Safe Encoding Practices: A Developer Checklist
A practical checklist for encoding security: always encode output, never trust encoded input as safe, validate after decoding, and avoid double-encoding bugs.
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Tags: security, encoding, best-practices
Safe Encoding Practices: A Developer Checklist Encoding errors are among the most common sources of security vulnerabilities. The same developer who writes secure business logic often introduces XSS or injection vulnerabilities because they encoded data for the wrong context, used a library incorrectly, or skipped encoding in a "low-risk" code path. This checklist covers safe encoding practices by output context and language. Use it for code reviews and as a reference when building features that handle user input. HTML Context Encoding HTML Body Text [ ] User content rendered as visible page text uses (DOM API), template auto-escaping, or explicit HTML encoding [ ] The five characters are encoded: → , → , → , → , → [ ] is encoded before the others (to avoid double-encoding your own…
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