# Editor Tooling

Source: https://decapcms.org/docs/editor-tooling/ (updated 2026-09-08)


## Linting

If you want to lint your Markdown files as part of your development workflow through your code editor, pre-commit hooks, and/or CI, we recommend using the Remark ecosystem.

Since Decap CMS uses `remark` internally for Markdown processing, using it in your development workflow will help avoid formatting/style differences between files edited through Decap and files edited locally.

To start using it in your project, install both [`remark-cli`](https://github.com/remarkjs/remark/tree/main/packages/remark-cli) and [`remark-frontmatter`](https://github.com/remarkjs/remark-frontmatter):

```sh
npm install --save-dev remark-cli remark-frontmatter
```

Then, add the following lines to your `package.json`:

```json
{
  "scripts": {
    "remark:check": "remark .",
    "remark:write": "remark . --output"
  },
  "remarkConfig": {
    "plugins": ["remark-frontmatter"]
  }
}
```

Now, you can use `npm run remark:check` to lint your Markdown files and `npm run remark:write` to format them.

## Custom Formatters

To manage content with other file formats than the built-in ones, you can register a custom formatter:

```js
const JSON5 = require("json5");

CMS.registerCustomFormat("json5", "json5", {
  fromFile: (text) => JSON5.parse(text),
  toFile: (value) => JSON5.stringify(value, null, 2),
});
```

Then include `format: json5` in your collection configuration. See the [Collection docs](https://www.decapcms.org/docs/configuration-options/#collections) for more details.

You can also override the built-in formatters. For example, to change the YAML serialization method from [`yaml`](https://npmjs.com/package/yaml) to [`js-yaml`](https://npmjs.com/package/js-yaml):

```js
const jsYaml = require("js-yaml");

CMS.registerCustomFormat("yml", "yml", {
  fromFile: (text) => jsYaml.load(text),
  toFile: (value) => jsYaml.dump(value),
});
```