Validation & Error Handling
Validate incoming request data and return consistent, well-structured error responses in serverless APIs built with Workers and Deno.
Why Validate Input?
Never trust client input. A robust API validates every incoming payload before acting on it.
Validation prevents:
- Corrupt data entering your store
- Crashes from missing fields
- Security issues like injection
At the edge, validation also fails fast, saving CPU and downstream calls.
Parsing the Request Body
Most APIs accept JSON. Parse it safely, malformed JSON throws.
async function readJson(request) {
try {
return await request.json();
} catch {
return null;
}
}All lessons in this course
- Designing RESTful APIs
- Routing & Middleware
- Validation & Error Handling