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FIX Decoder

Visit the live site at

Screenshot of FIX Decoder

A convenient and powerful decoder for FIX messages.

All processing is done locally in your browser, so no one can snoop on your messages.

Unlike the most prominent online FIX message decoder, this version is open source so you can prove that your messages are safe. This version supports a wider range of message representations too, including multiple messages.

For example, you can paste directly from a QuickFIX log:

<20121206-12:04:56, FIX.4.2:MyComp->YourComp, outgoing> (8=FIX.4.2 9=189 35=AE 34=510 49=MyComp 52=20121206-12:04:56.898 56=YourComp 22=4 31=157.8 32=10 43=N 48=GB00B16GWD56 60=20121206-12:04:56.891 64=20121206 150=0 570=N 571=TRADE_ID_88871 828=0 918=GBX 10=028 )

<20121206-12:05:06, FIX.4.2:MyComp->YourComp, incoming> (8=FIX.4.2 9=119 35=AR 49=YourComp 56=MyComp 34=753 52=20121206-12:05:08 370=20121206-12:04:58.744 571=TRADE_ID_88871 150=0 939=0 10=106 )

Note the leading text is ignored, and that there are multiple messages. Also the non-printable SOH character (\001) is handled correctly.

Using pipe characters (|) as separators is also supported.

How to build

In order to build this project, you need to have 2 tools installed on your computer: yarn (package manager), and gulp (build system). Please find below the link to their respective documentation:

To download the dependancies, run on the repository's folder:

yarn install

Then to build the project, just type:


The files will be copied on the 'dist' directory.


This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see