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Confirmation (MsgType AK)

applicationFIX 4.4FIX 5.0 SP2

Confirmation is the FIX message with MsgType AK, defined in FIX 4.4 and FIX 5.0 SP2. It is an application-level message: it carries a business event rather than managing the session. Its body has 67 top-level members once the standard header and trailer are counted.

A real Confirmation

Confirmation · FIX 4.4
TagFieldWire valueMeaning
8BeginStringFIX.4.4
9BodyLength220
35MsgTypeAKConfirmation
49SenderCompIDBOARTEAM
56TargetCompIDCOUNTERPARTY
34MsgSeqNum2
52SendingTime20240101-12:00:00.000
664ConfirmIDEXAMPLE
666ConfirmTransType0New
773ConfirmType1Status
665ConfirmStatus1Received
60TransactTime20240101-12:00:00.000
75TradeDate20240101
80AllocQty1000000
54Side1Buy
862NoCapacities1 entry1repeating group
528OrderCapacityAAgency
863OrderCapacityQty1000000
79AllocAccountEXAMPLE
6AvgPx1.09215
381GrossTradeAmt125000.00
118NetMoney125000.00
10CheckSum011
Edit and decode it yourself

Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.

Open in the full decoder →

Generated from the FIX 4.4 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Message body — FIX 4.4

Components are listed by name and link to their own page rather than being expanded inline; repeating groups are expanded, including where they nest.

Message body — FIX 5.0 SP2

Components are listed by name and link to their own page rather than being expanded inline; repeating groups are expanded, including where they nest.

What changed between the dialects

The top-level structure is identical in both dialects.

Handle Confirmation in TypeScript

decode.tsts
import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";​const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);​if (message.msgType === "AK") {  message.name;            // "Confirmation"  // fields are keyed by tag; repeating groups live on message.groups}​// Problems come back as data, never as exceptions:issues;                    // FixIssue[]fix.validate(message);     // dictionary-level problems

Decode this in your own code

The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.

npm i @boarteam/fix @boarteam/fix-dict-fix44
Try the decoderSource on GitHub