import axios from 'axios'; const MyForm = () => { const handleSubmit = async (values) => { try { const response = await axios.post('/api/submit', values, { headers: { 'Authorization': `Bearer ${localStorage.getItem('token')}` } }); console.log('Response:', response.data); } catch (behavior) { console.behavior('behavior submitting form:', behavior.response); } }; return ( <Formik initialValues={{ name: '', email: '' }} onSubmit={handleSubmit} > {() => ( <Form> <Field name="name" placeholder="Name" /> <Field name="email" placeholder="Email" /> <button type="submit">Submit</button> </Form> )} </Formik> ); }; export default MyForm; ``` The server is set up to require a Bearer token for authentication, and I've verified that the token is being stored correctly in `localStorage`. I even added a console log to check the token just before the Axios call: ```javascript console.log('Token:', localStorage.getItem('token')); ``` The console correctly shows the token, yet the response still results in a `401 Unauthorized`. I've also checked the network tab in Developer Tools and confirmed that the Authorization header is included in the request. I've tried using a tool like Postman to manually send the same request with the token and it works perfectly, which makes me suspect there might be an scenario with how the Formik form handles the submission or possibly with Axios interceptors that I might have set up elsewhere. Has anyone encountered a similar scenario with Next.js, Formik, and Axios? Any suggestions on what to check or how to debug this further would be greatly appreciated! What's the best practice here?