TL;DR
Postman frequently crashes on startup, loses sync, and can corrupt collection data—issues well documented across developer forums. This guide explains root causes and offers actionable fixes for major problems: Fedora/Linux crashes, VS Code extension failures, and collection sync conflicts. Where only workarounds exist, Apidog is presented as an alternative without these core issues.
Apidog is a free, all-in-one API development platform. It uses local-first storage by default, eliminating cloud sync conflicts and keeping your collections intact across sessions. Try Apidog free, no credit card required.
Introduction
Postman is a mature tool, but that doesn't guarantee stability. The expansion of features like Flows, AI, monitoring, and governance has increased the chance of bugs. Developers often encounter crashes on specific Linux distributions, silent data loss from sync conflicts, and VS Code extension hangs.
Most problems have fixes—some are simple command-line changes, others require workflow adjustments. Some issues persist, and switching tools may be the best solution.
This guide breaks down each major issue, explains the cause, and provides the most direct solution.
Postman Crashes on Startup (Fedora and Linux)
Root cause:
Postman is an Electron app. On Fedora (and some other Linux distros), a conflict between Postman’s bundled Chromium sandbox and updated kernel seccomp rules causes the app to crash before loading. This is common after Fedora 37/38 updated their sandbox policies.
Typical terminal output:
[FATAL:zygote_host_impl_linux.cc] Check failed: sandbox status is kSandboxLinux
Short-term fix:
Disable the sandbox when launching Postman:
postman --no-sandbox
To make this persistent, edit /usr/share/applications/postman.desktop and append --no-sandbox to the Exec line.
Important: Disabling the sandbox reduces app security. This is reasonable for a development machine under your control, but not for shared or production systems.
Why Apidog avoids this:
Apidog’s Linux builds don’t rely on Chromium’s sandbox for core features and run without the --no-sandbox workaround on Fedora 38/39.
Postman VS Code Extension Crash
Root cause:
The Postman VS Code extension embeds its own Electron runtime, which can conflict with VS Code’s Electron version, especially after VS Code updates. This often causes the extension to freeze at “Loading workspace,” spike CPU, or crash VS Code.
Short-term fix:
- Open Extensions panel (
Ctrl+Shift+X). - Disable the Postman extension.
- Restart VS Code.
- Re-enable the extension.
If that fails, uninstall and reinstall:
code --uninstall-extension Postman.postman-for-vscode
code --install-extension Postman.postman-for-vscode
If the crash persists, check if VS Code updated more than one minor version. Rolling back VS Code and waiting for the extension to update can help.
Longer-term fix:
Use the Postman desktop app alongside VS Code instead of the extension for more reliable performance.
Why Apidog avoids this:
Apidog’s VS Code extension uses the official VS Code API and doesn't embed its own Electron process, preventing this class of version conflict.
Postman Sync Not Working
Root cause:
Sync failures usually fall into three categories:
- Auth token expiry: Token expires, sometimes without prompting re-auth.
- Workspace ID mismatch: New workspace IDs may not sync if added while the app is open.
- Network proxy interference: Corporate proxies doing SSL inspection can break sync due to Postman’s certificate pinning.
Fixes by category:
- For auth token expiry: Sign out and back in to refresh the token.
-
For workspace ID mismatch:
- Close Postman.
-
Clear the sync cache:
- macOS:
rm -rf ~/Library/Application\ Support/Postman/IndexedDB- Linux:
rm -rf ~/.config/Postman/IndexedDB- Windows:
%APPDATA%\Postman\IndexedDB Reopen Postman and let it re-sync.
-
For proxy interference:
- Add Postman to your proxy’s SSL inspection bypass list.
- Or, configure Postman’s proxy settings in Settings > Proxy.
Warning: Clearing IndexedDB forces a full re-sync. Backup collections to the cloud or export as JSON before proceeding.
Collection Sync Conflicts
Root cause:
Postman’s optimistic concurrency sync means:
- If two users edit a collection simultaneously or the same user edits on two machines without syncing, the last synced version wins.
- No merge or conflict dialog: silent overwrites can occur.
Short-term fix:
- Before edits: Export the collection as a JSON backup (right-click > Export).
- After edits: Export again after saving.
-
If overwritten:
- Go to the collection, open the three-dot menu, select “View changelog.”
- Restore the previous version.
Changelog access requires a paid Postman plan. Free plans offer no recovery after overwrite unless you exported a backup.
Why Apidog avoids this:
Apidog stores collections locally by default; cloud sync is opt-in. When using sync, explicit conflict resolution prompts let you choose the winning version—no silent overwrites.
Postman App is Slow or Freezing After Update
Root cause:
Postman’s Electron app loads large JavaScript bundles at startup. Updates can cause cache conflicts, resulting in long load times or freezes.
Fix:
Clear Postman’s cache:
- macOS:
rm -rf ~/Library/Application\ Support/Postman/Cache
- Linux:
rm -rf ~/.config/Postman/Cache
- Windows:
%APPDATA%\Postman\Cache
Restart Postman. The first launch after clearing will be slower as assets rebuild, but subsequent launches should be fast.
If slowness continues, check if your collections are very large; thousands of requests can cause UI lag in Postman.
Environment Variables Disappearing After Restart
Root cause:
Postman distinguishes between “initial value” (synced) and “current value” (local-only) for environment variables. Only the initial value is synced. If you set a current value and Postman crashes or you switch machines, current values are lost.
Fix:
- For variables that should persist and sync: set the “Initial value” in the editor.
- For sensitive variables (API keys): use “Current value” only and instruct teammates to set their own. Never store secrets in initial value, as it syncs to the cloud.
FAQ
Why does Postman crash on Fedora but not Ubuntu?
Fedora enforces stricter kernel security policies. Postman’s Chromium sandbox assumptions don't hold on Fedora, causing crashes, while Ubuntu’s defaults are more permissive.
Can I recover a collection overwritten by sync?
Paid Postman plans have changelogs for version restore. Free plans can only recover if you exported a backup beforehand.
Is Postman’s VS Code extension worth it?
For light use, yes. For complex or heavy usage, the desktop app is more stable; the extension is prone to version conflicts after VS Code updates.
Does clearing IndexedDB delete my collections?
Cloud-synced collections are safe—IndexedDB is just a local index. Collections that exist only locally and were never synced will be lost, so always export before clearing.
How does Apidog handle team collaboration differently?
Apidog stores data locally and only syncs when you explicitly share or publish to a team project. Conflicts are handled with prompts—no silent overwrites.
Can I use Postman offline?
Partially. The desktop app works offline for editing and sending requests, but cloud features (sync, monitors, shared environments) require connectivity.
Most Postman issues are fixable, but many solutions are workarounds for design choices unlikely to change. If troubleshooting Postman takes more time than API testing, consider trying Apidog as an alternative.
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