日本語で

in Japanese

→ 日本語
phrase Uncommon #17,534
in Japanese Uses で to indicate the language used for speaking, writing, thinking, or communicating.
JA: この説明を日本語で読んでください。
EN: Please read this explanation in Japanese.

私は日本語で苦労している

I'm struggling with Japanese.

簡単な日本語で話して

Please speak in simple Japanese.

それを日本語でどういうのがわかりません

I don't know how to say that in Japanese.

日本語で話してはいけません

You must not speak Japanese.

しかしみんな日本語で書かれているじゃないですか

But they're all written in Japanese, aren't they?

テッドついに日本語で考えを伝えることができた

Ted was finally able to express his thoughts in Japanese.

連絡される日本語でも大丈夫です

If you contact us, Japanese is perfectly fine.

日本語で話してください

Please speak in Japanese.

連絡は日本語でも大丈夫です

You can contact me in Japanese as well.

日本語で書かれた最初の小説は何ですか

What was the first novel written in Japanese?