diff --git a/apps/web/src/dashboard/query-builder.js b/apps/web/src/dashboard/query-builder.js
index 44354d0..9161475 100644
--- a/apps/web/src/dashboard/query-builder.js
+++ b/apps/web/src/dashboard/query-builder.js
@@ -205,7 +205,7 @@ class QueryBuilder {
             <span class="text-xs text-gray-500 font-mono">Query JSON</span>
             <button id="qb-copy" class="text-xs text-blue-400 hover:text-blue-300">Copy</button>
           </div>
-          <pre id="qb-preview" class="text-xs text-gray-300 font-mono whitespace-pre-wrap overflow-x-auto">${query ? escapeHtml(JSON.stringify(query, null, 2)) : '<span class="text-gray-600">No conditions set</span>'}</pre>
+          <pre id="qb-preview" class="text-xs text-gray-300 font-mono whitespace-pre-wrap overflow-x-auto">${query ? escapeHtml(formatQueryJson(query)) : '<span class="text-gray-600">No conditions set</span>'}</pre>
         </div>
       </div>
     `;
@@ -230,7 +230,7 @@ class QueryBuilder {
 
     this.container.querySelector('#qb-copy').addEventListener('click', () => {
       const q = this.getQuery();
-      navigator.clipboard.writeText(q ? JSON.stringify(q, null, 2) : '{}');
+      navigator.clipboard.writeText(q ? formatQueryJson(q) : '{}');
       const btn = this.container.querySelector('#qb-copy');
       btn.textContent = 'Copied!';
       setTimeout(() => { btn.textContent = 'Copy'; }, 1500);
@@ -326,7 +326,43 @@ class QueryBuilder {
     const q = this.getQuery();
     const preview = this.container.querySelector('#qb-preview');
     if (preview) {
-      preview.textContent = q ? JSON.stringify(q, null, 2) : 'No conditions set';
+      preview.textContent = q ? formatQueryJson(q) : 'No conditions set';
     }
   }
 }
+
+// Compact-but-readable JSON formatter. Inlines any subtree that fits on a single
+// line within MAX_INLINE chars; otherwise breaks across lines with 2-space indent.
+const MAX_INLINE = 60;
+
+function formatQueryJson(value, indent = 0) {
+  const inline = inlineForm(value);
+  if (inline.length + indent <= MAX_INLINE) return inline;
+  if (Array.isArray(value)) {
+    if (value.length === 0) return '[]';
+    const pad = ' '.repeat(indent + 2);
+    const close = ' '.repeat(indent);
+    const items = value.map(v => pad + formatQueryJson(v, indent + 2));
+    return '[\n' + items.join(',\n') + '\n' + close + ']';
+  }
+  if (value && typeof value === 'object') {
+    const entries = Object.entries(value);
+    if (entries.length === 0) return '{}';
+    const pad = ' '.repeat(indent + 2);
+    const close = ' '.repeat(indent);
+    const items = entries.map(([k, v]) => pad + JSON.stringify(k) + ': ' + formatQueryJson(v, indent + 2 + JSON.stringify(k).length + 2));
+    return '{\n' + items.join(',\n') + '\n' + close + '}';
+  }
+  return JSON.stringify(value);
+}
+
+function inlineForm(value) {
+  if (value === null || typeof value !== 'object') return JSON.stringify(value);
+  if (Array.isArray(value)) {
+    if (value.length === 0) return '[]';
+    return '[ ' + value.map(inlineForm).join(', ') + ' ]';
+  }
+  const entries = Object.entries(value);
+  if (entries.length === 0) return '{}';
+  return '{ ' + entries.map(([k, v]) => JSON.stringify(k) + ': ' + inlineForm(v)).join(', ') + ' }';
+}