Refactor form components and improve API error handling

webui/src/components/BackendFormField.tsx

@@ -45,7 +45,6 @@ const BackendFormField: React.FC<BackendFormFieldProps> = ({ fieldKey, value, on
           <div className="grid gap-2">
             <Label htmlFor={fieldKey}>
               {config.label}
-              {config.required && <span className="text-red-500 ml-1">*</span>}
             </Label>
             <Input
               id={fieldKey}
@@ -72,7 +71,6 @@ const BackendFormField: React.FC<BackendFormFieldProps> = ({ fieldKey, value, on
           <div className="grid gap-2">
             <Label htmlFor={fieldKey}>
               {config.label}
-              {config.required && <span className="text-red-500 ml-1">*</span>}
             </Label>
             <Input
               id={fieldKey}
@@ -99,7 +97,6 @@ const BackendFormField: React.FC<BackendFormFieldProps> = ({ fieldKey, value, on
           <div className="grid gap-2">
             <Label htmlFor={fieldKey}>
               {config.label}
-              {config.required && <span className="text-red-500 ml-1">*</span>}
             </Label>
             <Input
               id={fieldKey}

webui/src/components/InstanceDialog.tsx

@@ -11,11 +11,13 @@ import {
   DialogTitle,
 } from "@/components/ui/dialog";
 import { BackendType, type CreateInstanceOptions, type Instance } from "@/types/instance";
-import { getBasicFields, getAdvancedFields, getBasicBackendFields, getAdvancedBackendFields } from "@/lib/zodFormUtils";
+import { getAdvancedFields, getAdvancedBackendFields } from "@/lib/zodFormUtils";
 import { ChevronDown, ChevronRight, Terminal } from "lucide-react";
-import ZodFormField from "@/components/ZodFormField";
-import BackendFormField from "@/components/BackendFormField";
 import ParseCommandDialog from "@/components/ParseCommandDialog";
+import AutoRestartConfiguration from "@/components/instance/AutoRestartConfiguration";
+import BasicInstanceFields from "@/components/instance/BasicInstanceFields";
+import BackendConfiguration from "@/components/instance/BackendConfiguration";
+import AdvancedInstanceFields from "@/components/instance/AdvancedInstanceFields";
 
 interface InstanceDialogProps {
   open: boolean;
@@ -39,9 +41,7 @@ const InstanceDialog: React.FC<InstanceDialogProps> = ({
   const [showParseDialog, setShowParseDialog] = useState(false);
 
   // Get field lists dynamically from the type
-  const basicFields = getBasicFields();
   const advancedFields = getAdvancedFields();
-  const basicBackendFields = getBasicBackendFields(formData.backend_type);
   const advancedBackendFields = getAdvancedBackendFields(formData.backend_type);
 
   // Reset form when dialog opens/closes or when instance changes
@@ -163,8 +163,6 @@ const InstanceDialog: React.FC<InstanceDialogProps> = ({
     setShowParseDialog(false);
   };
 
-  // Check if auto_restart is enabled
-  const isAutoRestartEnabled = formData.auto_restart === true;
 
   // Save button label logic
   let saveButtonLabel = "Create Instance";
@@ -212,70 +210,23 @@ const InstanceDialog: React.FC<InstanceDialogProps> = ({
             </div>
 
             {/* Auto Restart Configuration Section */}
-            <div className="space-y-4">
+            <AutoRestartConfiguration
-              <h3 className="text-lg font-medium">
+              formData={formData}
-                Auto Restart Configuration
-              </h3>
-
-              {/* Auto Restart Toggle */}
-              <ZodFormField
-                fieldKey="auto_restart"
-                value={formData.auto_restart}
               onChange={handleFieldChange}
             />
 
-              {/* Show restart options only when auto restart is enabled */}
+            {/* Basic Fields */}
-              {isAutoRestartEnabled && (
+            <BasicInstanceFields
-                <div className="ml-6 space-y-4 border-l-2 border-muted pl-4">
+              formData={formData}
-                  <ZodFormField
-                    fieldKey="max_restarts"
-                    value={formData.max_restarts}
               onChange={handleFieldChange}
             />
-                  <ZodFormField
-                    fieldKey="restart_delay"
-                    value={formData.restart_delay}
-                    onChange={handleFieldChange}
-                  />
-                </div>
-              )}
-            </div>
-
-            {/* Basic Fields - Automatically generated from type (excluding auto restart options) */}
-            <div className="space-y-4">
-              <h3 className="text-lg font-medium">Basic Configuration</h3>
-              {basicFields
-                .filter(
-                  (fieldKey) =>
-                    fieldKey !== "auto_restart" &&
-                    fieldKey !== "max_restarts" &&
-                    fieldKey !== "restart_delay" &&
-                    fieldKey !== "backend_options" // backend_options is handled separately
-                ) 
-                .map((fieldKey) => (
-                  <ZodFormField
-                    key={fieldKey}
-                    fieldKey={fieldKey}
-                    value={formData[fieldKey]}
-                    onChange={handleFieldChange}
-                  />
-                ))}
-            </div>
 
             {/* Backend Configuration Section */}
-            <div className="space-y-4">
+            <BackendConfiguration
-              <h3 className="text-lg font-medium">Backend Configuration</h3>
+              formData={formData}
-              
+              onBackendFieldChange={handleBackendFieldChange}
-              {/* Basic backend fields */}
+              showAdvanced={showAdvanced}
-              {basicBackendFields.map((fieldKey) => (
-                <BackendFormField
-                  key={fieldKey}
-                  fieldKey={fieldKey}
-                  value={(formData.backend_options as any)?.[fieldKey]}
-                  onChange={handleBackendFieldChange}
             />
-              ))}
-            </div>
 
             {/* Advanced Fields Toggle */}
             <div className="border-t pt-4">
@@ -314,54 +265,13 @@ const InstanceDialog: React.FC<InstanceDialogProps> = ({
               </div>
             </div>
 
-            {/* Advanced Fields - Automatically generated from type (excluding restart options) */}
+            {/* Advanced Fields */}
             {showAdvanced && (
               <div className="space-y-4 pl-6 border-l-2 border-muted">
-                {/* Advanced instance fields */}
+                <AdvancedInstanceFields
-                {advancedFields
+                  formData={formData}
-                  .filter(
-                    (fieldKey) =>
-                      !["max_restarts", "restart_delay", "backend_options"].includes(
-                        fieldKey as string
-                      )
-                  ).length > 0 && (
-                  <div className="space-y-4">
-                    <h4 className="text-md font-medium">Advanced Instance Configuration</h4>
-                    {advancedFields
-                      .filter(
-                        (fieldKey) =>
-                          !["max_restarts", "restart_delay", "backend_options"].includes(
-                            fieldKey as string
-                          )
-                      )
-                      .sort()
-                      .map((fieldKey) => (
-                        <ZodFormField
-                          key={fieldKey}
-                          fieldKey={fieldKey}
-                          value={fieldKey === 'backend_options' ? undefined : formData[fieldKey]}
                   onChange={handleFieldChange}
                 />
-                      ))}
-                  </div>
-                )}
-
-                {/* Advanced backend fields */}
-                {advancedBackendFields.length > 0 && (
-                  <div className="space-y-4">
-                    <h4 className="text-md font-medium">Advanced Backend Configuration</h4>
-                    {advancedBackendFields
-                      .sort()
-                      .map((fieldKey) => (
-                        <BackendFormField
-                          key={fieldKey}
-                          fieldKey={fieldKey}
-                          value={(formData.backend_options as any)?.[fieldKey]}
-                          onChange={handleBackendFieldChange}
-                        />
-                      ))}
-                  </div>
-                )}
               </div>
             )}
           </div>

webui/src/components/ParseCommandDialog.tsx

@@ -81,17 +81,14 @@ const ParseCommandDialog: React.FC<ParseCommandDialogProps> = ({
     onOpenChange(open);
   };
 
+  const backendPlaceholders: Record<BackendTypeValue, string> = {
+    [BackendType.LLAMA_CPP]: "llama-server --model /path/to/model.gguf --gpu-layers 32 --ctx-size 4096",
+    [BackendType.MLX_LM]: "mlx_lm.server --model mlx-community/Mistral-7B-Instruct-v0.3-4bit --host 0.0.0.0 --port 8080",
+    [BackendType.VLLM]: "vllm serve --model microsoft/DialoGPT-medium --tensor-parallel-size 2 --gpu-memory-utilization 0.9",
+  };
+
   const getPlaceholderForBackend = (backendType: BackendTypeValue): string => {
-    switch (backendType) {
+    return backendPlaceholders[backendType] || "Enter your command here...";
-      case BackendType.LLAMA_CPP:
-        return "llama-server --model /path/to/model.gguf --gpu-layers 32 --ctx-size 4096";
-      case BackendType.MLX_LM:
-        return "mlx_lm.server --model mlx-community/Mistral-7B-Instruct-v0.3-4bit --host 0.0.0.0 --port 8080";
-      case BackendType.VLLM:
-        return "vllm serve --model microsoft/DialoGPT-medium --tensor-parallel-size 2 --gpu-memory-utilization 0.9";
-      default:
-        return "Enter your command here...";
-    }
   };
 
   return (

webui/src/components/ZodFormField.tsx

@@ -29,7 +29,6 @@ const ZodFormField: React.FC<ZodFormFieldProps> = ({ fieldKey, value, onChange }
         <div className="grid gap-2">
           <Label htmlFor={fieldKey}>
             {config.label}
-            {config.required && <span className="text-red-500 ml-1">*</span>}
           </Label>
           <select
             id={fieldKey}
@@ -71,7 +70,6 @@ const ZodFormField: React.FC<ZodFormFieldProps> = ({ fieldKey, value, onChange }
           <div className="grid gap-2">
             <Label htmlFor={fieldKey}>
               {config.label}
-              {config.required && <span className="text-red-500 ml-1">*</span>}
               </Label>
             <Input
               id={fieldKey}
@@ -98,7 +96,6 @@ const ZodFormField: React.FC<ZodFormFieldProps> = ({ fieldKey, value, onChange }
           <div className="grid gap-2">
             <Label htmlFor={fieldKey}>
               {config.label}
-              {config.required && <span className="text-red-500 ml-1">*</span>}
               </Label>
             <Input
               id={fieldKey}
@@ -125,7 +122,6 @@ const ZodFormField: React.FC<ZodFormFieldProps> = ({ fieldKey, value, onChange }
           <div className="grid gap-2">
             <Label htmlFor={fieldKey}>
               {config.label}
-              {config.required && <span className="text-red-500 ml-1">*</span>}
               </Label>
             <Input
               id={fieldKey}

webui/src/components/form/ArrayInput.tsx

@@ -0,0 +1,62 @@
+import React from 'react'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+
+interface ArrayInputProps {
+  id: string
+  label: string
+  value: string[] | undefined
+  onChange: (value: string[] | undefined) => void
+  placeholder?: string
+  description?: string
+  disabled?: boolean
+  className?: string
+}
+
+const ArrayInput: React.FC<ArrayInputProps> = ({
+  id,
+  label,
+  value,
+  onChange,
+  placeholder = "item1, item2, item3",
+  description,
+  disabled = false,
+  className
+}) => {
+  const handleChange = (inputValue: string) => {
+    if (inputValue === '') {
+      onChange(undefined)
+      return
+    }
+
+    const arrayValue = inputValue
+      .split(',')
+      .map(s => s.trim())
+      .filter(Boolean)
+
+    onChange(arrayValue.length > 0 ? arrayValue : undefined)
+  }
+
+  return (
+    <div className="grid gap-2">
+      <Label htmlFor={id}>
+        {label}
+      </Label>
+      <Input
+        id={id}
+        type="text"
+        value={Array.isArray(value) ? value.join(', ') : ''}
+        onChange={(e) => handleChange(e.target.value)}
+        placeholder={placeholder}
+        disabled={disabled}
+        className={className}
+      />
+      {description && (
+        <p className="text-sm text-muted-foreground">{description}</p>
+      )}
+      <p className="text-xs text-muted-foreground">Separate multiple values with commas</p>
+    </div>
+  )
+}
+
+export default ArrayInput

webui/src/components/form/CheckboxInput.tsx

@@ -0,0 +1,42 @@
+import React from 'react'
+import { Checkbox } from '@/components/ui/checkbox'
+import { Label } from '@/components/ui/label'
+
+interface CheckboxInputProps {
+  id: string
+  label: string
+  value: boolean | undefined
+  onChange: (value: boolean) => void
+  description?: string
+  disabled?: boolean
+  className?: string
+}
+
+const CheckboxInput: React.FC<CheckboxInputProps> = ({
+  id,
+  label,
+  value,
+  onChange,
+  description,
+  disabled = false,
+  className
+}) => {
+  return (
+    <div className={`flex items-center space-x-2 ${className || ''}`}>
+      <Checkbox
+        id={id}
+        checked={value === true}
+        onCheckedChange={(checked) => onChange(!!checked)}
+        disabled={disabled}
+      />
+      <Label htmlFor={id} className="text-sm font-normal">
+        {label}
+        {description && (
+          <span className="text-muted-foreground ml-1">- {description}</span>
+        )}
+      </Label>
+    </div>
+  )
+}
+
+export default CheckboxInput

webui/src/components/form/NumberInput.tsx

@@ -0,0 +1,60 @@
+import React from 'react'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+
+interface NumberInputProps {
+  id: string
+  label: string
+  value: number | undefined
+  onChange: (value: number | undefined) => void
+  placeholder?: string
+  description?: string
+  disabled?: boolean
+  className?: string
+}
+
+const NumberInput: React.FC<NumberInputProps> = ({
+  id,
+  label,
+  value,
+  onChange,
+  placeholder,
+  description,
+  disabled = false,
+  className
+}) => {
+  const handleChange = (inputValue: string) => {
+    if (inputValue === '') {
+      onChange(undefined)
+      return
+    }
+
+    const numValue = parseFloat(inputValue)
+    if (!isNaN(numValue)) {
+      onChange(numValue)
+    }
+  }
+
+  return (
+    <div className="grid gap-2">
+      <Label htmlFor={id}>
+        {label}
+      </Label>
+      <Input
+        id={id}
+        type="number"
+        step="any"
+        value={value !== undefined ? value : ''}
+        onChange={(e) => handleChange(e.target.value)}
+        placeholder={placeholder}
+        disabled={disabled}
+        className={className}
+      />
+      {description && (
+        <p className="text-sm text-muted-foreground">{description}</p>
+      )}
+    </div>
+  )
+}
+
+export default NumberInput

webui/src/components/form/SelectInput.tsx

@@ -0,0 +1,55 @@
+import React from 'react'
+import { Label } from '@/components/ui/label'
+
+interface SelectOption {
+  value: string
+  label: string
+}
+
+interface SelectInputProps {
+  id: string
+  label: string
+  value: string | undefined
+  onChange: (value: string | undefined) => void
+  options: SelectOption[]
+  description?: string
+  disabled?: boolean
+  className?: string
+}
+
+const SelectInput: React.FC<SelectInputProps> = ({
+  id,
+  label,
+  value,
+  onChange,
+  options,
+  description,
+  disabled = false,
+  className
+}) => {
+  return (
+    <div className="grid gap-2">
+      <Label htmlFor={id}>
+        {label}
+      </Label>
+      <select
+        id={id}
+        value={value || ''}
+        onChange={(e) => onChange(e.target.value || undefined)}
+        disabled={disabled}
+        className={`flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 ${className || ''}`}
+      >
+        {options.map(option => (
+          <option key={option.value} value={option.value}>
+            {option.label}
+          </option>
+        ))}
+      </select>
+      {description && (
+        <p className="text-sm text-muted-foreground">{description}</p>
+      )}
+    </div>
+  )
+}
+
+export default SelectInput

webui/src/components/form/TextInput.tsx

@@ -0,0 +1,47 @@
+import React from 'react'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+
+interface TextInputProps {
+  id: string
+  label: string
+  value: string | number | undefined
+  onChange: (value: string | undefined) => void
+  placeholder?: string
+  description?: string
+  disabled?: boolean
+  className?: string
+}
+
+const TextInput: React.FC<TextInputProps> = ({
+  id,
+  label,
+  value,
+  onChange,
+  placeholder,
+  description,
+  disabled = false,
+  className
+}) => {
+  return (
+    <div className="grid gap-2">
+      <Label htmlFor={id}>
+        {label}
+      </Label>
+      <Input
+        id={id}
+        type="text"
+        value={typeof value === 'string' || typeof value === 'number' ? value : ''}
+        onChange={(e) => onChange(e.target.value || undefined)}
+        placeholder={placeholder}
+        disabled={disabled}
+        className={className}
+      />
+      {description && (
+        <p className="text-sm text-muted-foreground">{description}</p>
+      )}
+    </div>
+  )
+}
+
+export default TextInput

webui/src/components/instance/AdvancedInstanceFields.tsx

@@ -0,0 +1,98 @@
+import React from 'react'
+import type { CreateInstanceOptions } from '@/types/instance'
+import { getAdvancedFields, basicFieldsConfig } from '@/lib/zodFormUtils'
+import { getFieldType } from '@/schemas/instanceOptions'
+import TextInput from '@/components/form/TextInput'
+import NumberInput from '@/components/form/NumberInput'
+import CheckboxInput from '@/components/form/CheckboxInput'
+import ArrayInput from '@/components/form/ArrayInput'
+
+interface AdvancedInstanceFieldsProps {
+  formData: CreateInstanceOptions
+  onChange: (key: keyof CreateInstanceOptions, value: any) => void
+}
+
+const AdvancedInstanceFields: React.FC<AdvancedInstanceFieldsProps> = ({
+  formData,
+  onChange
+}) => {
+  const advancedFields = getAdvancedFields()
+
+  const renderField = (fieldKey: keyof CreateInstanceOptions) => {
+    const config = basicFieldsConfig[fieldKey as string] || { label: fieldKey }
+    const fieldType = getFieldType(fieldKey)
+
+    switch (fieldType) {
+      case 'boolean':
+        return (
+          <CheckboxInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as boolean | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            description={config.description}
+          />
+        )
+
+      case 'number':
+        return (
+          <NumberInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as number | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            placeholder={config.placeholder}
+            description={config.description}
+          />
+        )
+
+      case 'array':
+        return (
+          <ArrayInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as string[] | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            placeholder={config.placeholder}
+            description={config.description}
+          />
+        )
+
+      default:
+        return (
+          <TextInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as string | number | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            placeholder={config.placeholder}
+            description={config.description}
+          />
+        )
+    }
+  }
+
+  // Filter out restart options and backend_options (handled separately)
+  const fieldsToRender = advancedFields.filter(
+    fieldKey => !['max_restarts', 'restart_delay', 'backend_options'].includes(fieldKey as string)
+  )
+
+  if (fieldsToRender.length === 0) {
+    return null
+  }
+
+  return (
+    <div className="space-y-4">
+      <h4 className="text-md font-medium">Advanced Instance Configuration</h4>
+      {fieldsToRender
+        .sort()
+        .map(renderField)}
+    </div>
+  )
+}
+
+export default AdvancedInstanceFields

webui/src/components/instance/AutoRestartConfiguration.tsx

@@ -0,0 +1,53 @@
+import React from 'react'
+import type { CreateInstanceOptions } from '@/types/instance'
+import CheckboxInput from '@/components/form/CheckboxInput'
+import NumberInput from '@/components/form/NumberInput'
+
+interface AutoRestartConfigurationProps {
+  formData: CreateInstanceOptions
+  onChange: (key: keyof CreateInstanceOptions, value: any) => void
+}
+
+const AutoRestartConfiguration: React.FC<AutoRestartConfigurationProps> = ({
+  formData,
+  onChange
+}) => {
+  const isAutoRestartEnabled = formData.auto_restart === true
+
+  return (
+    <div className="space-y-4">
+      <h3 className="text-lg font-medium">Auto Restart Configuration</h3>
+
+      <CheckboxInput
+        id="auto_restart"
+        label="Auto Restart"
+        value={formData.auto_restart}
+        onChange={(value) => onChange('auto_restart', value)}
+        description="Automatically restart the instance on failure"
+      />
+
+      {isAutoRestartEnabled && (
+        <div className="ml-6 space-y-4 border-l-2 border-muted pl-4">
+          <NumberInput
+            id="max_restarts"
+            label="Max Restarts"
+            value={formData.max_restarts}
+            onChange={(value) => onChange('max_restarts', value)}
+            placeholder="3"
+            description="Maximum number of restart attempts (0 = unlimited)"
+          />
+          <NumberInput
+            id="restart_delay"
+            label="Restart Delay (seconds)"
+            value={formData.restart_delay}
+            onChange={(value) => onChange('restart_delay', value)}
+            placeholder="5"
+            description="Delay in seconds before attempting restart"
+          />
+        </div>
+      )}
+    </div>
+  )
+}
+
+export default AutoRestartConfiguration

webui/src/components/instance/BackendConfiguration.tsx

@@ -0,0 +1,54 @@
+import React from 'react'
+import type { CreateInstanceOptions } from '@/types/instance'
+import { getBasicBackendFields, getAdvancedBackendFields } from '@/lib/zodFormUtils'
+import BackendFormField from '@/components/BackendFormField'
+
+interface BackendConfigurationProps {
+  formData: CreateInstanceOptions
+  onBackendFieldChange: (key: string, value: any) => void
+  showAdvanced?: boolean
+}
+
+const BackendConfiguration: React.FC<BackendConfigurationProps> = ({
+  formData,
+  onBackendFieldChange,
+  showAdvanced = false
+}) => {
+  const basicBackendFields = getBasicBackendFields(formData.backend_type)
+  const advancedBackendFields = getAdvancedBackendFields(formData.backend_type)
+
+  return (
+    <div className="space-y-4">
+      <h3 className="text-lg font-medium">Backend Configuration</h3>
+
+      {/* Basic backend fields */}
+      {basicBackendFields.map((fieldKey) => (
+        <BackendFormField
+          key={fieldKey}
+          fieldKey={fieldKey}
+          value={(formData.backend_options as any)?.[fieldKey]}
+          onChange={onBackendFieldChange}
+        />
+      ))}
+
+      {/* Advanced backend fields */}
+      {showAdvanced && advancedBackendFields.length > 0 && (
+        <div className="space-y-4 pl-6 border-l-2 border-muted">
+          <h4 className="text-md font-medium">Advanced Backend Configuration</h4>
+          {advancedBackendFields
+            .sort()
+            .map((fieldKey) => (
+              <BackendFormField
+                key={fieldKey}
+                fieldKey={fieldKey}
+                value={(formData.backend_options as any)?.[fieldKey]}
+                onChange={onBackendFieldChange}
+              />
+            ))}
+        </div>
+      )}
+    </div>
+  )
+}
+
+export default BackendConfiguration

webui/src/components/instance/BasicInstanceFields.tsx

@@ -0,0 +1,99 @@
+import React from 'react'
+import { BackendType, type CreateInstanceOptions } from '@/types/instance'
+import { getBasicFields, basicFieldsConfig } from '@/lib/zodFormUtils'
+import { getFieldType } from '@/schemas/instanceOptions'
+import TextInput from '@/components/form/TextInput'
+import NumberInput from '@/components/form/NumberInput'
+import CheckboxInput from '@/components/form/CheckboxInput'
+import SelectInput from '@/components/form/SelectInput'
+
+interface BasicInstanceFieldsProps {
+  formData: CreateInstanceOptions
+  onChange: (key: keyof CreateInstanceOptions, value: any) => void
+}
+
+const BasicInstanceFields: React.FC<BasicInstanceFieldsProps> = ({
+  formData,
+  onChange
+}) => {
+  const basicFields = getBasicFields()
+
+  const renderField = (fieldKey: keyof CreateInstanceOptions) => {
+    const config = basicFieldsConfig[fieldKey as string] || { label: fieldKey }
+    const fieldType = getFieldType(fieldKey)
+
+    // Special handling for backend_type field
+    if (fieldKey === 'backend_type') {
+      return (
+        <SelectInput
+          key={fieldKey}
+          id={fieldKey}
+          label={config.label}
+          value={formData[fieldKey] || BackendType.LLAMA_CPP}
+          onChange={(value) => onChange(fieldKey, value)}
+          options={[
+            { value: BackendType.LLAMA_CPP, label: 'Llama Server' },
+            { value: BackendType.MLX_LM, label: 'MLX LM' },
+            { value: BackendType.VLLM, label: 'vLLM' }
+          ]}
+          description={config.description}
+        />
+      )
+    }
+
+    // Render based on field type
+    switch (fieldType) {
+      case 'boolean':
+        return (
+          <CheckboxInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as boolean | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            description={config.description}
+          />
+        )
+
+      case 'number':
+        return (
+          <NumberInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as number | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            placeholder={config.placeholder}
+            description={config.description}
+          />
+        )
+
+      default:
+        return (
+          <TextInput
+            key={fieldKey}
+            id={fieldKey}
+            label={config.label}
+            value={formData[fieldKey] as string | number | undefined}
+            onChange={(value) => onChange(fieldKey, value)}
+            placeholder={config.placeholder}
+            description={config.description}
+          />
+        )
+    }
+  }
+
+  // Filter out auto restart fields and backend_options (handled separately)
+  const fieldsToRender = basicFields.filter(
+    fieldKey => !['auto_restart', 'max_restarts', 'restart_delay', 'backend_options'].includes(fieldKey as string)
+  )
+
+  return (
+    <div className="space-y-4">
+      <h3 className="text-lg font-medium">Basic Configuration</h3>
+      {fieldsToRender.map(renderField)}
+    </div>
+  )
+}
+
+export default BasicInstanceFields

webui/src/lib/api.ts

@@ -1,4 +1,5 @@
 import type { CreateInstanceOptions, Instance } from "@/types/instance";
+import { handleApiError } from "./errorUtils";
 
 const API_BASE = "/api/v1";
 
@@ -30,25 +31,8 @@ async function apiCall<T>(
       headers,
     });
 
-    // Handle authentication errors
+    // Handle errors using centralized error handler
-    if (response.status === 401) {
+    await handleApiError(response);
-      throw new Error('Authentication required');
-    }
-
-    if (!response.ok) {
-      // Try to get error message from response
-      let errorMessage = `HTTP ${response.status}`;
-      try {
-        const errorText = await response.text();
-        if (errorText) {
-          errorMessage += `: ${errorText}`;
-        }
-      } catch {
-        // If we can't read the error, just use status
-      }
-
-      throw new Error(errorMessage);
-    }
 
     // Handle empty responses (like DELETE)
     if (response.status === 204) {

webui/src/lib/errorUtils.ts

@@ -0,0 +1,32 @@
+/**
+ * Parses error response from API calls and returns a formatted error message
+ */
+export async function parseErrorResponse(response: Response): Promise<string> {
+  let errorMessage = `HTTP ${response.status}`
+
+  try {
+    const errorText = await response.text()
+    if (errorText) {
+      errorMessage += `: ${errorText}`
+    }
+  } catch {
+    // If we can't read the error, just use status
+  }
+
+  return errorMessage
+}
+
+/**
+ * Handles common API call errors and throws appropriate Error objects
+ */
+export async function handleApiError(response: Response): Promise<void> {
+  // Handle authentication errors
+  if (response.status === 401) {
+    throw new Error('Authentication required')
+  }
+
+  if (!response.ok) {
+    const errorMessage = await parseErrorResponse(response)
+    throw new Error(errorMessage)
+  }
+}

webui/src/lib/zodFormUtils.ts

@@ -20,7 +20,6 @@ export const basicFieldsConfig: Record<string, {
   label: string
   description?: string
   placeholder?: string
-  required?: boolean
 }> = {
   auto_restart: {
     label: 'Auto Restart',
@@ -56,13 +55,11 @@ const basicLlamaCppFieldsConfig: Record<string, {
   label: string
   description?: string
   placeholder?: string
-  required?: boolean
 }> = {
   model: {
     label: 'Model Path',
     placeholder: '/path/to/model.gguf',
-    description: 'Path to the model file',
+    description: 'Path to the model file'
-    required: true
   },
   hf_repo: {
     label: 'Hugging Face Repository',
@@ -86,13 +83,11 @@ const basicMlxFieldsConfig: Record<string, {
   label: string
   description?: string
   placeholder?: string
-  required?: boolean
 }> = {
   model: {
     label: 'Model',
     placeholder: 'mlx-community/Mistral-7B-Instruct-v0.3-4bit',
-    description: 'The path to the MLX model weights, tokenizer, and config',
+    description: 'The path to the MLX model weights, tokenizer, and config'
-    required: true
   },
   temp: {
     label: 'Temperature',
@@ -126,13 +121,11 @@ const basicVllmFieldsConfig: Record<string, {
   label: string
   description?: string
   placeholder?: string
-  required?: boolean
 }> = {
   model: {
     label: 'Model',
     placeholder: 'microsoft/DialoGPT-medium',
-    description: 'The name or path of the Hugging Face model to use',
+    description: 'The name or path of the Hugging Face model to use'
-    required: true
   },
   tensor_parallel_size: {
     label: 'Tensor Parallel Size',
@@ -146,11 +139,23 @@ const basicVllmFieldsConfig: Record<string, {
   }
 }
 
+// Backend field configuration lookup
+const backendFieldConfigs = {
+  mlx_lm: basicMlxFieldsConfig,
+  vllm: basicVllmFieldsConfig,
+  llama_cpp: basicLlamaCppFieldsConfig,
+} as const
+
+const backendFieldGetters = {
+  mlx_lm: getAllMlxFieldKeys,
+  vllm: getAllVllmFieldKeys,
+  llama_cpp: getAllLlamaCppFieldKeys,
+} as const
+
 function isBasicField(key: keyof CreateInstanceOptions): boolean {
   return key in basicFieldsConfig
 }
 
-
 export function getBasicFields(): (keyof CreateInstanceOptions)[] {
   return Object.keys(basicFieldsConfig) as (keyof CreateInstanceOptions)[]
 }
@@ -159,29 +164,18 @@ export function getAdvancedFields(): (keyof CreateInstanceOptions)[] {
   return getAllFieldKeys().filter(key => !isBasicField(key))
 }
 
-
 export function getBasicBackendFields(backendType?: string): string[] {
-  if (backendType === 'mlx_lm') {
+  const normalizedType = (backendType || 'llama_cpp') as keyof typeof backendFieldConfigs
-    return Object.keys(basicMlxFieldsConfig)
+  const config = backendFieldConfigs[normalizedType] || basicLlamaCppFieldsConfig
-  } else if (backendType === 'vllm') {
+  return Object.keys(config)
-    return Object.keys(basicVllmFieldsConfig)
-  } else if (backendType === 'llama_cpp') {
-    return Object.keys(basicLlamaCppFieldsConfig)
-  }
-  // Default to LlamaCpp for backward compatibility
-  return Object.keys(basicLlamaCppFieldsConfig)
 }
 
 export function getAdvancedBackendFields(backendType?: string): string[] {
-  if (backendType === 'mlx_lm') {
+  const normalizedType = (backendType || 'llama_cpp') as keyof typeof backendFieldGetters
-    return getAllMlxFieldKeys().filter(key => !(key in basicMlxFieldsConfig))
+  const fieldGetter = backendFieldGetters[normalizedType] || getAllLlamaCppFieldKeys
-  } else if (backendType === 'vllm') {
+  const basicConfig = backendFieldConfigs[normalizedType] || basicLlamaCppFieldsConfig
-    return getAllVllmFieldKeys().filter(key => !(key in basicVllmFieldsConfig))
+
-  } else if (backendType === 'llama_cpp') {
+  return fieldGetter().filter(key => !(key in basicConfig))
-    return getAllLlamaCppFieldKeys().filter(key => !(key in basicLlamaCppFieldsConfig))
-  }
-  // Default to LlamaCpp for backward compatibility
-  return getAllLlamaCppFieldKeys().filter(key => !(key in basicLlamaCppFieldsConfig))
 }
 
 // Combined backend fields config for use in BackendFormField
@@ -189,7 +183,6 @@ export const basicBackendFieldsConfig: Record<string, {
   label: string
   description?: string
   placeholder?: string
-  required?: boolean
 }> = {
   ...basicLlamaCppFieldsConfig,
   ...basicMlxFieldsConfig,