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MarketDataRequest (MsgType V)

applicationFIX 4.4FIX 4.2

MarketDataRequest is the FIX message with MsgType V, defined in FIX 4.4 and FIX 4.2. It is an application-level message: it carries a business event rather than managing the session. Its body has 15 top-level members once the standard header and trailer are counted.

MsgType is case-sensitive
V is MarketDataRequest, but v is a different message entirely — SecurityTypeRequest. Twenty-three FIX message types differ from another only by letter case.

A real MarketDataRequest

MarketDataRequest · FIX 4.4
TagFieldWire valueMeaning
8BeginStringFIX.4.4
9BodyLength114
35MsgTypeVMarket Data Request
49SenderCompIDBOARTEAM
56TargetCompIDCOUNTERPARTY
34MsgSeqNum2
52SendingTime20240101-12:00:00.000
262MDReqIDREQ-1
263SubscriptionRequestType0Snapshot
264MarketDepth1
267NoMDEntryTypes1 entry1repeating group
269MDEntryType0Bid
146NoRelatedSym1 entry1repeating group
55SymbolEUR/USD
10CheckSum009
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 4.2

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

Present in FIX 4.4 only (8)

tag 286, tag 546, tag 547, MDReqGrp, InstrmtMDReqGrp, TrdgSesGrp, tag 815, tag 812

Present in FIX 4.2 only (2)

group 267, group 146

Handle MarketDataRequest 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 === "V") {  message.name;            // "MarketDataRequest"  // 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