diff --git a/src/core/json-schema-components.jsx b/src/core/json-schema-components.jsx
index 194059ead68..47a1981099e 100644
--- a/src/core/json-schema-components.jsx
+++ b/src/core/json-schema-components.jsx
@@ -171,7 +171,10 @@ export class JsonSchema_array extends PureComponent {
   render() {
     let { getComponent, required, schema, errors, fn, disabled } = this.props
 
-    errors = errors.toJS ? errors.toJS() : []
+    errors = errors.toJS ? errors.toJS() : Array.isArray(errors) ? errors : []
+    const arrayErrors = errors.filter(e => typeof e === "string")
+    const needsRemoveError = errors.filter(e => e.needRemove !== undefined)
+      .map(e => e.error)
     const value = this.state.value // expect Im List
     const shouldRenderValue =
       value && value.count && value.count() > 0 ? true : false
@@ -210,10 +213,10 @@ export class JsonSchema_array extends PureComponent {
       <div className="json-schema-array">
         {shouldRenderValue ?
           (value.map((item, i) => {
-            if (errors.length) {
-              let err = errors.filter((err) => err.index === i)
-              if (err.length) errors = [err[0].error + i]
-            }
+            const itemErrors = fromJS([
+              ...errors.filter((err) => err.index === i)
+              .map(e => e.error)
+            ])
             return (
               <div key={i} className="json-schema-form-item">
                 {
@@ -222,7 +225,7 @@ export class JsonSchema_array extends PureComponent {
                     value={item}
                     onChange={(val)=> this.onItemChange(val, i)}
                     disabled={disabled}
-                    errors={errors}
+                    errors={itemErrors}
                     getComponent={getComponent}
                     />
                     : isArrayItemText ?
@@ -230,13 +233,13 @@ export class JsonSchema_array extends PureComponent {
                         value={item}
                         onChange={(val) => this.onItemChange(val, i)}
                         disabled={disabled}
-                        errors={errors}
+                        errors={itemErrors}
                       />
                       : <ArrayItemsComponent {...this.props}
                         value={item}
                         onChange={(val) => this.onItemChange(val, i)}
                         disabled={disabled}
-                        errors={errors}
+                        errors={itemErrors}
                         schema={schemaItemsSchema}
                         getComponent={getComponent}
                         fn={fn}
@@ -244,7 +247,9 @@ export class JsonSchema_array extends PureComponent {
                 }
                 {!disabled ? (
                   <Button
-                    className="btn btn-sm json-schema-form-item-remove"
+                    className={`btn btn-sm json-schema-form-item-remove ${needsRemoveError.length ? "invalid" : null}`}
+                    title={needsRemoveError.length ? needsRemoveError : ""}
+
                     onClick={() => this.removeItem(i)}
                   > - </Button>
                 ) : null}
@@ -255,7 +260,8 @@ export class JsonSchema_array extends PureComponent {
         }
         {!disabled ? (
           <Button
-            className={`btn btn-sm json-schema-form-item-add ${errors.length ? "invalid" : null}`}
+            className={`btn btn-sm json-schema-form-item-add ${arrayErrors.length ? "invalid" : null}`}
+            title={arrayErrors.length ? arrayErrors : ""}
             onClick={this.addItem}
           >
             Add item
@@ -340,6 +346,31 @@ export class JsonSchema_boolean extends Component {
   }
 }
 
+const stringifyObjectErrors = (errors) => {
+  return errors.map(err => {
+    const meta = err.propKey !== undefined ? err.propKey : err.index
+    let stringError = typeof err === "string" ? err : typeof err.error === "string" ? err.error : null
+
+    if(!meta && stringError) {
+      return stringError
+    }
+    let currentError = err.error
+    let path = `/${err.propKey}`
+    while(typeof currentError === "object") {
+      const part = currentError.propKey !== undefined ? currentError.propKey : currentError.index
+      if(part === undefined) {
+        break
+      }
+      path += `/${part}`
+      if (!currentError.error) {
+        break
+      }
+      currentError = currentError.error
+    }
+    return `${path}: ${currentError}`
+  })
+}
+
 export class JsonSchema_object extends PureComponent {
   constructor() {
     super()
@@ -367,18 +398,18 @@ export class JsonSchema_object extends PureComponent {
     } = this.props
 
     const TextArea = getComponent("TextArea")
+    errors = errors.toJS ? errors.toJS() : Array.isArray(errors) ? errors : []
 
     return (
       <div>
         <TextArea
-          className={cx({ invalid: errors.size })}
-          title={ errors.size ? errors.join(", ") : ""}
+          className={cx({ invalid: errors.length })}
+          title={ errors.length ? stringifyObjectErrors(errors).join(", ") : ""}
           value={stringify(value)}
           disabled={disabled}
           onChange={ this.handleOnChange }/>
       </div>
     )
-
   }
 }
 
diff --git a/src/core/utils.js b/src/core/utils.js
index 4e5ae0cbff8..771da4d0ec9 100644
--- a/src/core/utils.js
+++ b/src/core/utils.js
@@ -10,7 +10,7 @@
   in `./helpers` if you have the time.
 */
 
-import Im from "immutable"
+import Im, { fromJS, Set } from "immutable"
 import { sanitizeUrl as braintreeSanitizeUrl } from "@braintree/sanitize-url"
 import camelCase from "lodash/camelCase"
 import upperFirst from "lodash/upperFirst"
@@ -385,6 +385,40 @@ export const validateMaxLength = (val, max) => {
   }
 }
 
+export const validateUniqueItems = (val, uniqueItems) => {
+  if (!val) {
+    return
+  }
+  if (uniqueItems === "true" || uniqueItems === true) {
+    const list = fromJS(val)
+    const set = list.toSet()
+    const hasDuplicates = val.length > set.size
+    if(hasDuplicates) {
+      let errorsPerIndex = Set()
+      list.forEach((item, i) => {
+        if(list.filter(v => isFunc(v.equals) ? v.equals(item) : v === item).size > 1) {
+          errorsPerIndex = errorsPerIndex.add(i)
+        }
+      })
+      if(errorsPerIndex.size !== 0) {
+        return errorsPerIndex.map(i => ({index: i, error: "No duplicates allowed."})).toArray()
+      }
+    }
+  }
+}
+
+export const validateMinItems = (val, min) => {
+  if (!val && min >= 1 || val && val.length < min) {
+      return `Array must contain at least ${min} item${min === 1 ? "" : "s"}`
+  }
+}
+
+export const validateMaxItems = (val, max) => {
+  if (val && val.length > max) {
+    return `Array must not contain more then ${max} item${max === 1 ? "" : "s"}`
+  }
+}
+
 export const validateMinLength = (val, min) => {
   if (val.length < min) {
       return `Value must be at least ${min} character${min !== 1 ? "s" : ""}`
@@ -398,32 +432,28 @@ export const validatePattern = (val, rxPattern) => {
   }
 }
 
-// validation of parameters before execute
-export const validateParam = (param, value, { isOAS3 = false, bypassRequiredCheck = false } = {}) => {
-
+function validateValueBySchema(value, schema, isParamRequired, bypassRequiredCheck, parameterContentMediaType) {
+  if(!schema) return []
   let errors = []
-
-  let paramRequired = param.get("required")
-
-  let { schema: paramDetails, parameterContentMediaType } = getParameterSchema(param, { isOAS3 })
-
-  if(!paramDetails) return errors
-
-  let required = paramDetails.get("required")
-  let maximum = paramDetails.get("maximum")
-  let minimum = paramDetails.get("minimum")
-  let type = paramDetails.get("type")
-  let format = paramDetails.get("format")
-  let maxLength = paramDetails.get("maxLength")
-  let minLength = paramDetails.get("minLength")
-  let pattern = paramDetails.get("pattern")
+  let required = schema.get("required")
+  let maximum = schema.get("maximum")
+  let minimum = schema.get("minimum")
+  let type = schema.get("type")
+  let format = schema.get("format")
+  let maxLength = schema.get("maxLength")
+  let minLength = schema.get("minLength")
+  let uniqueItems = schema.get("uniqueItems")
+  let maxItems = schema.get("maxItems")
+  let minItems = schema.get("minItems")
+  let pattern = schema.get("pattern")
 
   /*
     If the parameter is required OR the parameter has a value (meaning optional, but filled in)
     then we should do our validation routine.
     Only bother validating the parameter if the type was specified.
+    in case of array an empty value needs validation too because constrains can be set to require minItems
   */
-  if ( type && (paramRequired || required || value) ) {
+  if (type && (isParamRequired || required || value !== undefined || type === "array")) {
     // These checks should evaluate to true if there is a parameter
     let stringCheck = type === "string" && value
     let arrayCheck = type === "array" && Array.isArray(value) && value.length
@@ -443,22 +473,37 @@ export const validateParam = (param, value, { isOAS3 = false, bypassRequiredChec
 
     const passedAnyCheck = allChecks.some(v => !!v)
 
-    if ((paramRequired || required) && !passedAnyCheck && !bypassRequiredCheck ) {
+    if ((isParamRequired || required) && !passedAnyCheck && !bypassRequiredCheck) {
       errors.push("Required field is not provided")
       return errors
     }
-
     if (
       type === "object" &&
-      typeof value === "string" &&
       (parameterContentMediaType === null ||
         parameterContentMediaType === "application/json")
     ) {
-      try {
-        JSON.parse(value)
-      } catch (e) {
-        errors.push("Parameter string value must be valid JSON")
-        return errors
+      let objectVal = value
+      if(typeof value === "string") {
+        try {
+          objectVal = JSON.parse(value)
+        } catch (e) {
+          errors.push("Parameter string value must be valid JSON")
+          return errors
+        }
+      }
+      if(schema && schema.has("required") && isFunc(required.isList) && required.isList()) {
+        required.forEach(key => {
+          if(objectVal[key] === undefined) {
+            errors.push({ propKey: key, error: "Required property not found" })
+          }
+        })
+      }
+      if(schema && schema.has("properties")) {
+        schema.get("properties").forEach((val, key) => {
+          const errs = validateValueBySchema(objectVal[key], val, false, bypassRequiredCheck, parameterContentMediaType)
+          errors.push(...errs
+            .map((error) => ({ propKey: key, error })))
+        })
       }
     }
 
@@ -467,6 +512,27 @@ export const validateParam = (param, value, { isOAS3 = false, bypassRequiredChec
       if (err) errors.push(err)
     }
 
+    if (minItems) {
+      if (type === "array") {
+        let err = validateMinItems(value, minItems)
+        if (err) errors.push(err)
+      }
+    }
+
+    if (maxItems) {
+      if (type === "array") {
+        let err = validateMaxItems(value, maxItems)
+        if (err) errors.push({ needRemove: true, error: err })
+      }
+    }
+
+    if (uniqueItems) {
+      if (type === "array") {
+        let errorPerItem = validateUniqueItems(value, uniqueItems)
+        if (errorPerItem) errors.push(...errorPerItem)
+      }
+    }
+
     if (maxLength || maxLength === 0) {
       let err = validateMaxLength(value, maxLength)
       if (err) errors.push(err)
@@ -487,52 +553,41 @@ export const validateParam = (param, value, { isOAS3 = false, bypassRequiredChec
       if (err) errors.push(err)
     }
 
-    if ( type === "string" ) {
+    if (type === "string") {
       let err
       if (format === "date-time") {
-          err = validateDateTime(value)
+        err = validateDateTime(value)
       } else if (format === "uuid") {
-          err = validateGuid(value)
+        err = validateGuid(value)
       } else {
-          err = validateString(value)
+        err = validateString(value)
       }
       if (!err) return errors
       errors.push(err)
-    } else if ( type === "boolean" ) {
+    } else if (type === "boolean") {
       let err = validateBoolean(value)
       if (!err) return errors
       errors.push(err)
-    } else if ( type === "number" ) {
+    } else if (type === "number") {
       let err = validateNumber(value)
       if (!err) return errors
       errors.push(err)
-    } else if ( type === "integer" ) {
+    } else if (type === "integer") {
       let err = validateInteger(value)
       if (!err) return errors
       errors.push(err)
-    } else if ( type === "array" ) {
-      let itemType
-
-      if ( !arrayListCheck || !value.count() ) { return errors }
-
-      itemType = paramDetails.getIn(["items", "type"])
-
-      value.forEach((item, index) => {
-        let err
-
-        if (itemType === "number") {
-          err = validateNumber(item)
-        } else if (itemType === "integer") {
-          err = validateInteger(item)
-        } else if (itemType === "string") {
-          err = validateString(item)
-        }
-
-        if ( err ) {
-          errors.push({ index: index, error: err})
-        }
-      })
-    } else if ( type === "file" ) {
+    } else if (type === "array") {
+      if (!(arrayCheck || arrayListCheck)) {
+        return errors
+      }
+      if(value) {
+        value.forEach((item, i) => {
+          const errs = validateValueBySchema(item, schema.get("items"), false, bypassRequiredCheck, parameterContentMediaType)
+          errors.push(...errs
+            .map((err) => ({ index: i, error: err })))
+        })
+      }
+    } else if (type === "file") {
       let err = validateFile(value)
       if (!err) return errors
       errors.push(err)
@@ -542,6 +597,16 @@ export const validateParam = (param, value, { isOAS3 = false, bypassRequiredChec
   return errors
 }
 
+// validation of parameters before execute
+export const validateParam = (param, value, { isOAS3 = false, bypassRequiredCheck = false } = {}) => {
+
+  let paramRequired = param.get("required")
+
+  let { schema: paramDetails, parameterContentMediaType } = getParameterSchema(param, { isOAS3 })
+
+  return validateValueBySchema(value, paramDetails, paramRequired, bypassRequiredCheck, parameterContentMediaType)
+}
+
 const getXmlSampleSchema = (schema, config, exampleOverride) => {
   if (schema && (!schema.xml || !schema.xml.name)) {
     schema.xml = schema.xml || {}