Mobile APIs sit at one of the most misunderstood trust boundaries in modern systems.
Many backend teams assume the client is their mobile app.
In reality, the backend communicates with any client capable of reproducing valid API requests.
Once attackers understand your API protocol, they can replicate requests without using your official app.
The real problem is not missing encryption — it’s backend systems trusting the client to enforce rules.
Mobile apps enforce UX constraints.
Backends must enforce security.
That means validating:
- business rules on the server
- authorization for every resource
- request payload constraints
- rate limits and anomaly patterns
If the backend trusts client values, attackers can simply modify request payloads and bypass UI restrictions.
Mobile apps enforce UX.
APIs enforce security.
Read the full article on Medium:
https://medium.com/@vaibhav.shakya786/secure-coding-for-mobile-apis-what-most-backend-teams-miss-f19d6c71acb4
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