usebruno/bruno · error · Error

Collection is already in YML format

Error message

Collection is already in YML format

What it means

Error "Collection is already in YML format" thrown in usebruno/bruno.

Source

Thrown at packages/bruno-electron/src/ipc/yml-migration.js:231

      try {
        if (fs.existsSync(ymlFile)) {
          fs.unlinkSync(ymlFile);
        }
      } catch (_) {}
    }
    if (backupDir && !keepBackup) {
      await fsExtra.remove(backupDir).catch(() => {});
    }
    throw error;
  }
};

const migrateCollectionToYml = async ({ mainWindow, watcher, collectionPathname, collectionUid }) => {
  const brunoJsonPath = path.join(collectionPathname, 'bruno.json');
  let brunoConfig;
  try {
    if (getCollectionFormat(collectionPathname) === 'yml') {
      throw new Error('Collection is already in YML format');
    }
    brunoConfig = JSON.parse(fs.readFileSync(brunoJsonPath, 'utf8'));
  } catch (error) {
    try {
      await openCollection(mainWindow, watcher, collectionPathname);
    } catch (_) { }
    throw error;
  }
  // Unmount before touching disk: detach the watcher (for a file-cache v2 mount this also
  // stops the cache write-through riding on it, so migration's own writes/deletes aren't
  // double-processed as live changes) and clear every cache keyed by the deterministic
  // path-derived uid, so the post-migration reopen loads genuinely fresh state.
  if (watcher) {
    watcher.removeWatcher(collectionPathname, mainWindow, collectionUid);
  }
  try {
    await unmount(collectionUid);
  } catch (_) {}

View on GitHub (pinned to 9bdd81c7bd)

Solutions

1. No action needed; the collection already uses YML format.

When it happens

Trigger: Thrown at packages/bruno-electron/src/ipc/yml-migration.js:231 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of usebruno/bruno@9bdd81c7bd (2026-08-13). Data as JSON: /api/errors/d6cb1c6dd07cdf70. Report an issue: GitHub.