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Very lite but extendable mapping framework to create Mapnik ready maps with
OpenStreetMap data (and more).

For now, only Carto based projects are supported (with .mml or .yml config),
but in the future we hope to plug in MapCSS too.

Alpha version, installable only from source


Only the core needs:

  • project loading
  • local configuration management
  • tiles server for live feedback when coding
  • exports to common formats (Mapnik XML, PNG…)
  • hooks everywhere to make easy to extend it with plugins



Clone this repository with git clone,
go to the downloaded directory with cd kosmtik, and run:

npm install


Obtain changes from repository (e.g. git pull)

rm -rf node_modules && npm install

To reinstall all plugins:

node index.js plugins --reinstall


To get command line help, run:

node index.js -h

To run a Carto project (or .yml, .yaml):

node index.js serve <path/to/your/project.mml>

Then open your browser at

You may also want to install plugins. To see the list of available ones, type:

node index.js plugins --available

And then pick one and install it like this:

node index.js plugins --install pluginname

For example:

node index.js plugins --install kosmtik-map-compare [--install kosmtik-overlay…]

Local config

Because you often need to change the project config to match your
local env, for example to adapt the database connection credentials,
kosmtik comes with an internal plugin to manage that. You have two
options: with a json file named localconfig.json, or with a js module
name localconfig.js.

Place your localconfig.js or localconfig.json file in the same directory as your
carto project (or .yml, .yaml).

In both cases, the behaviour is the same, you create some rules to target
the configuration and changes the values. Those rules are started by the
keyword where, and you define which changes to apply using then
keyword. You can also filter the targeted objects by using the if clause.
See the examples below to get it working right now.

Example of a json file

        "where": "center",
        "then": [29.9377, -3.4216, 9]
        "where": "Layer",
        "if": {
            "Datasource.type": "postgis"
        "then": {
            "Datasource.dbname": "burundi",
            "Datasource.password": "",
            "Datasource.user": "ybon",
            "": ""
        "where": "Layer",
        "if": {
            "id": "hillshade"
        "then": {
            "Datasource.file": "/home/ybon/Code/maps/hdm/DEM/data/hillshade.vrt"

Example of a js module

exports.LocalConfig = function (localizer, project) {
    localizer.where('center').then([29.9377, -3.4216, 9]);
    localizer.where('Layer').if({'Datasource.type': 'postgis'}).then({
        "Datasource.dbname": "burundi",
        "Datasource.password": "",
        "Datasource.user": "ybon",
        "": ""
    // You can also do it in pure JS
    project.mml.bounds = [1, 2, 3, 4];

Known plugins

Run node index.js plugins --available to get an up to date list.

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