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Graph/input-validation-contract-mismatch

Pattern

Input Validation Mismatch

input-validation-contract-mismatch

Frontend form fields, query parameters, and backend parsers often disagree on expected formats (email/password shape, numeric vs string, date/SSN masking, filter parameter names), so validation rejects values or searches silently return nothing.

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Updated7/2/2026

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30 linked nodes

I had default values like this: `const preparedInitialData = { editing: false, name: "", email: "", password: "", gender: "",. Tension: breaks superRefine if empty.

A React Hook Form + Zod form with a ShadCN number input triggers controlled/uncontrolled state warnings and type mismatches when the number field lacks a proper default value (undefined or empty string). Using 0 as a default prevents the warning but forces an unwanted initial value that blocks placeholder behavior.

the values are not displayed, only when i start typing to search — in nextjs that implements a form which contains a dropdown coupled with search properties. Tension: when i click and dropdown selection appears the values are not displayed.

Submitting the form (clicking a submit button) does not trigger the onSubmit handler wrapped by react-hook-form's handleSubmit. The component shows no visible errors.

not let me type into any of the inputs — developing a simple form to send messages to my email with the help of `EmailJS`. Outcome: The issue you're experiencing is likely due to the way you're handling the `id` attribute in your `` and `` components and not correctly associating the `name` attribute with your form's state.

Custom shadcn components do not update state correctly, so the form logs unexpected values

it keeps converting the multi-valued search param 'fruits' (string[]) to comma separator — I am using React-Router `useNavigate()` to navigate to another webpage after selecting the column filters. Tension: making my query string look like this instead - `"type=fruit&filter=sour,sweet"` instead of using ampersand separator e.g. `"filter=sour&filter=sweet"`. Outcome: I tried many methods such as conversion and replace but it didnt work.

the input element gets unselected as soon as I enter even one character in the input — migrate it to TanStack Table. Tension: the table gets re-rendered as soon as I enter even one character so I cannot enter the entire input. Outcome: How to fix this issue?

such as the entry of a wrong password or wrong CSRF tokens. Tension: more an user error than a system error or caused by spam bots. Outcome: collect exception classes which are safe to ignore.

Sentry reports frequent "Non-Error promise rejection captured with value: Object Not Found Matching Id" events in a MERN app, but the error details are sparse and can’t be reliably reproduced locally.

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

when I try to insert an e-mail that does not match the pattern it still does get inserted into the database — I'm currently working on an api using fastapi and sqlmodel. Tension: I've read in some github issues that the regex parameter is not working properlly with pydantic. Outcome: You need instead to use a Pydantic-native validation method.

I keep getting the `422 Unprocessable Entity` error with the follwoing missing fields: — username: Annotated[str, Form()], password: Annotated[str, Form()]. Tension: Field required. Outcome: the error persists.

it doesn't trigger the unprocessable entity or bad request error — When I'm calling the POST endpoint with partial data or with keys I don't specify in my class. Tension: Even if the auto-created documentation tells me that there are some required fields.

while uploading the file from Browser. Tension: Aws error message was misleading, instead of asking us to send the security fields in the correct order it is telling us AccessKEY is not found. Outcome: Just changing the order of the form data in the frontend code worked for me.

"invalid input syntax for type uuid" — I'm building a Next.js application using Better Auth for authentication and Supabase as the database. Tension: Better Auth is generating UUIDs in a non-standard format (KZMw0N5rJhdi_i1JbWle6), but Supabase requires UUIDs in the standard format (50928f86-1dbc-4b4a-8377-c83c81051f7c). Outcome: This is causing user creation to fail.

Using react-input-mask inside a Next.js + Ant Design input component causes an underscore character (_) to appear at the end of the masked value, even when the mask is fully filled.

An attacker finds a vulnerability in one of your frontend-dependencies which he is able to exploit somehow — the backend stack is highly secure. Tension: malicious behavior which effects your highly secure backend-application. Outcome: keep your front end packages up-to-date.

Passwords entered in the browser appear in Firefox DevTools under the Network tab, leading to concern that credentials are exposed or insecure during login.

The form doesn't actually POST anywhere; it simply calls a function when the form is submitted. — I have built a form with fields for an email and password. Tension: Should I be concerned about bot attacks? Should I protect the submission in some way (reCAPTCHA, honeypot, etc.)? Outcome: yes - you should be worried.

Whether using Sequelize.Op.eq is enough to prevent SQL injection when saving user input to the database

MCP tool calls silently return empty content when arguments include any string value containing whitespace. Calling read_palm({name: "Alice"}) works; calling read_palm({name: "Alyssa Marie"}) returns content:[] with no error. Cause: a sdk-compat / normalizeArgs shim was added to work around an older SDK version that mis-deserialized whitespace strings — the shim drops fields containing whitespace before the schema validator sees them, then safeParse fails on the missing required field and the handler returns empty.

Validation errors set inside the onSave/submit handler are not reflected in formMethods.formState.errors when checked immediately, leading to incorrect conditional logic. The developer expects updated errors to be available in the same callback scope.

Using Mantine's authentication form, replacing Mantine's form with react-router-dom's `<Form>` results in `request.formData` being empty unless `name` attributes (e.g., `name="email"`) are added. When `Form` is used, Mantine form validation appears to stop working.

when I want to get the value in a text field or `DatePicker` it does not work fine — I am not able to get value in an input field from a custom component. Tension: The output is like below. Outcome: I suggest converting `DateFormat` to a utility function that returns the computed string value.

The email and password input fields are not stacking vertically and instead do not align as intended within the layout.

There are multilpe variables inside ValidateBankAccountRequest Object where I have to validate few objects that it should not be null. — inside ValidateBankAccountRequest Object. Tension: If one of them is null, throw an error.

When I submit the form there is no error thrown. — validate that the end date is greater than the start date. Tension: This is a form editing an entry submitted in a previous form. The startdate field has already been populated. Outcome: What am I missing?

integer underflow vulnerability in the search_impl function — When searching backward for a pattern within a string. Tension: the calculation of the remaining 'post' substring size uses a flawed formula. Outcome: This leads to memory corruption when the oversized substring is later accessed.

parent INSERT and the findings INSERT must be in the same transaction — existing public/staff Hono routes that previously wrote raw user input directly to Postgres. Outcome: route handlers blow up with "values is not a function" during tests.

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