Client Error (4xx)

HTTP 400 — 400 Bad Request

The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, size too large, invalid request message framing). (Sunucu, istemciden gelen isteği hatalı sözdizimi, eksik parametreler veya geçersiz JSON gövdesi nedeniyle işleyemedi.)

Yaygın Nedenler / Common Causes

•Malformed JSON body payload syntax (e.g., unescaped quotes, trailing commas).
•Missing required query parameters or header values.
•Request header or cookie size exceeded server limit.

Spesifikasyon & Kategori

Status Code:400

Category:Client Error (4xx)

RFC Standard:RFC 9110 / HTTP/1.1 & HTTP/2

Nasıl Düzeltilir / Practical Code Solutions

Validate Request Schema with Zod / Joi

Ensure incoming request body conforms to expected types before processing.

const result = userSchema.safeParse(req.body);
if (!result.success) {
  return res.status(400).json({ errors: result.error.errors });
}

Diğer Popüler HTTP Durum Kodları

200 201 204 301 302 401 403 404 429 500 502 503

Frequently Asked Questions

Common Questions About HTTP 400 to RFC Standard

Everything you need to know regarding AST transformations, typing rules, and browser security.

The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, size too large, invalid request message framing). In Turkish: Sunucu, istemciden gelen isteği hatalı sözdizimi, eksik parametreler veya geçersiz JSON gövdesi nedeniyle işleyemedi.