ガイド
WebワークフローでよくあるBase64の失敗
連携不具合につながる典型的なBase64ミスを防ぐためのガイドです。
Base64は便利ですが、使い方を誤ると不具合の原因になります。よくある失敗を先に押さえましょう。
Mistake: treating Base64 as encryption
Base64 is reversible encoding, not data protection.
Never rely on it for confidentiality.
Mistake: encoding data unnecessarily
Many APIs already accept raw JSON or multipart uploads.
Extra encoding adds complexity and size overhead.
Mistake: ignoring format variants
Standard and URL-safe Base64 are different.
Using the wrong variant can break signatures or parsing.
- Match API spec exactly.
- Verify padding rules.
- Document expected variant.
Mistake: weak debugging hygiene
Copying raw decoded values into logs or chats can leak sensitive data.
Mask or truncate sensitive fields before sharing.
Typical mistakes appear in
- API requests.
- Auth token handling.
- Data URLs.
- Webhook payload troubleshooting.
Keep Base64 usage intentional
Use Base64 only where compatibility requires it, and validate decode/encode behavior in tests.