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Expert Level · JSON Security Best Practices

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JSON Security Best Practices

Untrusted JSON can be dangerous. Validate with a schema, limit parsing depth, and never eval() JSON (use JSON.parse). Be wary of ReDoS in schema patterns. Whitelist allowed fields in APIs.

  • Always use JSON.parse(), never eval()
  • Validate with JSON Schema before trusting data
  • Limit object depth to prevent stack overflow
  • Sanitize output to prevent XSS when rendering
  • Use parameterized queries—never concatenate JSON into SQL