Dart DevTools is a suite of debugging and performance tools for Dart and Flutter.
Using DevTools with a Flutter app
For details on using DevTools with a Flutter app, see the Flutter DevTools documentation.
Using DevTools with a command-line app
You can use DevTools to perform source-level debugging or to view general log and diagnostics information for a running command-line app.
1. Install DevTools
Use pub to install or update DevTools:
$ pub global activate devtools
2. Launch the DevTools server
Once you have DevTools, use the devtools command
to run the local web server for DevTools:
$ pub global run devtools
Serving DevTools at http://127.0.0.1.9100
3. Start the target app
Use the dart --observe command to execute the main file
for the Dart command-line app that you want to debug or observe:
$ cd path/to/dart/app
$ dart --observe main.dart
Observatory listening on http://127.0.0.1:8181/wYDP3x9mvbw=/
Note the “listening” URL. You’ll need this URL in the next step.
4. Open DevTools and connect to the target app
- Open Chrome browser window and navigate to
http://localhost:9100. - Paste the “listening” URL into the text field under Connect to a running app, and click the Connect button.
