What am I supposed to do to add a json recipe for my mod? Do I just create a json file with the correct syntax and drop it in my assets/modid/recipes? I don't understand how to use this.

 

I put this file (named "spsteelblock.json") in my assets/simplesteel/recipes,

{
	"type": "crafting_shaped",
	"pattern": [
		"###",
		"###",
		"###"
	],
	"key": {
		"#": {
			"item": "simplesteel:itemspingotsteel"
		}
	},
	"result": {
		"item": "simplesteel:spsteelblock"
	}
}

but this recipe doesn't show up at all in Minecraft. When I try crafting this, nothing happens.

 

 

I think you need to have the type as "minecraft:crafting_shaped".