Unciv/docs/wiki/Civilization-related-JSON-files.md

• Beliefs.json
• Buildings.json
• Nations.json
• Policies.json
• Quests.json
• Religions.json
• Specialists.json
• Techs.json

Beliefs.json

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This file contains the beliefs that can be chosen for religions in your mod.

Each belief can have the following attributes:

attribute	Type	Optional or not	notes
name	String	Required	Name of the belief
type	String	Required	The type of the belief. Valid values are: "Pantheon" and "Follower". Later "Founder" will be added, but this has not been implemented yet
uniques	List of Strings	defaults to none	The unique abilities this belief adds to cities following it. May be chosen from the list of building uniques here, as well as the general uniques on that page
civilopediaText	List	Default empty	see civilopediaText chapter

Buildings.json

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This file should contain all the buildings and wonders you want to use in your mod.

Each building can have the following attributes:

attribute	Type	Optional or not	notes
name	String	required	Name of the building
cost	Integer (≥0)	defaults to 0	Amount of production required to build the building
food	Integer	defaults to 0	Food produced by the building
production	Integer	defaults to 0	Production produced by the building
gold	Integer	defaults to 0	etc.
happiness	Integer	defaults to 0
culture	Integer	defaults to 0
science	Integer	defaults to 0
faith	Integer	defaults to 0
maintenance	Integer (≥0)	defaults to 0	Maintenance cost of the building
isWonder	Boolean	defaults to false	Whether this building is a global wonder
isNationalWonder	Boolean	defaults to false	Whether this building is a national wonder
requiredBuilding	String	defaults to none	A building that has to be built before this building can be built. Must be in Buildings.json
requiredBuildingInAllCities	String	defaults to none	A building that has to be built in all cities before this building can be built. Must be in Buildings.json
cannotBeBuiltWith	String	defaults to none	The building [cannotBeBuiltWith] and this building cannot exist in the same city together. Should be in Buildings.json
providesFreeBuilding	String	defaults to none	When the building is built, [providesFreeBuilding] is also automatically added to the city
requiredTech	String	defaults to none	The tech that should be researched before this building may be built. Must be in Techs.json
requiredResource	String	defaults to none	The resource that is consumed when building this building. Must be in TileResources.json
requiredNearbyImprovedResources	List of Strings	defaults to none	The building can only be built if any of the resources in this list are within the borders of this city and have been improved. Each resource must be in TileResources.json
replaces	String	defaults to none	The name of a building that should be replaced by this building. Must be in Buildings.json
uniqueTo	String	defaults to none	If supplied, only the nation with this name can build this building. Must be in Nations.json
xpForNewUnits	Integer	defaults to 0	XP granted automatically to units built in this city
cityStrength	Integer	defaults to 0	Strength bonus the city in which this building is built receives
cityHealth	Integer	defaults to 0	Health bonus the city in which this building is built receives
hurryCostModifier	Integer	defaults to 0	When this building is bought using gold or faith, the price is increased by this much percent
quote	String	defaults to none	If this building is a (national) wonder, this string will be shown on the completion popup
uniques	List of Strings	defaults to none	List of unique abilities this building has. Most of these can be found here
replacementTextForUniques	String	defaults to none	If provided, this string will be shown instead of all of the uniques
percentStatBonus	Object	defaults to none	Percentual bonus for stats provided by the building. Valid keys are the names of stats (production, gold, science, etc.), valid values are Integers (≥0)
greatPersonPoints	Object	defaults to none	How many great person points for each type will be generated per turn. Valid keys are the names of great people (Great Scientist, Great Engineer, etc. .), valid values are Integers (≥0)
specialistSlots	Object	defaults to none	Specialist slots provided by this building. Valid keys are the names of specialists (as defined in Specialists.json), valid values are Integers, the amount of slots provided for this specialist
civilopediaText	List	Default empty	see civilopediaText chapter

Nations.json

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This file contains all the nations and city states, including Barbarians and Spectator.

Attribute	Type	Optional?	Notes
name	String	Required
leaderName	String	Default empty	Omit only for city states! If you want LeaderPortraits, the image file names must match exactly, including case.
style	String	Default empty	Modifier appended to pixel unit image names
adjective	String	Default empty	Currently unused
cityStateType	Enum	Default absent	Distinguishes Major Civilizations from City States (Cultured, Maritime, Mercantile, Militaristic)
startBias	List	Default empty	Zero or more of: terrainFilter or "Avoid [terrainFilter]". Two or more will be logically "and"-ed, and if the filters result in no choices, the entire attribute is ignored (e.g. "startBias": ["Snow","Tundra"] will never work).
preferredVictoryType	Enum	Default Neutral	Neutral, Cultural, Diplomatic, Domination or Scientific
startIntroPart1	String	Default empty	Introductory blurb shown to Player on game start...
startIntroPart2	String	Default empty	... second paragraph. NO "TBD"!!! Leave empty to skip that alert.
declaringWar	String	Default empty	another greeting
attacked	String	Default empty	another greeting
defeated	String	Default empty	another greeting
introduction	String	Default empty	another greeting
neutralHello	String	Default empty	another greeting
hateHello	String	Default empty	another greeting
tradeRequest	String	Default empty	another greeting
innerColor	3x Integer	Default black	R, G, B for outer ring of nation icon
outerColor	3x Integer	Required	R, G, B for inner circle of nation icon
uniqueName	String	Default empty	Decorative name for the special characteristic of this Nation
uniqueText	String	Default empty	Replacement text for "uniques". If empty, uniques are listed individually.
uniques	List	Default empty	Properties of the civilization - see here
cities	List	Default empty	City names used sequentially for newly founded cities.
civilopediaText	List	Default empty	see civilopediaText chapter

Policies.json

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This file lists the available social policies that can be "bought" with culture.

They are organized in 'branches', each branch has an 'opener', one or more 'member' policies, and a 'finisher'. Therefore this file is organized using two levels - branch and member policy. The properties of the 'opener' are defined with the branch level, while the 'finisher' has an entry on the member level which must be named as branch name + " Complete", case sensitive.

Each policy branch can have the following properties:

Attribute	Type	Optional?	Notes
name	String	Required
era	String	Required	Unlocking era as defined in Eras.json
uniques	List	Default empty	List of effects, see here
policies	List	Default empty	List of member policies

Each member policy can have the following properties:

Attribute	Type	Optional?	Notes
name	String	Required
row	Integer	Required	Placement in UI, each unit approximately half the icon size
column	Integer	Required	Placement in UI, each unit approximately half the icon size
requires	List	Default empty	List of prerequisite policy names
uniques	List	Default empty	List of effects, see here

Quests.json

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This file contains the Quests that may be given to major Civilizations by City States.

Attribute	Type	Optional?	Notes
name	String	Required	Unique identifier name of the quest, it is also shown
description	String	Required	Description of the quest shown to players
type	Enum	Default Individual	Individual or Global
influece	Float	Default 40	Influence reward gained on quest completion
duration	Integer	Default 0	Maximum number of turns to complete the quest, 0 if there's no turn limit
minimumCivs	Integer	Default 1	Minimum number of Civs needed to start the quest. It is meaningful only for type = Global

Religions.json

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This is just a list of Strings specifying all predefined Religion names. Corresponding icons must exist, that's all to it. After all, they're just containers for Beliefs.

Specialists.json

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This file should contain a list of all possible specialists that you want in your mod.

Each specialist can have the following attributes:

attribute	type	optional or not	notes
name	String	required	Name of the specialist
food	Integer	defaults to 0	Amount of food produced by this specialist
production	Integer	defaults to 0	Amount of production produced by this specialist
gold	Integer	defaults to 0	etc.
culture	Integer	defaults to 0
science	Integer	defaults to 0
faith	Integer	defaults to 0
color	List of 3 Integers	required	Color of the image for this specialist
greatPersonPoints	Object	defaults to none	Great person points generated by this specialist. Valid keys are the names of the great person(Great Scientist, Great Merachant, etc.), valid values are Integers (≥0)

Techs.json

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This file contains all the technologies. It is organized into an outer list of 'columns' which in turn contain one or more tech each.

Column structure

Attribute	Type	Optional?	Notes
columnNumber	Integer	Required	Horizontal placement in the Tech Tree.
era	String	Required	References Eras.json.
techCost	Integer	Required	Default cost of the techs in this column.
buildingCost	Integer	Required	Default cost of buildings requiring this tech.
wonderCost	Integer	Required	Default cost of wonders requiring this tech.
techs	List of Techs	Required	List of techs as follows - pay attention to the nesting of {} and [].

Tech structure

Attribute	Type	Optional?	Notes
name	String	Required	The name of this Technology.
row	Integer	Defaults to 0	Vertical placement in the Tech Tree, must be unique per column.
cost	Integer	Defaults to column techCost	The amount of science required to research this tech.
prerequisites	List	Default empty	A list of the names of techs that are prerequisites of this tech. Only direct prerequisites are necessary.
quote	String	Default empty	A nice story presented to the player when they research this tech.
uniques	List	Default empty	Properties granted by the tech - see here.
civilopediaText	List	Default empty	see civilopediaText chapter.