DefaultApplVerID (FIX tag 1137)

StringFIX 5.0 SP2

DefaultApplVerID (tag 1137) is a String field defined in FIX 5.0 SP2. It appears in 1 message type and is required in 1 of them.

At a glance

Tag: 1137
Name: DefaultApplVerID
Datatype: String
Dialects: FIX 5.0 SP2
Messages: 1

What the specification says

Specifies the FIX application version identifier. If DefaultApplVerID(1137) is not present, the default application level is assumed to be FIXLatest (value 10)

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

A real message using tag 1137

Logon · FIX 5.0 SP2

Tag	Field	Wire value	Meaning
8	BeginString	FIXT.1.1
9	BodyLength	81
35	MsgType	A	Logon Message
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
98	EncryptMethod	0	None
108	HeartBtInt	1
1137	DefaultApplVerID	9
10	CheckSum	055

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 5.0 SP2 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Where tag 1137 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	Requiredness	Where in the message
Logon	A	Required	directly on the message body

Wire format

Free-form text. Any byte except the SOH separator is legal, so values are not trimmed or case-folded on the wire. @boarteam/fix keeps the value as a string; format rules are checked by validate(), which reports validate/invalid-value rather than throwing.

Read tag 1137 in TypeScript

decode.tsts

import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix50sp2";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const field = message.fields[1137];field?.name;   // "DefaultApplVerID"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a string

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-fix50sp2

Try the decoder Source on GitHub