diff --git a/package.json b/package.json
index 67726b9..a6d9f27 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,9 @@
         "kill": "fuser -k 5000/tcp",
         "prebuild": "mkdir -p /tmp/dist || true",
         "build": "tsc -b --noCheck && vite build",
-        "lint": "eslint . --fix",
-        "lint:check": "eslint .",
+        "lint": "eslint . --fix && npm run lint:schemas",
+        "lint:check": "eslint . && npm run lint:schemas",
+        "lint:schemas": "node scripts/lint-json-ui-schemas.cjs",
         "optimize": "vite optimize",
         "preview": "vite preview --host 0.0.0.0 --port ${PORT:-80}",
         "test:e2e": "playwright test",
diff --git a/scripts/lint-json-ui-schemas.cjs b/scripts/lint-json-ui-schemas.cjs
new file mode 100644
index 0000000..2e13c03
--- /dev/null
+++ b/scripts/lint-json-ui-schemas.cjs
@@ -0,0 +1,252 @@
+const fs = require('fs')
+const path = require('path')
+
+const rootDir = path.resolve(__dirname, '..')
+const definitionsPath = path.join(rootDir, 'src', 'lib', 'component-definitions.json')
+const schemaDirs = [
+  path.join(rootDir, 'src', 'schemas'),
+  path.join(rootDir, 'public', 'schemas'),
+]
+
+const commonProps = new Set(['className', 'style', 'children'])
+const bindingSourceTypes = new Set(['data', 'bindings', 'state'])
+
+const readJson = (filePath) => JSON.parse(fs.readFileSync(filePath, 'utf8'))
+const fileExists = (filePath) => fs.existsSync(filePath)
+
+const componentDefinitions = readJson(definitionsPath)
+const definitionsByType = new Map(
+  componentDefinitions
+    .filter((definition) => definition.type)
+    .map((definition) => [definition.type, definition])
+)
+
+const errors = []
+
+const reportError = (file, pathLabel, message) => {
+  errors.push({ file, path: pathLabel, message })
+}
+
+const collectSchemaFiles = (dirs) => {
+  const files = []
+  dirs.forEach((dir) => {
+    if (!fileExists(dir)) return
+    fs.readdirSync(dir).forEach((entry) => {
+      if (!entry.endsWith('.json')) return
+      files.push(path.join(dir, entry))
+    })
+  })
+  return files
+}
+
+const isPageSchema = (schema) =>
+  schema
+  && typeof schema === 'object'
+  && schema.layout
+  && Array.isArray(schema.components)
+
+const extractSchemas = (data, filePath) => {
+  if (isPageSchema(data)) {
+    return [{ name: filePath, schema: data }]
+  }
+
+  if (data && typeof data === 'object') {
+    const schemas = Object.entries(data)
+      .filter(([, value]) => isPageSchema(value))
+      .map(([key, value]) => ({ name: `${filePath}:${key}`, schema: value }))
+    if (schemas.length > 0) {
+      return schemas
+    }
+  }
+
+  return []
+}
+
+const validateBindings = (bindings, fileLabel, pathLabel, contextVars, dataSourceIds, definition) => {
+  if (!bindings) return
+
+  const propDefinitions = definition?.props
+    ? new Map(definition.props.map((prop) => [prop.name, prop]))
+    : null
+
+  Object.entries(bindings).forEach(([propName, binding]) => {
+    if (propDefinitions) {
+      if (!propDefinitions.has(propName) && !commonProps.has(propName)) {
+        reportError(fileLabel, `${pathLabel}.bindings.${propName}`, `Invalid binding for unknown prop "${propName}"`)
+        return
+      }
+
+      const propDefinition = propDefinitions.get(propName)
+      if (propDefinition && propDefinition.supportsBinding !== true) {
+        reportError(fileLabel, `${pathLabel}.bindings.${propName}`, `Binding not supported for prop "${propName}"`)
+      }
+    }
+
+    if (binding && typeof binding === 'object') {
+      const sourceType = binding.sourceType ?? 'data'
+      if (!bindingSourceTypes.has(sourceType)) {
+        reportError(
+          fileLabel,
+          `${pathLabel}.bindings.${propName}.sourceType`,
+          `Unsupported binding sourceType "${sourceType}"`
+        )
+      }
+
+      const source = binding.source
+      if (source && sourceType !== 'state') {
+        const isKnownSource = dataSourceIds.has(source) || contextVars.has(source)
+        if (!isKnownSource) {
+          reportError(
+            fileLabel,
+            `${pathLabel}.bindings.${propName}.source`,
+            `Binding source "${source}" is not defined in dataSources or loop context`
+          )
+        }
+      }
+    }
+  })
+}
+
+const validateDataBinding = (dataBinding, fileLabel, pathLabel, contextVars, dataSourceIds) => {
+  if (!dataBinding || typeof dataBinding !== 'object') return
+
+  const sourceType = dataBinding.sourceType ?? 'data'
+  if (!bindingSourceTypes.has(sourceType)) {
+    reportError(
+      fileLabel,
+      `${pathLabel}.dataBinding.sourceType`,
+      `Unsupported dataBinding sourceType "${sourceType}"`
+    )
+  }
+
+  if (dataBinding.source && sourceType !== 'state') {
+    const isKnownSource = dataSourceIds.has(dataBinding.source) || contextVars.has(dataBinding.source)
+    if (!isKnownSource) {
+      reportError(
+        fileLabel,
+        `${pathLabel}.dataBinding.source`,
+        `Data binding source "${dataBinding.source}" is not defined in dataSources or loop context`
+      )
+    }
+  }
+}
+
+const validateRequiredProps = (component, fileLabel, pathLabel, definition, bindings) => {
+  if (!definition?.props) return
+
+  definition.props.forEach((prop) => {
+    if (!prop.required) return
+
+    const hasProp = component.props && Object.prototype.hasOwnProperty.call(component.props, prop.name)
+    const hasBinding = bindings && Object.prototype.hasOwnProperty.call(bindings, prop.name)
+
+    if (!hasProp && (!prop.supportsBinding || !hasBinding)) {
+      reportError(
+        fileLabel,
+        `${pathLabel}.props.${prop.name}`,
+        `Missing required prop "${prop.name}" for component type "${component.type}"`
+      )
+    }
+  })
+}
+
+const validateProps = (component, fileLabel, pathLabel, definition) => {
+  if (!component.props || !definition?.props) return
+
+  const allowedProps = new Set(definition.props.map((prop) => prop.name))
+  commonProps.forEach((prop) => allowedProps.add(prop))
+
+  Object.keys(component.props).forEach((propName) => {
+    if (!allowedProps.has(propName)) {
+      reportError(
+        fileLabel,
+        `${pathLabel}.props.${propName}`,
+        `Invalid prop "${propName}" for component type "${component.type}"`
+      )
+    }
+  })
+}
+
+const lintComponent = (component, fileLabel, pathLabel, contextVars, dataSourceIds) => {
+  if (!component || typeof component !== 'object') return
+
+  if (!component.id) {
+    reportError(fileLabel, pathLabel, 'Missing required component id')
+  }
+
+  if (!component.type) {
+    reportError(fileLabel, pathLabel, 'Missing required component type')
+    return
+  }
+
+  const definition = definitionsByType.get(component.type)
+
+  validateProps(component, fileLabel, pathLabel, definition)
+  validateRequiredProps(component, fileLabel, pathLabel, definition, component.bindings)
+  validateBindings(component.bindings, fileLabel, pathLabel, contextVars, dataSourceIds, definition)
+  validateDataBinding(component.dataBinding, fileLabel, pathLabel, contextVars, dataSourceIds)
+
+  const nextContextVars = new Set(contextVars)
+  const repeatConfig = component.loop ?? component.repeat
+  if (repeatConfig) {
+    if (repeatConfig.itemVar) {
+      nextContextVars.add(repeatConfig.itemVar)
+    }
+    if (repeatConfig.indexVar) {
+      nextContextVars.add(repeatConfig.indexVar)
+    }
+  }
+
+  if (Array.isArray(component.children)) {
+    component.children.forEach((child, index) => {
+      if (typeof child === 'string') return
+      lintComponent(child, fileLabel, `${pathLabel}.children[${index}]`, nextContextVars, dataSourceIds)
+    })
+  }
+
+  if (component.conditional) {
+    const branches = [component.conditional.then, component.conditional.else]
+    branches.forEach((branch, branchIndex) => {
+      if (!branch) return
+      if (typeof branch === 'string') return
+      if (Array.isArray(branch)) {
+        branch.forEach((child, index) => {
+          if (typeof child === 'string') return
+          lintComponent(child, fileLabel, `${pathLabel}.conditional.${branchIndex}[${index}]`, nextContextVars, dataSourceIds)
+        })
+      } else {
+        lintComponent(branch, fileLabel, `${pathLabel}.conditional.${branchIndex}`, nextContextVars, dataSourceIds)
+      }
+    })
+  }
+}
+
+const lintSchema = (schema, fileLabel) => {
+  const dataSourceIds = new Set(
+    Array.isArray(schema.dataSources)
+      ? schema.dataSources.map((source) => source.id).filter(Boolean)
+      : []
+  )
+
+  schema.components.forEach((component, index) => {
+    lintComponent(component, fileLabel, `components[${index}]`, new Set(), dataSourceIds)
+  })
+}
+
+const schemaFiles = collectSchemaFiles(schemaDirs)
+
+schemaFiles.forEach((filePath) => {
+  const data = readJson(filePath)
+  const schemas = extractSchemas(data, filePath)
+  schemas.forEach(({ name, schema }) => lintSchema(schema, name))
+})
+
+if (errors.length > 0) {
+  console.error('JSON UI lint errors found:')
+  errors.forEach((error) => {
+    console.error(`- ${error.file} :: ${error.path} :: ${error.message}`)
+  })
+  process.exit(1)
+}
+
+console.log('JSON UI lint passed.')