fixwire vs FIXParser
FIXParser is a capable commercial FIX library, but its free tier parses only: encoding, session management, and the FIX server are paid ($5K to $10K+/year). fixwire does all of it under MIT, for free, with zero dependencies, including both initiator and acceptor sessions.
$ npm install fixwire
| fixwire | FIXParser | |
|---|---|---|
| License | MIT (free, incl. commercial use) | Commercial / tiered |
| Price | Free | Free (parse-only) · Pro $5K+ · Enterprise $10K+ /yr |
| Open source | Yes | No |
| Registration to use | None | Free tier requires a license key |
| Parse FIX messages | ✓ | ✓ (free) |
| Encode FIX messages | ✓ | Pro (paid) |
| Session management (initiator) | ✓ | Pro (paid) |
| Acceptor / FIX server | ✓ | Pro (paid) |
| Transports | TCP, TLS, WebSocket | TCP, TLS, WebSocket |
| FIX versions | 4.2 / 4.4 / 5.0 (FIXT.1.1) | FIX 4.x / 5.x |
| Runtime dependencies | Zero | — |
| Interop-tested vs QuickFIX / quickfixgo / QuickFIX/J | ✓ (public) | — |
Fair is fair: FIXParser is a polished commercial product, and its Enterprise tier
bundles managed extras fixwire does not try to be, an analytics dashboard, anomaly
detection, a hosted MCP server, and commercial support. If you want a vendor-supported
product with those features and a support contract, FIXParser is worth evaluating.
Performance is not the deciding factor: fixwire parses a typical message in roughly
1.3 microseconds (run npm run bench yourself), which is in the same
single-digit-microsecond range FIXParser advertises. If you want a free, MIT-licensed
engine you can read, own, and ship without a license fee, choose fixwire.