Debugging FIX Logs is a Pain. Here’s a Simple Tool to Help.

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?


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

Github

Quantscope

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


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