Replit
api
Request Validation Failed on Replit
API returns 400 Bad Request with validation errors. Request payload doesn't match expected format or constraints.
Request validation catches invalid or malformed data before processing.
Error Messages You Might See
400 Bad Request
validation failed
field validation error
Common Causes
- Missing required fields in request body
- Field type mismatch (string instead of number)
- Constraint violation (length, pattern, range)
- Unknown fields in request (if validation strict)
- Date format incorrect
How to Fix It
For Spring Boot, use @Valid with bean validation annotations (@NotNull, @Size, @Email). Check validation error messages in response. Use @JsonIgnoreProperties(ignoreUnknown=false) to reject unknown fields. Test request format with Postman. Return detailed validation error responses to client.
Real developers can help you.
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
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Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
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Developer
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I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How do I add validation?
Use annotations: @NotNull, @Size(min=1, max=100), @Email on fields
How do I return validation errors?
@ExceptionHandler catches MethodArgumentNotValidException and returns errors