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Title: FormData オブジェクトの使い方 - Web API | MDN

Open Graph Title: FormData オブジェクトの使い方 - Web API | MDN

Description: FormData オブジェクトは、フェッチまたは XMLHttpRequest API を使用して送信するためのキーと値のペアの集合をコンパイルできます。本来はフォームデータの送信に使用することを想定していましたが、キーのついたデータを伝送するためにフォームとは独立して使用することもできます。伝送されるデータは、フォームのエンコードタイプが multipart/form-data に設定されている場合に、submit() メソッドで送信する際に使用するデータと同じ形式です。

Open Graph Description: FormData オブジェクトは、フェッチまたは XMLHttpRequest API を使用して送信するためのキーと値のペアの集合をコンパイルできます。本来はフォームデータの送信に使用することを想定していましたが、キーのついたデータを伝送するためにフォームとは独立して使用することもできます。伝送されるデータは、フォームのエンコードタイプが multipart/form-data に設定されている場合に、submit() メソッドで送信する際に使用するデータと同じ形式です。

Opengraph URL: https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects

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Domain: developer.mozilla.org

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メインコンテンツへスキップhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#content
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FormData オブジェクトの使い方https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://github.com/orgs/mdn/discussions/739
https://developer.mozilla.org/de/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://developer.mozilla.org/es/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://developer.mozilla.org/fr/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://developer.mozilla.org/ru/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
コミュニティーについてもっと知り、仲間になるにはこちらから。https://developer.mozilla.org/ja/docs/MDN/Community/Contributing/Translated_content#アクティブなロケール
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
フェッチhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
XMLHttpRequesthttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest
submit()https://developer.mozilla.org/ja/docs/Web/API/HTMLFormElement/submit
ゼロから FormData オブジェクトを作成するhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#ゼロから_formdata_オブジェクトを作成する
HTML フォームから FormData オブジェクトを取り出すhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#html_フォームから_formdata_オブジェクトを取り出す
FormData オブジェクトを使用したファイルの送信https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#formdata_オブジェクトを使用したファイルの送信
formdata イベントの使用https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#formdata_イベントの使用
分かりましたかhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#分かりましたか
関連情報https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#関連情報
ゼロから FormData オブジェクトを作成するhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#ゼロから_formdata_オブジェクトを作成する
append()https://developer.mozilla.org/ja/docs/Web/API/FormData/append
FormData.append()https://developer.mozilla.org/ja/docs/Web/API/FormData/append
Blobhttps://developer.mozilla.org/ja/docs/Web/API/Blob
Filehttps://developer.mozilla.org/ja/docs/Web/API/File
fetch()https://developer.mozilla.org/ja/docs/Web/API/Window/fetch
Blobhttps://developer.mozilla.org/ja/docs/Web/API/Blob
Filehttps://developer.mozilla.org/ja/docs/Web/API/File
Blob() コンストラクターhttps://developer.mozilla.org/ja/docs/Web/API/Blob/Blob
HTML フォームから FormData オブジェクトを取り出すhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#html_フォームから_formdata_オブジェクトを取り出す
https://developer.mozilla.org/ja/docs/Web/HTML/Reference/Elements/form
FormData オブジェクトを使用したファイルの送信https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#formdata_オブジェクトを使用したファイルの送信
https://developer.mozilla.org/ja/docs/Web/HTML/Reference/Elements/input
https://developer.mozilla.org/ja/docs/Web/HTML/Reference/Elements/form
リクエストメソッドhttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Methods
XMLHttpRequesthttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest
フェッチ APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
Content-Typehttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Headers/Content-Type
Filehttps://developer.mozilla.org/ja/docs/Web/API/File
Blobhttps://developer.mozilla.org/ja/docs/Web/API/Blob
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
append()https://developer.mozilla.org/ja/docs/Web/API/FormData/append
formdata イベントの使用https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#formdata_イベントの使用
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
formdata イベントhttps://developer.mozilla.org/ja/docs/Web/API/HTMLFormElement/formdata_event
HTMLFormElementhttps://developer.mozilla.org/ja/docs/Web/API/HTMLFormElement
FormData()https://developer.mozilla.org/ja/docs/Web/API/FormData/FormData
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
submit イベントhttps://developer.mozilla.org/ja/docs/Web/API/HTMLFormElement/submit_event
preventDefaulthttps://developer.mozilla.org/ja/docs/Web/API/Event/preventDefault
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
FormDataEvent.formDatahttps://developer.mozilla.org/ja/docs/Web/API/FormDataEvent/formData
XMLHttpRequesthttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest
分かりましたかhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#分かりましたか
関連情報https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects#関連情報
フェッチ API の使用https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Fetch
HTMLFormElementhttps://developer.mozilla.org/ja/docs/Web/API/HTMLFormElement
Blobhttps://developer.mozilla.org/ja/docs/Web/API/Blob
型付き配列https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Typed_arrays
協力方法を知るhttps://developer.mozilla.org/ja/docs/MDN/Community/Getting_started
MDN の貢献者https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects/contributors.txt
GitHub でこのページを表示https://github.com/mdn/translated-content/blob/main/files/ja/web/api/xmlhttprequest_api/using_formdata_objects/index.md?plain=1
このコンテンツに関する問題を報告https://github.com/mdn/translated-content/issues/new?template=page-report-ja.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fja%2Fdocs%2FWeb%2FAPI%2FXMLHttpRequest_API%2FUsing_FormData_Objects&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60ja%2Fweb%2Fapi%2Fxmlhttprequest_api%2Fusing_formdata_objects%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fja%2Fdocs%2FWeb%2FAPI%2FXMLHttpRequest_API%2FUsing_FormData_Objects%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Ftranslated-content%2Fblob%2Fmain%2Ffiles%2Fja%2Fweb%2Fapi%2Fxmlhttprequest_api%2Fusing_formdata_objects%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Ftranslated-content%2Fcommit%2Fb1c95291a130f98a1164d2e8d6337e5b76e769e8%0A*+Document+last+modified%3A+2025-09-04T13%3A45%3A20.000Z%0A%0A%3C%2Fdetails%3E
XMLHttpRequest APIhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API
XMLHttpRequest の使い方https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_XMLHttpRequest
XMLHttpRequest における HTML の扱いhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/HTML_in_XMLHttpRequest
同期と非同期のリクエストhttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Synchronous_and_Asynchronous_Requests
バイナリーデータの送受信https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Sending_and_Receiving_Binary_Data
FormData オブジェクトの使い方https://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
FormDatahttps://developer.mozilla.org/ja/docs/Web/API/FormData
ProgressEventhttps://developer.mozilla.org/ja/docs/Web/API/ProgressEvent
XMLHttpRequesthttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest
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