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

# Dars validate

<div class="x2mdx-ref-page x2mdx-ref-page--operation x2mdx-ref-page--manual-api" />

<div class="x2mdx-ref-hero">
  <p class="x2mdx-ref-eyebrow">JSON Ledger API</p>

  <h1 class="x2mdx-ref-title">Dars validate</h1>

  <div class="x2mdx-ref-badges">
    <span class="x2mdx-ref-badge x2mdx-ref-badge--protocol">OpenAPI</span>

    <span class="x2mdx-ref-badge x2mdx-ref-badge--added">Since 3.4</span>

    <span class="x2mdx-ref-badge x2mdx-ref-badge--changed">Changed 3.5</span>
  </div>
</div>

Validates the DAR and checks the upgrade compatibility of the DAR's packages with the set of the already vetted packages on the target vetting synchronizer. See ValidateDarFileRequest for details regarding the target vetting synchronizer. The operation has no effect on the state of the participant or the Canton ledger: the DAR payload and its packages are not persisted neither are the packages vetted.

## Protocol Details

<dl class="x2mdx-ref-meta-grid">
  <div class="x2mdx-ref-meta-item">
    <dt>Operation ID</dt>
    <dd>postV2DarsValidate</dd>
  </div>

  <div class="x2mdx-ref-meta-item">
    <dt>Authentication</dt>
    <dd>Bearer token</dd>
  </div>

  <div class="x2mdx-ref-meta-item">
    <dt>Published</dt>
    <dd>3.5</dd>
  </div>
</dl>

## Inputs

### Query parameters

<ParamField query="synchronizerId" type="string">
  *
</ParamField>

### Request body

<div class="x2mdx-ref-badges">
  <span class="x2mdx-ref-badge x2mdx-ref-badge--neutral">application/octet-stream</span>
</div>

<ParamField body="value" type="string" required>
  OpenAPI type: `string (binary)`.

  *
</ParamField>

## Outputs

### 200

### 400

<div class="x2mdx-ref-badges">
  <span class="x2mdx-ref-badge x2mdx-ref-badge--neutral">text/plain</span>
</div>

<ResponseField name="value" type="string" required>
  *
</ResponseField>

### default

<div class="x2mdx-ref-badges">
  <span class="x2mdx-ref-badge x2mdx-ref-badge--neutral">application/json</span>
</div>

<ResponseField name="code" type="string" required>
  *
</ResponseField>

<ResponseField name="cause" type="string" required>
  *
</ResponseField>

<ResponseField name="correlationId" type="string">
  *
</ResponseField>

<ResponseField name="traceId" type="string">
  *
</ResponseField>

<ResponseField name="context" type="Map_String" required>
  *
</ResponseField>

<ResponseField name="resources" type="Tuple2_String_String[]">
  *
</ResponseField>

<ResponseField name="errorCategory" type="integer (int32)" required>
  *
</ResponseField>

<ResponseField name="grpcCodeValue" type="integer (int32)">
  *
</ResponseField>

<ResponseField name="retryInfo" type="string">
  *
</ResponseField>

<ResponseField name="definiteAnswer" type="boolean">
  *
</ResponseField>

## History

<div class="x2mdx-ref-history" aria-label="Reference history">
  <div class="x2mdx-ref-history-event x2mdx-ref-history-event--changed">
    <div class="x2mdx-ref-history-event-head">
      <span class="x2mdx-ref-history-event-label">Changed</span>
      <code class="x2mdx-ref-history-event-version">3.5</code>
    </div>

    <p class="x2mdx-ref-history-event-detail">The POST /v2/dars/validate operation changed in this snapshot.</p>
  </div>

  <div class="x2mdx-ref-history-event x2mdx-ref-history-event--introduced">
    <div class="x2mdx-ref-history-event-head">
      <span class="x2mdx-ref-history-event-label">Introduced</span>
      <code class="x2mdx-ref-history-event-version">3.4</code>
    </div>
  </div>
</div>

<RequestExample>
  ```bash Request theme={null}
  curl --request POST \
    --url 'http://localhost:7575/v2/dars/validate' \
    --header 'Authorization: Bearer $TOKEN' \
    --header 'Content-Type: application/octet-stream' \
    --data-binary '@request.bin'
  ```
</RequestExample>

<ResponseExample>
  ```json default response theme={null}
  {
    "code": "string",
    "cause": "string",
    "correlationId": "string",
    "traceId": "string",
    "context": {},
    "resources": [
      [
        "string"
      ]
    ],
    "errorCategory": 0,
    "grpcCodeValue": 0,
    "retryInfo": "string",
    "definiteAnswer": false
  }
  ```
</ResponseExample>