Bolt ui

Form Submission Not Working - Form Doesn't Send Data

Users fill out a form and click submit, but nothing happens. The form doesn't send data to the backend. No errors displayed.

Sometimes the page refreshes but data isn't saved.

Error Messages You Might See

Form submitting but data not saving Page refreshes but nothing happens API returns 400 Bad Request Form values are undefined
Form submitting but data not savingPage refreshes but nothing happensAPI returns 400 Bad RequestForm values are undefined

Common Causes

  1. Form doesn't prevent default submission with e.preventDefault()
  2. Form missing required name attributes on inputs
  3. Submit button has wrong type or missing type='submit'
  4. API endpoint URL is incorrect
  5. Form validation failing silently without user feedback

How to Fix It

Prevent default: const handleSubmit = (e) => { e.preventDefault(); // then handle }

Collect form data: const data = new FormData(e.target); or use useRef on inputs

Send to API: fetch('/api/submit', { method: 'POST', body: JSON.stringify(data) })

Handle errors: add .catch(err => setError(err.message))

Provide feedback: show success message or errors to user

Real developers can help you.

Bastien Labelle Bastien Labelle Full stack dev w/ 20+ years of experience Basel Issmail Basel Issmail ’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems. My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale. In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals. I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software. AUXLE AUXLE I am a Full Stack Developer experienced in building Websites, Web apps and Cross Platform Mobile Apps for Startups and Companies. Franck Plazanet Franck Plazanet I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth. Core Expertise: 🚀 Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement. 🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure. ☁️ Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs. 📈 Business Impact: Aligning tech strategy with P&L goals to drive $70k+ in monthly recurring revenue. I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity. Tejas Chokhawala Tejas Chokhawala Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript. Focused on performance, clean architecture and shipping fast. Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools. Simon A. Simon A. I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows. Kingsley Omage Kingsley Omage Fullstack software engineer passionate about AI Agents, blockchain, LLMs. Costea Adrian Costea Adrian Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system. Taufan Taufan I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms. Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact. MFox MFox Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.

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Frequently Asked Questions

Should I use form or fetch?

Use form for server-side rendering. Use fetch for client-side. In React, use fetch with form for control

How do I get form data?

1) FormData: new FormData(e.target), 2) Manual refs: useState + value/onChange, 3) Form library like react-hook-form

How do I show loading state while submitting?

useState isLoading, set to true on submit, false on response/error. Disable submit button while loading

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