# Versioned sites

Read up https://docusaurus.io/blog/2018/09/11/Towards-Docusaurus-2#versioning first for problems in v1's approach.

:::callout{intent="note"}
The versioned docs should normally be migrated correctly by the [migration CLI](/guides/migration-v2-migration-automated)
:::

## Migrate your `versioned_docs` front matter

Unlike v1, The Markdown header for each versioned doc is no longer altered by using `version-${version}-${original_id}` as the value for the actual ID field. See scenario below for better explanation.

For example, if you have a `docs/hello.md`.

```md
---
id: hello
title: Hello, World !
---

Hi, Endilie here :)
```

When you cut a new version 1.0.0, in Docusaurus v1, `website/versioned_docs/version-1.0.0/hello.md` looks like this:

```md
---
id: version-1.0.0-hello
title: Hello, World !
original_id: hello
---

Hi, Endilie here :)
```

In comparison, Docusaurus 2 `website/versioned_docs/version-1.0.0/hello.md` looks like this (exactly same as original)

```md
---
id: hello
title: Hello, World !
---

Hi, Endilie here :)
```

Since we're going for snapshot and allow people to move (and edit) docs easily inside version. The `id` front matter is no longer altered and will remain the same. Internally, it is set as `version-${version}/${id}`.

Essentially, here are the necessary changes in each versioned\_docs file:

```diff {2-3,5}
---
- id: version-1.0.0-hello
+ id: hello
title: Hello, World !
- original_id: hello
---
Hi, Endilie here :)
```

## Migrate your `versioned_sidebars`

- Refer to `versioned_docs` ID as `version-${version}/${id}` (v2) instead of `version-${version}-${original_id}` (v1).

Because in v1 there is a good chance someone created a new file with front matter ID `"version-${version}-${id}"` that can conflict with `versioned_docs` ID.

For example, Docusaurus 1 can't differentiate `docs/xxx.md`

```md
---
id: version-1.0.0-hello
---

Another content
```

vs `website/versioned_docs/version-1.0.0/hello.md`

```md
---
id: version-1.0.0-hello
title: Hello, World !
original_id: hello
---

Hi, Endilie here :)
```

Since we don't allow `/` in v1 & v2 for front matter, conflicts are less likely to occur.

So v1 users need to migrate their versioned\_sidebars file

Example `versioned_sidebars/version-1.0.0-sidebars.json`:

```diff {2-3,5-6,9-10}  title="versioned_sidebars/version-1.0.0-sidebars.json"
{
+ "version-1.0.0/docs": {
- "version-1.0.0-docs": {
    "Test": [
+    "version-1.0.0/foo/bar",
-    "version-1.0.0-foo/bar",
    ],
    "Guides": [
+    "version-1.0.0/hello",
-    "version-1.0.0-hello"
    ]
  }
}
```

## Populate your `versioned_sidebars` and `versioned_docs`

In v2, we use snapshot approach for documentation versioning. **Every versioned docs does not depends on other version**. It is possible to have `foo.md` in `version-1.0.0` but it doesn't exist in `version-1.2.0`. This is not possible in previous version due to Docusaurus v1 fallback functionality (https://v1.docusaurus.io/docs/en/versioning#fallback-functionality).

For example, if your `versions.json` looks like this in v1

```json title="versions.json"
["1.1.0", "1.0.0"]
```

Docusaurus v1 creates versioned docs **if and only if the doc content is different**. Your docs structure might look like this if the only doc changed from v1.0.0 to v1.1.0 is `hello.md`.

```bash
website
├── versioned_docs
│   ├── version-1.1.0
│   │   └── hello.md
│   └── version-1.0.0
│       ├── foo
│       │   └── bar.md
│       └── hello.md
├── versioned_sidebars
│   └── version-1.0.0-sidebars.json
```

In v2, you have to populate the missing `versioned_docs` and `versioned_sidebars` (with the right front matter and ID reference too).

```bash {3-5,12}
website
├── versioned_docs
│   ├── version-1.1.0
│   │   ├── foo
│   │   │   └── bar.md
│   │   └── hello.md
│   └── version-1.0.0
│       ├── foo
│       │   └── bar.md
│       └── hello.md
├── versioned_sidebars
│   ├── version-1.1.0-sidebars.json
│   └── version-1.0.0-sidebars.json
```

## Convert style attributes to style objects in MDX

Docusaurus 2 uses JSX for doc files. If you have any style attributes in your Docusaurus 1 docs, convert them to style objects, like this:

```diff
---
id: demo
title: Demo
---

## Section

hello world

- <pre style="background: black">zzz</pre>
+ <pre style={{background: 'black'}}>zzz</pre>
```

## Related pages

- [Automated migration](./migration-v2-migration-automated.md)
- [Manual migration](./migration-v2-migration-manual.md)
- [Overview](./migration-v2-migration-overview.md)
- [Translated sites](./migration-v2-migration-translated-sites.md)

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