Access GM_getValue outside of script

Question

Basically the question title. It would greatly benefit me. I want to be able to access GM_getValue outside of my userscript for debugging purposes, or, at the very least, the values and names themselves.

I am in Chrome on Windows 10.

Answer 1

• Latest Tampermonkey beta (and eventually normal Tampermonkey) displays the GM values in its dashboard script editor in Storage tab.

• Visual method: use Storage Area Explorer extension:

  1. Open the Tampermonkey dashboard page and invoke devtools by F12 or CtrlShifti

  2. In Storage Area Explorer panel scroll to the bottom to find the @uid# of your script by name, then find its data in @st# key with that UID:

     

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• Dumping in the console:

  One-time setup: add a new code snippet in devtools - Sources - Snippets subpanel and save it:

  function dumpGM_data(scriptName) {
      chrome.storage.local.get(null, data => {
          const UID = Object.keys(data).find(k => k.startsWith('@uid#') &&
                                                  data[k].value == scriptName);
          if (UID)
              console.log(data[UID.replace('@uid', '@st')].value.data);
      });
  }
  

  1. Open the Tampermonkey dashboard page and invoke devtools by F12 or CtrlShifti
  2. open and run that snippet: CtrlEnter - it'll be usable until you close the dashboard page

  3. invoke it in the console:

     dumpGM_data('SE Preview on hover')
     

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• Inspect/dump/edit the database file directly:

  Use any LevelDB tool you can find (or compile one yourself) on the ldb database file under Chrome user profile directory in Local Extension Settings/dhdgffkkebhmkfjojejmpbldmpobfkfo or Local Extension Settings/gcalenpjmijncebpfijmoaglllgpjagf for Tampermonkey beta.