FIX Parser

Paste FIX messages — any delimiter, any log format

Paste FIX messages, log lines, or drop a file

Select a message to view details

Order Lifecycle

Click two messages to compare

Select a message to view details

Keyboard Shortcuts

Navigate messagesj / k

Expand / collapse (cards)Enter

Correlation viewc

Enter diff moded

Message flow diagramf

Copy selected messagey

Toggle Cards / Tablev

Search / filter/

Session statisticss

Print viewp

Close panel / cancelEsc

Show this help?

Tag lookupt

Tag Lookup

Session Statistics

What's New

Parsing

Smart FIX message extraction from any log format
Auto-detects delimiters: SOH, pipe, ^A
JSON structured log unwrap (e.g. Go zap, k8s logs)
Direction detection from log prefixes (IN/OUT, incoming/outgoing)
Direction inference from sender/target when no prefix
Full FIX data dictionary (683 tags with enum values)

Views

Cards view with expandable message details
Table view with side-by-side detail panel
Message flow sequence diagram
Session summary with per-session statistics

Analysis

ClOrdID correlation with order lifecycle modal
Round-trip latency measurement (NOS → first ExecReport)
Side-by-side message diff with field-level highlights
Checksum validation (Tag 10)
Body length validation (Tag 9)
Sequence gap detection per session (compact ranges)
Session statistics: latency (avg, p50, p95, p99), fill/reject rates, throughput, histogram
Message stats bar: type breakdown, send/recv, symbols
Reject/error detection with quick-jump banner

Search & Filter

Text search with space-delimited AND logic
Tag=value queries (e.g. 35=D)
Session filter dropdown
Tag reference lookup with searchable dictionary

Productivity

Keyboard shortcuts (j/k, c, d, v, y, /, t, f, s, Esc, ?)
Copy raw message, copy as formatted table
Copy all raw messages, export as CSV
Drag & drop log file support
Shareable URLs (base64 encoded in hash)
Paste history (last 10, stored in localStorage)
Print-friendly view

Display

Per-session time deltas between messages
Dark and light theme (persisted)
Offline support (PWA with service worker)
Responsive layout for mobile

Drop FIX log file here