diff --git a/expression-src/main/editor/lwc/miniEditor/miniEditor.css b/expression-src/main/editor/lwc/miniEditor/miniEditor.css
index ab5e907..aa75144 100644
--- a/expression-src/main/editor/lwc/miniEditor/miniEditor.css
+++ b/expression-src/main/editor/lwc/miniEditor/miniEditor.css
@@ -161,3 +161,12 @@ pre {
 .border-gray-200 {
     border-color: var(--lwc-colorBorder);
 }
+
+.compact-input {
+    font-size: 0.875rem;
+}
+
+.compact-input input {
+    height: 2.25rem;
+    font-size: 0.875rem;
+}
diff --git a/expression-src/main/editor/lwc/miniEditor/miniEditor.html b/expression-src/main/editor/lwc/miniEditor/miniEditor.html
index a98f984..34beac0 100644
--- a/expression-src/main/editor/lwc/miniEditor/miniEditor.html
+++ b/expression-src/main/editor/lwc/miniEditor/miniEditor.html
@@ -2,10 +2,31 @@
   <lightning-card>
     <div class="slds-grid slds-grid_align-spread slds-grid_vertical-align-center">
       <div class="slds-col slds-text-body_small slds-text-title_bold pl-2">{title}</div>
-      <div class="slds-col">
-        <lightning-button variant="brand-outline" label="Save"
-                          onclick={handleExpressionSaved}
-        ></lightning-button>
+      <div class="slds-col slds-grid slds-grid_align-end slds-gutters_x-small">
+        <template lwc:if={enableValidation}>
+          <div class="slds-col" style="width: 300px;">
+            <lightning-input type="text"
+                             value={recordId}
+                             onchange={handleRecordIdChange}
+                             placeholder="Record Id for validation (optional)"
+                             variant="label-hidden"
+                             class="compact-input"
+            ></lightning-input>
+          </div>
+        </template>
+        <template lwc:if={showValidationButton}>
+          <div class="slds-col">
+            <lightning-button variant="brand" label="Validate"
+                              onclick={handleValidate}
+                              icon-name="utility:play"
+            ></lightning-button>
+          </div>
+        </template>
+        <div class="slds-col">
+          <lightning-button variant="brand-outline" label="Save"
+                            onclick={handleExpressionSaved}
+          ></lightning-button>
+        </div>
       </div>
     </div>
     <div class="pt-1">
@@ -43,6 +64,7 @@
                          href="#"
                          data-name={value.name}
                          onmouseenter={handleMouseEnter}
+                         onclick={handleFunctionClick}
                       >
                         {value.name}
                       </a>
@@ -76,5 +98,36 @@
         </div>
       </div>
     </div>
+    <template lwc:if={showResults}>
+      <hr/>
+      <div class="pt-1">
+        <lightning-tabset>
+          <lightning-tab label="Result">
+            <template for:each={result.payload} for:item="payload">
+              <div key={payload.message}>
+                <lightning-badge label={payload.type}></lightning-badge>
+                <pre class={resultColor}>
+                  <lightning-formatted-rich-text value={payload.message}></lightning-formatted-rich-text>
+                </pre>
+                <hr/>
+              </div>
+            </template>
+          </lightning-tab>
+          <lightning-tab label="Diagnostics">
+            <ul>
+              <li><strong>CPU Time (ms):</strong> {diagnostics.cpuTime}</li>
+              <li><strong>DML Statements:</strong> {diagnostics.dmlStatements}</li>
+              <li><strong>Queries:</strong> {diagnostics.queries}</li>
+              <li><strong>Query Rows:</strong> {diagnostics.queryRows}</li>
+            </ul>
+          </lightning-tab>
+          <lightning-tab label="AST">
+            <pre class={resultColor}>
+              <lightning-formatted-rich-text value={ast}></lightning-formatted-rich-text>
+            </pre>
+          </lightning-tab>
+        </lightning-tabset>
+      </div>
+    </template>
   </lightning-card>
 </template>
diff --git a/expression-src/main/editor/lwc/miniEditor/miniEditor.js b/expression-src/main/editor/lwc/miniEditor/miniEditor.js
index dc79d3b..fd2fdd7 100644
--- a/expression-src/main/editor/lwc/miniEditor/miniEditor.js
+++ b/expression-src/main/editor/lwc/miniEditor/miniEditor.js
@@ -2,6 +2,8 @@ import { LightningElement, api } from 'lwc';
 import { getFunctionsAndOperators } from 'c/functions';
 import monaco from '@salesforce/resourceUrl/monaco';
 import getFunctions from "@salesforce/apex/PlaygroundController.getFunctionNames";
+import validate from '@salesforce/apex/PlaygroundController.validate';
+import { ShowToastEvent } from 'lightning/platformShowToastEvent';
 
 export default class MiniEditor extends LightningElement {
   @api
@@ -27,11 +29,26 @@ export default class MiniEditor extends LightningElement {
   @api
   defaultExpression = '';
 
+  @api
+  enableValidation = false;
+
+  @api
+  recordId = '';
+
   iframeUrl = `${monaco}/main.html`;
 
   categories = [];
   expression = '';
   lastHoveredFunction = null;
+  result = {};
+  diagnostics = {
+    cpuTime: "Unavailable",
+    dmlStatements: "Unavailable",
+    queries: "Unavailable",
+    queryRows: "Unavailable",
+  };
+  ast = "";
+  showResults = false;
 
   async connectedCallback() {
     this.categories = await getFunctionsAndOperators();
@@ -50,6 +67,14 @@ export default class MiniEditor extends LightningElement {
     return this.variant === 'editor';
   }
 
+  get showValidationButton() {
+    return this.enableValidation && (this.variant === 'editor' || this.variant === 'textarea');
+  }
+
+  get resultColor() {
+    return this.result.type === 'error' ? 'slds-text-color_error' : 'slds-text-color_default';
+  }
+
   async iframeLoaded() {
     const functionKeywords = await getFunctions();
     this.iframeWindow.postMessage({
@@ -132,4 +157,143 @@ export default class MiniEditor extends LightningElement {
       }
     }
   }
+
+  handleFunctionClick(event) {
+    event.preventDefault();
+    const functionName = event.target.dataset.name;
+    if (!functionName) {
+      return;
+    }
+
+    // Find the function to insert
+    for (const category of this.categories) {
+      const foundValue = category.values.find((value) => value.name === functionName);
+      if (foundValue) {
+        const functionToInsert = foundValue.autoCompleteValue || foundValue.name;
+
+        if (this.variant === 'editor') {
+          // For Monaco editor, send message to iframe
+          this.iframeWindow.postMessage({
+            name: 'append',
+            payload: functionToInsert
+          });
+        } else if (this.variant === 'textarea' || this.variant === 'input') {
+          // For textarea and input, insert at cursor position
+          const inputElement = this.template.querySelector(`${this.variant}[name="expression"]`);
+          if (inputElement) {
+            const start = inputElement.selectionStart;
+            const end = inputElement.selectionEnd;
+            const text = inputElement.value;
+            const before = text.substring(0, start);
+            const after = text.substring(end, text.length);
+
+            this.expression = before + functionToInsert + after;
+            inputElement.value = this.expression;
+
+            // Set cursor position after inserted text
+            setTimeout(() => {
+              const newPosition = start + functionToInsert.length;
+              inputElement.setSelectionRange(newPosition, newPosition);
+              inputElement.focus();
+            }, 0);
+          }
+        }
+        break;
+      }
+    }
+  }
+
+  handleRecordIdChange(event) {
+    this.recordId = event.target.value;
+  }
+
+  async handleValidate() {
+    if (!this.expression) {
+      return;
+    }
+
+    if (this.variant === 'editor') {
+      this.iframeWindow.postMessage({
+        name: 'clear_markers'
+      });
+    }
+
+    try {
+      const result = await validate({ expr: this.expression, recordId: this.recordId });
+      if (result.error) {
+        this.result = {
+          type: "error",
+          payload: [{ type: 'error', message: result.error.message }]
+        };
+
+        if (this.variant === 'editor') {
+          this.iframeWindow.postMessage({
+            name: 'evaluation_error',
+            payload: result.error
+          });
+        }
+      } else {
+        const payload = result.result ?? null;
+        const toPrint = result.toPrint.map((item) => item ?? null);
+        const allResults = [...toPrint, payload];
+        this.result = {
+          type: "success",
+          payload: allResults.map((current, i) => ({
+            type: i === allResults.length - 1 ? "result" : "printed",
+            message: this._syntaxHighlight(JSON.stringify(current, null, 4))
+          }))
+        };
+      }
+
+      this._setDiagnostics(result.diagnostics ?? {});
+      this.ast = result.ast ?
+        this._syntaxHighlight(JSON.stringify(result.ast, null, 4)) :
+        "";
+      this.showResults = true;
+    } catch (e) {
+      const event = new ShowToastEvent({
+        title: 'Unknown error',
+        variant: 'error',
+        message: e.body?.message || 'An unknown error occurred',
+      });
+      this.dispatchEvent(event);
+
+      this.result = {
+        type: "error",
+        payload: [{ type: 'error', message: 'An unknown error occurred while evaluating the expression.' }]
+      };
+      this.showResults = true;
+    }
+  }
+
+  _setDiagnostics(diagnostics) {
+    this.diagnostics = Object.keys(diagnostics).reduce((acc, key) => {
+      acc[key] = diagnostics[key] ?? "Unavailable";
+      return acc;
+    }, {
+      cpuTime: "Unavailable",
+      dmlStatements: "Unavailable",
+      queries: "Unavailable",
+      queryRows: "Unavailable",
+    });
+  }
+
+  _syntaxHighlight(json) {
+    json = json.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+    return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
+      let style = 'color: #c2410c;';
+      if (/^"/.test(match)) {
+        if (/:$/.test(match)) {
+          style = 'color: #b91c1c;';
+        } else {
+          style = 'color: #0f766e;';
+        }
+      } else if (/true|false/.test(match)) {
+        style = 'color: #4338ca;';
+      } else if (/null/.test(match)) {
+        style = 'color: #0e7490;';
+      }
+      return '<span style="' + style + '">' + match + '</span>';
+    });
+  }
 }