Add option to disable custom errors

README.md

@@ -151,6 +151,7 @@ const [err, user] = await fastify.to(
 #### Custom error handler
 This plugins also adds a custom error handler which hides the error message in case of `500` errors, instead it returns `Something went wrong`.<br>
 This is especially useful if you are using *async* routes, where every uncaught error will be sent back to the user *(but dot not worry, the original error message is logged as error in any case)*.
+If needed, it can be disabled by setting the option `errorHandler` to `false`.
 
 ## Contributing
 Do you feel there is some utility that *everyone can agree on* which is not present?<br>

index.js

@@ -36,14 +36,16 @@ function fastifySensible (fastify, opts, next) {
     })
   })
 
-  fastify.setErrorHandler(function (error, request, reply) {
-    if (reply.res.statusCode === 500) {
-      request.log.error(error)
-      reply.send(new Error('Something went wrong'))
-    } else {
-      reply.send(error)
-    }
-  })
+  if (opts.errorHandler !== false) {
+    fastify.setErrorHandler(function (error, request, reply) {
+      if (reply.res.statusCode === 500) {
+        request.log.error(error)
+        reply.send(new Error('Something went wrong'))
+      } else {
+        reply.send(error)
+      }
+    })
+  }
 
   function to (promise) {
     return promise.then(data => [null, data], err => [err, undefined])

test/errorHandler.test.js

@@ -28,6 +28,30 @@ test('The custom error handler should hide the error message for 500s', t => {
   })
 })
 
+test('The custom error handler can be disabled', t => {
+  t.plan(3)
+
+  const fastify = Fastify()
+  fastify.register(Sensible, { errorHandler: false })
+
+  fastify.get('/', (req, reply) => {
+    reply.send(new Error('kaboom'))
+  })
+
+  fastify.inject({
+    method: 'GET',
+    url: '/'
+  }, (err, res) => {
+    t.error(err)
+    t.strictEqual(res.statusCode, 500)
+    t.deepEqual(JSON.parse(res.payload), {
+      error: 'Internal Server Error',
+      message: 'kaboom',
+      statusCode: 500
+    })
+  })
+})
+
 test('The custom error handler should hide the error message for 500s (promise)', t => {
   t.plan(3)