Logs and Debugging

Stream log events from your installed app to your command line to troubleshoot your app. You can see 5,000 logs or up to 7 days of log events.

Create logs

Use console.log(), console.info(), and console.error() in your server code to create logs. View them with devvit logs for installed apps, or add --verbose to include timestamps.

The following example creates a basic app with a menu action that creates a log when clicked.

devvit.json

{
  "$schema": "https://developers.reddit.com/schema/config-file.v1.json",
  "name": "app-name",

  "server": {
    "dir": "dist/server",
    "entry": "index.cjs"
  },
  "permissions": {
    "reddit": true
  },
  "menu": {
    "items": [
      {
        "label": "Create a log!",
        "location": "subreddit",
        "endpoint": "/internal/log-action",
        "forUserType": "moderator"
      }
    ]
  }
}

server/index.ts

router.post("/internal/log-action", async (_req, res): Promise<void> => {
  console.log("log-action");
  res.json({
    showToast: {
      text: "Log action",
      appearance: "success",
    },
  });
});

Stream logs

To stream logs for an installed app, open a terminal and navigate to your project directory and run:

$ devvit logs <my-subreddit>

You can also specify the app name to stream logs for from another folder.

$ devvit logs <my-subreddit> <app-name>

You should now see logs streaming onto your console:

=============================== streaming logs for my-app on my-subreddit ================================
[DEBUG] Dec 8 15:55:23 Action called!
[DEBUG] Dec 8 15:55:50 Action called!
[DEBUG] Dec 8 15:57:29 Action called!
[DEBUG] Dec 8 15:57:32 Action called!

To exit the streaming logger, enter CTRL + c.

Historical logs

You can view historical logs by using the --since=XX flag. You can use the following shorthand:

• Xs: show logs in the past X seconds
• Xm: show logs in the past X minutes
• Xh: show logs in the past X hours
• Xd: show logs in the past X days
• Xw: show logs in the past X weeks

The following example will show logs from my-app on my-subreddit in the past day.

$ devvit logs <my-subreddit> --since=1d

You will now see historical logs created by your app on this subreddit:

=============================== streaming logs for my-app on my-subreddit ================================
[DEBUG] Dec 8 15:55:23 Action called!
[DEBUG] Dec 8 15:55:50 Action called!
[DEBUG] Dec 8 15:57:29 Action called!
[DEBUG] Dec 8 15:57:32 Action called!

To exit the streaming logger, enter CTRL + c.

Playtest

While you are running playtest in a subreddit, you will also be streaming logs from that community in your command line.