Fetch API: Geli\u015fmi\u015f \u00d6zellikler ve Hata Y\u00f6netimi<\/p>\n
Merhaba! Fatih Soysal olarak, bu yaz\u0131da sizlerle JavaScript’in g\u00fc\u00e7l\u00fc API \u00e7a\u011fr\u0131 arac\u0131 olan Fetch API’nin geli\u015fmi\u015f \u00f6zelliklerini ve \u00f6zellikle hata y\u00f6netimini detayl\u0131 bir \u015fekilde inceleyece\u011fiz. Fetch API, modern web uygulamalar\u0131nda sunucuyla ileti\u015fim kurmak i\u00e7in temel bir ara\u00e7t\u0131r ve do\u011fru kullan\u0131ld\u0131\u011f\u0131nda, uygulamalar\u0131n\u0131z\u0131n g\u00fcvenilirli\u011fini ve performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<\/p>\n
\u00d6ncelikle, temel Fetch API kullan\u0131m\u0131n\u0131 hat\u0131rlayal\u0131m. Bir GET iste\u011fi g\u00f6ndermek i\u00e7in a\u015fa\u011f\u0131daki gibi basit bir kod kullanabiliriz:<\/p>\n
\nfetch('https:\/\/api.example.com\/data')\n .then(response => response.json())\n .then(data => console.log(data))\n .catch(error => console.error('Hata olu\u015ftu:', error));\n<\/code><\/pre>\nAncak, bu sadece temel bir kullan\u0131m. Ger\u00e7ek d\u00fcnya senaryolar\u0131nda, daha geli\u015fmi\u015f tekniklere ihtiya\u00e7 duyabiliriz. \u00d6rne\u011fin, POST istekleri, farkl\u0131 HTTP metodlar\u0131, ba\u015fl\u0131klar (headers) ve zaman a\u015f\u0131m\u0131 gibi konular\u0131 ele almal\u0131y\u0131z.<\/p>\n
Geli\u015fmi\u015f Fetch \u00d6zellikleri<\/h2>\nHTTP Metodlar\u0131 ve Ba\u015fl\u0131klar (Headers)<\/h3>\n
Fetch API, GET’ten daha fazlas\u0131n\u0131 sunar. POST, PUT, DELETE gibi farkl\u0131 HTTP metodlar\u0131n\u0131 kullanarak sunucuyla \u00e7e\u015fitli i\u015flemler ger\u00e7ekle\u015ftirebiliriz. Ayr\u0131ca, iste\u011finize \u00f6zel ba\u015fl\u0131klar ekleyerek sunucuya ek bilgiler g\u00f6nderebilirsiniz. \u00d6rne\u011fin, bir Content-Type ba\u015fl\u0131\u011f\u0131 kullanarak sunucuya g\u00f6nderdi\u011finiz verinin t\u00fcr\u00fcn\u00fc belirtebilirsiniz:<\/p>\n
\nfetch('https:\/\/api.example.com\/data', {\n method: 'POST',\n headers: {\n 'Content-Type': 'application\/json'\n },\n body: JSON.stringify({ key: 'value' })\n})\n .then(response => response.json())\n .then(data => console.log(data))\n .catch(error => console.error('Hata olu\u015ftu:', error));\n<\/code><\/pre>\nZaman A\u015f\u0131m\u0131 (Timeout)<\/h3>\n
Bazen, sunucu yan\u0131t vermeyebilir veya istek \u00e7ok uzun s\u00fcrebilir. Bu gibi durumlarda, zaman a\u015f\u0131m\u0131 mekanizmas\u0131 uygulaman\u0131z\u0131n kilitlenmesini \u00f6nler. Ancak, do\u011frudan Fetch API’da zaman a\u015f\u0131m\u0131 \u00f6zelli\u011fi bulunmamaktad\u0131r. Bu problemi a\u015fmak i\u00e7in AbortController kullanabiliriz:<\/p>\n
\nconst controller = new AbortController();\nconst timeoutId = setTimeout(() => controller.abort(), 5000); \/\/ 5 saniye zaman a\u015f\u0131m\u0131\n\nfetch('https:\/\/api.example.com\/data', { signal: controller.signal })\n .then(response => {\n clearTimeout(timeoutId); \/\/ Zaman a\u015f\u0131m\u0131 ba\u015far\u0131l\u0131ysa temizle\n return response.json();\n })\n .then(data => console.log(data))\n .catch(error => {\n if (error.name === 'AbortError') {\n console.error('\u0130stek zaman a\u015f\u0131m\u0131na u\u011frad\u0131');\n } else {\n console.error('Hata olu\u015ftu:', error);\n }\n });\n<\/code><\/pre>\nHata Y\u00f6netimi<\/h2>\n
Hata y\u00f6netimi, her uygulama i\u00e7in kritik \u00f6neme sahiptir. Fetch API’de hata y\u00f6netimi, catch blo\u011fu ile ger\u00e7ekle\u015ftirilir. Ancak, sadece bir catch blo\u011fu yeterli olmayabilir. Sunucudan gelen hata kodlar\u0131n\u0131 (\u00f6rne\u011fin, 404 Not Found, 500 Internal Server Error) kontrol ederek daha spesifik hata mesajlar\u0131 g\u00f6sterebilirsiniz:<\/p>\n
\nfetch('https:\/\/api.example.com\/data')\n .then(response => {\n if (!response.ok) {\n throw new Error(HTTP error! status: ${response.status});\n }\n return response.json();\n })\n .then(data => console.log(data))\n .catch(error => console.error('Hata olu\u015ftu:', error));\n<\/code><\/pre>\nBu \u015fekilde, sunucudan gelen hatalar\u0131 yakalay\u0131p kullan\u0131c\u0131ya daha anlaml\u0131 geri bildirimler sa\u011flayabiliriz. Ayr\u0131ca, farkl\u0131 hata t\u00fcrlerini yakalay\u0131p farkl\u0131 \u015fekilde i\u015fleyebilirsiniz. \u00d6rne\u011fin, network hatalar\u0131 i\u00e7in farkl\u0131 bir hata mesaj\u0131 g\u00f6stermeyi d\u00fc\u015f\u00fcnebilirsiniz. Ayr\u0131nt\u0131l\u0131 hata mesajlar\u0131, uygulaman\u0131z\u0131n debug i\u015flemlerini kolayla\u015ft\u0131r\u0131r.<\/p>\n
Async\/Await ile Fetch<\/h2>\n
Async\/await, Promise’leri daha temiz ve okunabilir bir \u015fekilde y\u00f6netmenizi sa\u011flar. Fetch API ile birlikte kullan\u0131ld\u0131\u011f\u0131nda, kodunuz daha d\u00fczenli ve anla\u015f\u0131l\u0131r hale gelir:<\/p>\n
\nasync function fetchData() {\n try {\n const response = await fetch('https:\/\/api.example.com\/data');\n if (!response.ok) {\n throw new Error(HTTP error! status: ${response.status});\n }\n const data = await response.json();\n console.log(data);\n } catch (error) {\n console.error('Hata olu\u015ftu:', error);\n }\n}\n\nfetchData();\n<\/code><\/pre>\nAsync\/await kullan\u0131m\u0131, hata y\u00f6netimini de basitle\u015ftirir. try…catch blo\u011fu, olas\u0131 t\u00fcm hatalar\u0131 tek bir yerde yakalamam\u0131z\u0131 sa\u011flar. Bu yakla\u015f\u0131m, kodun okunabilirli\u011fini ve bak\u0131m\u0131 kolayla\u015ft\u0131r\u0131r.<\/p>\n
Umar\u0131m bu makale, Fetch API’nin geli\u015fmi\u015f \u00f6zelliklerini ve hata y\u00f6netimini anlaman\u0131za yard\u0131mc\u0131 olmu\u015ftur. Daha fazla bilgi i\u00e7in fatihsoysal.com<\/a> veya MDN Fetch API d\u00f6k\u00fcmanlar\u0131n\u0131<\/a> inceleyebilirsiniz. Sorular\u0131n\u0131z ve \u00f6nerileriniz i\u00e7in ileti\u015fime ge\u00e7mekten \u00e7ekinmeyin!<\/p>\n#Etiketler: Fetch API, JavaScript, HTTP istekleri, hata y\u00f6netimi, async\/await, promise, geli\u015fmi\u015f \u00f6zellikler, network request, API \u00e7a\u011fr\u0131lar\u0131, POST, GET, PUT, DELETE, AbortController, HTTP error, response.ok, hata mesajlar\u0131, zaman a\u015f\u0131m\u0131, kod \u00f6rnekleri
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Fetch API, modern web uygulamalar\u0131nda sunucuyla ileti\u015fim kurmak i\u00e7in temel bir ara\u00e7t\u0131r ve do\u011fru kullan\u0131ld\u0131\u011f\u0131nda, uygulamalar\u0131n\u0131z\u0131n g\u00fcvenilirli\u011fini ve performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/fetch-api-gelismis-ozellikler-ve-hata-yonetimi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fetch API: Geli\u015fmi\u015f \u00d6zellikler ve Hata Y\u00f6netimi\" \/>\n<meta property=\"og:description\" content=\"Merhaba! 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