How do you handle form submissions in Next.js with the Pages Router?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Next.js conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
By using client-side form handling or API routes for server-side handling.
// pages/contact.js
export default function Contact() {
const handleSubmit = async (e) => {
e.preventDefault();
const formData = new FormData(e.target);
const response = await fetch("/api/contact", {
method: "POST",
body: formData,
});
if (response.ok) {
alert("Form submitted successfully!");
} else {
alert("Error submitting form.");
}
};
return (
<form onSubmit={handleSubmit}>
<input name="name" type="text" placeholder="Name" required />
<input name="email" type="email" placeholder="Email" required />
<button type="submit">Submit</button>
</form>
);
}
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.