Express.js routing with optional param?

I have two situations to get data from DB 1. To show normal data{{taskId}} 2. To edit data via posting{{taskId}}/?state={{app.state}} Both url have the same `{{taskId}}` just a little bit different with last phrase `?state={{app.state}}` I use Express routing as followed: app.get('/task/:taskId/(?state=:status(pending|cancel|confirmed|deleted))?',; But I dont know why it does not work ? For example error: Cannot GET /task/51d2c53f329b8e0000000001 when going to h**p://
Can you give a little more details on what you're seeing exactly? I assume you actually have two routes, one for each of the cases you need to support? Can you show both? Does one of them work?

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