javascript - How to show console.log() on Heroku? - Stack Overflow

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I've tried to debug my app by using console.log() inside Node.js.

However, I can never see them in heroku log no matter how many lines they show.

$ heroku logs -n 200

This didn't work for me.

Whenever I post something on Heroku server, the log only shows something like:

2018-09-10T02:14:12.731148+00:00 heroku[router]: at=info method=POST path="/users" host=obscure-journey-65698.herokuapp request_id=349a44e8-5fd7-46a2-aacb-75e51503109c fwd="73.67.204.217" dyno=web.1 connect=1ms service=355ms status=400 bytes=216 protocol=https

The console log never shows up! They do log the information I want when running npm start.

Thanks for any help.

I've tried to debug my app by using console.log() inside Node.js.

However, I can never see them in heroku log no matter how many lines they show.

$ heroku logs -n 200

This didn't work for me.

Whenever I post something on Heroku server, the log only shows something like:

2018-09-10T02:14:12.731148+00:00 heroku[router]: at=info method=POST path="/users" host=obscure-journey-65698.herokuapp. request_id=349a44e8-5fd7-46a2-aacb-75e51503109c fwd="73.67.204.217" dyno=web.1 connect=1ms service=355ms status=400 bytes=216 protocol=https

The console log never shows up! They do log the information I want when running npm start.

Thanks for any help.

• javascript
• node.js
• heroku
• console.log
• heroku-toolbelt

Share Improve this question Follow asked Sep 10, 2018 at 3:49 KeiKei 62122 gold badges1111 silver badges2626 bronze badges

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2 Answers 2

Sorted by: Reset to default 5

go to the heroku website and open your deployed app. go the more tab to the right corner and open logs. At log tab you will see the console outputs. you will see the console outputs of the file which is written in procfile or the file which is the first to execute. For example if have written in procfile that: web: node server.js then the server.js file will be the first one to execute. so if i have written console.log("output") in my server.js file then the output will be shown in logs of heroku which is in more tab as described above. Thanks

You can use an add-on called Papertrail. It has a free tier which should do the job.

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