Base44
security
Forms Accept Any Input Without Validation
Forms in your Base44 app accept and save any input without validation. Users can submit empty required fields, enter text in number fields, submit absurdly long strings, or inject HTML and scripts into text fields. This corrupts your data and can create security vulnerabilities.
Without validation, your database fills with garbage data: empty email fields, phone numbers with letters, negative quantities, and dates in the wrong format. Reports become unreliable, automated workflows break on bad data, and cleaning up the mess is time-consuming.
Worse, malicious users can inject scripts that execute when other users or admins view the submitted data, potentially stealing sessions or performing actions on their behalf.
Error Messages You Might See
Invalid data saved to database
Form submitted with empty required fields
Script executed when viewing submitted data
Number field contains non-numeric value
Common Causes
- No field constraints configured — Base44 form fields don't have required, min/max, or format rules set
- Client-side validation only — HTML5 validation attributes exist but can be bypassed by submitting directly to the API
- Text fields without length limits — Users can paste megabytes of text into a single field, bloating the database
- Number fields accepting strings — Price, quantity, and age fields store whatever string is submitted
- No sanitization of HTML content — Rich text or description fields accept raw HTML and JavaScript
How to Fix It
- Add required field rules — Mark all mandatory fields as required in both the form configuration and the data table schema
- Set field type constraints — Configure number fields to accept only numbers, email fields to validate email format, and date fields to accept only valid dates
- Add length limits — Set maximum character limits on text fields (e.g., 255 for names, 1000 for descriptions)
- Sanitize text input — Strip HTML tags from plain text fields and sanitize rich text fields to allow only safe HTML elements
- Add server-side validation rules — Configure validation at the data layer so it can't be bypassed by direct API calls
Real developers can help you.
Meïr Ankri
Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews.
Matt Butler
Software Engineer @ AWS
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
hanson1014
Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.
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.
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
My expertise lies in the critical backend infrastructure: the parts that must be fast, secure, and scalable. I thrive on high-pressure environments, such as when I had only three weeks to architect and launch an Ethereum redemption system with minimal prior crypto knowledge, turning it into a major revenue stream.
What I bring to your project:
Forensic Debugging: I don't just "patch" bugs; I use tools like Datadog and Explain Analyzers to map out bottlenecks and resolve root causes—like significantly reducing memory usage by optimizing complex DB joins.
Full-Stack Context: Deep experience in Node.js and React, ensuring backends play perfectly with mobile and web teams.
Sanity in the Age of AI: I bridge the gap between "best practices" and modern speed, ensuring your project isn't just built fast, but built to last.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Why is client-side validation not enough?
Anyone can bypass browser validation by editing the HTML, disabling JavaScript, or sending requests directly to the API. Server-side or data-layer validation is the only reliable way to ensure data integrity.
How do I clean up existing bad data?
Export your table data, clean it in a spreadsheet by removing empty rows and fixing formats, then re-import. Going forward, add validation rules to prevent bad data from being saved.