The Command Syntax Mod highlights syntactical elements of a command in both the Command Block Interface and the chat. It also marks Syntax errors to make command debugging a lot easier for mapmakers.
Additionally, it adds Autocomplete to Command Blocks. It works exactly the same as in the chat window (TAB key).
Strings are colored orange, this way missing quotation marks can be quickly identified.
If numbers are cast to represent specific Java number types (e.g. 1b or 520s), they are highlighted green when correct and red if incorrect.
Selector arguments are colored dark blue to reveal any potential errors there.
Teddwa (The Fakemon in my avatar) belongs to ReallyDarkAndWindie and that is used with permission from him.
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I've updated this mod to Version 1.0.1,
in which a minor bug was fixed which made opening the chat using the SLASH key result in opening the chat as if using the T key.
In Version 1.1.0 I've added Autocomplete in Command Blocks - this feature was requested a lot of times. It works exactly like the chat autocomplete (Tab key).
CrushedPixel's Command Syntax Mod

The Command Syntax Mod highlights syntactical elements of a command in both the Command Block Interface and the chat. It also marks Syntax errors to make command debugging a lot easier for mapmakers.
Additionally, it adds Autocomplete to Command Blocks. It works exactly the same as in the chat window (TAB key).
Strings are colored orange, this way missing quotation marks can be quickly identified.
If numbers are cast to represent specific Java number types (e.g. 1b or 520s), they are highlighted green when correct and red if incorrect.
Selector arguments are colored dark blue to reveal any potential errors there.
Screenshots:
Detailed Showcase:
Download:
v1.1.0 (MC 1.8)
v1.0.2 (MC 1.8)
v1.0.0 (MC 1.8)
Support:
If you want to support me, you can do so on Patreon:
http://patreon.com/CrushedPixel
At a certain monthly amount I'll get rid of all AdFly links on my creations!
Alternatively, you can directly donate to my PayPal:
Thanks for keeping me motivated to create more mods and creations!
I've also created a JSON Book Generator, check it out here!
If you want a JSON Sign Generator, click here!
- CrushedPixel
Click on this spoiler to see mods and ideas that I support!
in which a minor bug was fixed which made opening the chat using the SLASH key result in opening the chat as if using the T key.
I found a bug though: when i press the command key it brings up a regular chat menu without the / at the start
This bug has been fixed in Version 1.0.2.
ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.
You're probably installing FML (Forge ModLoader) instead of Minecraftforge. This video shows how to properly install Forge to use with my mod:
Edit: Even after installing as you did, crashes.
God damn it. You should not use FML but Minecraftforge! This is a huge difference.