EncodedTextLen (FIX tag 354)

LengthFIX 4.4FIX 4.2

EncodedTextLen (tag 354) is a Length field defined in FIX 4.4 and FIX 4.2. It appears in 71 message types, always optionally.

At a glance

Tag: 354
Name: EncodedTextLen
Datatype: Length (int)
Dialects: FIX 4.4 and FIX 4.2
Messages: 71

What the specification says

FIX 4.4

Byte length of encoded (non-ASCII characters) EncodedText (355) field.

FIX 4.2

Byte length of encoded (non-ASCII characters) EncodedText field.

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 354

NewOrderSingle · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	117
35	MsgType	D	Order – Single
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
11	ClOrdID	ORD-10042
54	Side	1	Buy
60	TransactTime	20240101-12:00:00.000
40	OrdType	1	Market
354	EncodedTextLen	7
10	CheckSum	007

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.

Where tag 354 appears

Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.

Message	MsgType	FIX 4.4	FIX 4.2	Where in the message
Advertisement	7	Conditional	Optional	directly on the message body
AllocationInstruction	J	Conditional	Optional	directly on the message body
AllocationInstructionAck	P	Conditional	Optional	directly on the message body
AllocationReport	AS	Conditional	—	directly on the message body
AllocationReportAck	AT	Conditional	—	directly on the message body
AssignmentReport	AW	Conditional	—	directly on the message body
BidRequest	k	Conditional	Optional	directly on the message body
BidResponse	l	Conditional	Optional	inside the BidCompRspGrp component
BusinessMessageReject	j	Conditional	Optional	directly on the message body
CollateralAssignment	AY	Conditional	—	directly on the message body
CollateralInquiry	BB	Conditional	—	directly on the message body
CollateralInquiryAck	BG	Conditional	—	directly on the message body
CollateralReport	BA	Conditional	—	directly on the message body
CollateralRequest	AX	Conditional	—	directly on the message body
CollateralResponse	AZ	Conditional	—	directly on the message body
Confirmation	AK	Conditional	—	directly on the message body
ConfirmationAck	AU	Conditional	—	directly on the message body
ConfirmationRequest	BH	Conditional	—	directly on the message body
CrossOrderCancelReplaceRequest	t	Conditional	—	inside the SideCrossOrdModGrp component
CrossOrderCancelRequest	u	Conditional	—	inside the SideCrossOrdCxlGrp component
DerivativeSecurityList	AA	Conditional	—	inside the RelSymDerivSecGrp component
DerivativeSecurityListRequest	z	Conditional	—	directly on the message body
DontKnowTrade	Q	Conditional	Optional	directly on the message body
Email	C	Conditional	Optional	inside the LinesOfTextGrp component
ExecutionReport	8	Conditional	Optional	directly on the message body
IOI	6	Conditional	Optional	directly on the message body
ListCancelRequest	K	Conditional	Optional	directly on the message body
ListExecute	L	Conditional	Optional	directly on the message body
ListStatus	N	Conditional	Optional	inside the OrdListStatGrp component
ListStatusRequest	M	Conditional	Optional	directly on the message body
ListStrikePrice	m	Optional	Optional	inside the UndInstrmtStrkPxGrp component
Logout	5	Conditional	Optional	directly on the message body
MarketDataIncrementalRefresh	X	Conditional	Optional	inside the MDIncGrp component
MarketDataRequestReject	Y	Conditional	Optional	directly on the message body
MarketDataSnapshotFullRefresh	W	Conditional	Optional	inside the MDFullGrp component
MassQuoteAcknowledgement	b	Conditional	—	directly on the message body
MultilegOrderCancelReplace	AC	Conditional	—	directly on the message body
NewOrderCross	s	Conditional	—	inside the SideCrossOrdModGrp component
NewOrderList	E	Conditional	Optional	inside the ListOrdGrp component
NewOrderMultileg	AB	Conditional	—	directly on the message body
NewOrderSingle	D	Conditional	Optional	directly on the message body
News	B	Conditional	Optional	inside the LinesOfTextGrp component
OrderCancelReject	9	Conditional	Optional	directly on the message body
OrderCancelReplaceRequest	G	Conditional	Optional	directly on the message body
OrderCancelRequest	F	Conditional	Optional	directly on the message body
OrderMassCancelReport	r	Conditional	—	directly on the message body
OrderMassCancelRequest	q	Conditional	—	directly on the message body
PositionMaintenanceReport	AM	Conditional	—	directly on the message body
PositionMaintenanceRequest	AL	Conditional	—	directly on the message body
PositionReport	AP	Conditional	—	directly on the message body
Quote	S	Conditional	—	directly on the message body
QuoteRequest	R	Conditional	—	directly on the message body
QuoteRequestReject	AG	Conditional	—	directly on the message body
QuoteResponse	AJ	Conditional	—	directly on the message body
QuoteStatusReport	AI	Conditional	—	directly on the message body
Reject	3	Conditional	Optional	directly on the message body
RequestForPositions	AN	Conditional	—	directly on the message body
RequestForPositionsAck	AO	Conditional	—	directly on the message body
SecurityDefinition	d	Conditional	Optional	directly on the message body
SecurityDefinitionRequest	c	Conditional	Optional	directly on the message body
SecurityList	y	Conditional	—	inside the SecListGrp component
SecurityListRequest	x	Conditional	—	directly on the message body
SecurityStatus	f	Conditional	—	directly on the message body
SecurityTypeRequest	v	Conditional	—	directly on the message body
SecurityTypes	w	Conditional	—	directly on the message body
SettlementInstructions	T	Conditional	—	directly on the message body
TradeCaptureReport	AE	Conditional	—	inside the TrdCapRptSideGrp component
TradeCaptureReportAck	AR	Conditional	—	directly on the message body
TradeCaptureReportRequest	AD	Conditional	—	directly on the message body
TradeCaptureReportRequestAck	AQ	Conditional	—	directly on the message body
TradingSessionStatus	h	Conditional	Optional	directly on the message body

Wire format

A byte count for the length-prefixed field that follows it. Count bytes, not characters — a multi-byte UTF-8 value makes the two differ. @boarteam/fix parses the value as a number and reports parse/invalid-int when it does not lex as one; the raw string is kept either way.

Read tag 354 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);const field = message.fields[354];field?.name;   // "EncodedTextLen"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a number

Other Length fields

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 decoder Source on GitHub