// free discord bot

Add the crash log bot to your Discord

Someone posts a crash log in your support channel. Instead of reading a few thousand lines of stack trace, run /crashlog on it. The bot names the cause in plain English, lists the fixes and links the full guide. It runs the same rules as our free crash log analyzer.

Updated October 2026  ·  Forge, NeoForge, Fabric, Quilt  ·  Free

It asks for one permission, applications.commands, which lets it add its commands and nothing else. No bot user joins your server and it can’t read your channels.

How to use it

1. Attach the file. /crashlog file: and pick the crash report (the newest .txt in crash-reports) or logs/latest.log. Files up to 10 MB.
2. Or give a link. /crashlog link: with an mclo.gs link. The bot reads the raw log through mclo.gs’s API.
3. Or paste. /crashlog text: with the error lines, or run /crashlog on its own to get a paste box (up to 4,000 characters).
4. On someone else’s message. Right-click the message (long-press on mobile), then Apps → Analyze crash log. It reads the message’s .log or .txt attachment, its mclo.gs link, or the error text in it.

Add private: True to /crashlog and only you see the answer. Otherwise it’s posted in the channel, so the person who asked sees it too.

What the answer looks like

The answer never quotes your log. When the rules don’t recognise a crash, the bot says where to look and points to the web analyzer for a deeper read.

What it recognizes

Each answer links the full guide for the crash it found:

• Wrong Java version for the Minecraft version, mod loader or a mod
• Out of memory (Java heap space, Metaspace, native threads)
• Missing or wrong-version dependency mods
• Client-only mods on a server
• Mixin errors between mods
• Duplicate mods
• Mods made for another loader or Minecraft version
• Failed to bind to port
• EULA not accepted
• Watchdog crashes (a single server tick took too long)
• Corrupt chunks and region files

What happens to the logs

• The bot only sees what a command hands it: the file, link or text you give /crashlog, or the one message you run Analyze crash log on. It never reads your channels.
• Files are downloaded only from Discord’s own attachment servers, and links only through the mclo.gs API. The log is analyzed in memory on Cloudflare’s network and is not stored. For a very long log, only the first 200 KB and the last 300 KB are read.
• The answer never quotes your log. It shows the cause, the fixes, the Minecraft, loader and Java versions it detected, and any mod names the crash report itself suspects.
• By default the bot answers from our own rules, with no AI. If AI reads are switched on for the bot, a crash the rules can’t explain may get one, the same way as on the web analyzer: IP addresses, home-folder user names and tokens are removed first, and only a trimmed excerpt is sent to Anthropic’s API. Your Discord user ID is then used to count AI reads per hour, and that counter deletes itself after about an hour.
• Like every Discord app, the bot gets your user ID and the server and channel IDs with each command. We don’t keep them.

The full details are in our privacy policy.

Common questions