WordPress能否存储JSON对象并通过REST API原样检索？

Absolutely, you can store raw JSON objects like [{name: 'hello', type: 'myself'}] in WordPress and retrieve them via the REST API without extra <pre>/<code> markup or escaped characters. Here are three practical approaches tailored to different use cases:

1. Use Custom Fields (Most Reliable) #

This is the cleanest method because it separates your JSON data from the main post content, avoiding any editor formatting issues.

• Step 1: Add the custom field
  When editing a post, enable the "Custom Fields" panel (check it in the "Screen Options" dropdown at the top right of the editor). Create a new field (e.g., raw_json_data) and paste your JSON directly into the value field. Pro tip: Fix any invalid JSON syntax first—standard JSON requires double quotes for keys/values, and no trailing commas like in your example.

• Step 2: Expose the field to the REST API
  By default, custom fields aren't included in REST responses. Add this code to your theme's functions.php or a custom plugin to register the field:

  add_action('rest_api_init', function() {
      register_rest_field('post', 'raw_json_data', [
          'get_callback' => function($post) {
              $json_value = get_post_meta($post['id'], 'raw_json_data', true);
              // Return parsed JSON object, or raw string if parsing fails
              return json_decode($json_value, true) ?: $json_value;
          },
          'schema' => [
              'description' => 'Raw JSON data associated with the post',
              'type' => 'object' // Use 'string' if you want to return the raw JSON text
          ]
      ]);
  });
  

  Now when you call /wp-json/wp/v2/posts/{post_id}, you'll see a raw_json_data field in the response with your clean JSON (either as a parsed object or raw string, depending on your preference).

2. Extract JSON from Code Blocks (If You Must Use the Editor) #

If you need to keep the JSON in the post content's code block, you can filter the REST API response to strip out the markup and unescape characters:

Add this snippet to your functions.php:

add_filter('rest_prepare_post', function($response, $post, $request) {
    $content = $post->post_content;
    // Match WordPress's default code block HTML structure
    preg_match('/<pre class="wp-block-code"><code>(.*?)<\/code><\/pre>/s', $content, $matches);
    
    if (!empty($matches[1])) {
        // Reverse HTML escaping and parse the JSON
        $clean_json = htmlspecialchars_decode($matches[1]);
        $response->data['extracted_json'] = json_decode($clean_json, true) ?: $clean_json;
    }
    
    return $response;
}, 10, 3);

After adding this, your REST response will include an extracted_json field with the raw JSON, free of extra markup. Note: This relies on WordPress's code block output staying consistent—if the block's HTML changes in a future update, you may need to adjust the regex.

3. Custom Post Type for JSON-Only Content #

If you're working with a lot of JSON data, create a dedicated custom post type to store entries:

add_action('init', function() {
    register_post_type('json_entries', [
        'public' => true,
        'show_in_rest' => true,
        'rest_base' => 'json-entries',
        'supports' => ['title'], // Skip the editor if you only need to store JSON in the content field
        'labels' => [
            'name' => 'JSON Entries',
            'singular_name' => 'JSON Entry'
        ]
    ]);
});

// Filter the REST response to return clean JSON
add_filter('rest_prepare_json_entries', function($response, $post) {
    $response->data['raw_json'] = json_decode($post->post_content, true) ?: $post->post_content;
    return $response;
}, 10, 2);

Create a new "JSON Entry" post, paste your JSON into the content field, and fetch it via /wp-json/wp/v2/json-entries/{entry_id}—the raw_json field will have your unmodified JSON.

Key Notes #

• Always validate your JSON syntax (use tools like JSONLint) to avoid parsing errors.
• The custom fields method is the most robust long-term, as it insulates your data from editor or block changes.

内容的提问来源于stack exchange，提问作者GWorking