This content originally appeared on DEV Community and was authored by Aquib Sayyed
If you don't know what tags mean, good luck figuring that out.
2️⃣ Trade rejections lack visibility
A trade fails, but the error message is buried inside a log file.
Was it missing a required field? Did it fail compliance checks?
3️⃣ Sequence gaps & resets cause session issues
If sequence numbers aren't in sync, FIX sessions break.
Manually finding the last valid sequence number takes forever.
🛠️ How QuantScopeApp Helps
Instead of manually scanning through raw logs, you can upload them to QuantScopeApp and:
✅ View FIX messages in a readable format
✅ Search & filter messages (by order ID, message type, etc.)
✅ See sequence gaps, resets, and message flow stats
💡 Example Use Case: Debugging a Rejected Trade
Let's say a trade gets rejected, and you need to find out why. Instead of manually reading logs:
1️⃣ Upload your log file to QuantScopeApp
2️⃣ Filter by message type (ExecutionReport, NewOrderSingle, etc.)
3️⃣ Spot errors like missing fields, invalid tag values, or out-of-sequence messages
Boom. You now know why the trade failed without wasting hours in raw logs.
🚀 Why Open-Source?
Most FIX tools are closed-source, expensive, or overly complex.
QuantScopeApp is:
✔ Free & open-source (use it however you want)
✔ Lightweight (runs with Docker Compose)
✔ Simple – does what's needed, nothing extra
🔗 Try It Out
Would love feedback from anyone dealing with FIX logs! What's your biggest FIX debugging issue? Let's discuss. 🚀
This content originally appeared on DEV Community and was authored by Aquib Sayyed

Aquib Sayyed | Sciencx (2025-03-04T07:07:29+00:00) Debugging FIX Logs is a Pain. Here’s a Simple Tool to Help.. Retrieved from https://www.scien.cx/2025/03/04/debugging-fix-logs-is-a-pain-heres-a-simple-tool-to-help/
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