package.json:
{
"dependencies": {
"express": "^4.19.2"
}
}
server.js:
const express = require("express");
const app = express();
app.get("/", (req, res) => {
throw new Error("foo", {
cause: new Error("bar"),
});
});
app.listen(3000, () => {
console.log("Server is running on port 3000");
});$ node server.js
Server is running on port 3000
Actual
The error cause is not displayed.
Error: foo
at /Users/oliver/Code/reduced-test-cases/express-error-cause/server.js:6:9
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/route.js:149:13)
at Route.dispatch (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/route.js:119:3)
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
at /Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/index.js:284:15
at Function.process_params (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/index.js:346:12)
at next (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/index.js:280:10)
at expressInit (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/middleware/init.js:40:5)
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
Expected
The error cause should be displayed, like it is for exceptions occurring outside of request handlers.
Error: foo
at /Users/oliver/Code/reduced-test-cases/express-error-cause/server.js:6:9
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
... 7 lines matching cause stack trace ...
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5) {
[cause]: Error: bar
at /Users/oliver/Code/reduced-test-cases/express-error-cause/server.js:7:12
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/route.js:149:13)
at Route.dispatch (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/route.js:119:3)
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
at /Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/index.js:284:15
at Function.process_params (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/index.js:346:12)
at next (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/index.js:280:10)
at expressInit (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/middleware/init.js:40:5)
at Layer.handle [as handle_request] (/Users/oliver/Code/reduced-test-cases/express-error-cause/node_modules/express/lib/router/layer.js:95:5)
}
package.json:{ "dependencies": { "express": "^4.19.2" } }server.js:$ curl "localhost:3000"Actual
The error
causeis not displayed.Expected
The error
causeshould be displayed, like it is for exceptions occurring outside of request handlers.