Router module used

Correct HTTP methods

Appropriate status codes

Route separation

Router mounted on app

Input validation

Error handling middleware

JSON middleware present

package.json includes express

404 route handling

Consistent response format

Cache module created

Redis package used

Cache-aside read pattern

TTL on cache set

Cache invalidation on update

Cache invalidation on delete

Graceful degradation

Correct HTTP status codes preserved

Implementation notes present

Serialization handled

Router module structure preserved

Config from env vars

Routes separated

Messaging module created

Messaging package listed

Input validation on POST

Health endpoint present

Graceful messaging failure

Correct creation status code

app.js stays clean

DESIGN.md present

Express JSON middleware