> ## Documentation Index
> Fetch the complete documentation index at: https://tfts.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# tfts diff

> Show planned infrastructure changes

Preview the changes that will be made to your infrastructure.

## Usage

```bash theme={null}
npx tfts diff [stack] [options]
```

## Aliases

* `plan`

## Description

The `diff` command synthesizes your configuration and runs `terraform plan` to show what changes would be made to your infrastructure. If no stack is specified, it operates on all stacks.

## Options

| Option          | Type    | Description                            | Default         |
| --------------- | ------- | -------------------------------------- | --------------- |
| `--app`         | string  | Command to run the tfts app            | From cdktf.json |
| `--output`      | string  | Output directory                       | `cdktf.out`     |
| `--skipSynth`   | boolean | Skip synthesis step                    | `false`         |
| `--refreshOnly` | boolean | Only refresh state, no changes         | `false`         |
| `--target`      | string  | Target specific resources (repeatable) | -               |

## Examples

### Basic Usage

```bash theme={null}
npx tfts diff
```

### Specific Stack

```bash theme={null}
npx tfts diff production
```

### Skip Synthesis

Use when you've already run `tfts synth`:

```bash theme={null}
npx tfts diff --skipSynth
```

### Refresh Only

Only update state without planning changes:

```bash theme={null}
npx tfts diff --refreshOnly
```

### Target Specific Resources

```bash theme={null}
npx tfts diff --target google_compute_instance.web
npx tfts diff --target google_compute_instance.web --target google_compute_disk.data
```

## Output

The command shows Terraform's plan output, including:

* Resources to be created (`+`)
* Resources to be updated (`~`)
* Resources to be destroyed (`-`)
* Resource attributes that will change

## Automatic Initialization

If the stack hasn't been initialized, `tfts diff` automatically runs `terraform init` before planning.