`@RequestBody`

See equivalent in the Reactive stack

You can use the @RequestBody annotation to have the request body read and deserialized into an Object through an HttpMessageConverter. The following example uses a @RequestBody argument:

Java
Kotlin

@PostMapping("/accounts")
public void handle(@RequestBody Account account) {
	// ...
}

@PostMapping("/accounts")
fun handle(@RequestBody account: Account) {
	// ...
}

You can use the Message Converters option of the MVC Config to configure or customize message conversion.

Form data should be read using @RequestParam, not with @RequestBody which can’t always be used reliably since in the Servlet API, request parameter access causes the request body to be parsed, and it can’t be read again.

You can use @RequestBody in combination with jakarta.validation.Valid or Spring’s @Validated annotation, both of which cause Standard Bean Validation to be applied. By default, validation errors cause a MethodArgumentNotValidException, which is turned into a 400 (BAD_REQUEST) response. Alternatively, you can handle validation errors locally within the controller through an Errors or BindingResult argument, as the following example shows:

Java
Kotlin

@PostMapping("/accounts")
public void handle(@Valid @RequestBody Account account, Errors errors) {
	// ...
}

@PostMapping("/accounts")
fun handle(@Valid @RequestBody account: Account, errors: Errors) {
	// ...
}

If method validation applies because other parameters have @Constraint annotations, then HandlerMethodValidationException is raised instead. For more details, see the section on Validation.