diff --git a/src/types/errors/InvalidJsonError.ts b/src/types/errors/InvalidJsonError.ts
new file mode 100644
index 0000000..f59339a
--- /dev/null
+++ b/src/types/errors/InvalidJsonError.ts
@@ -0,0 +1,7 @@
+export class InvalidJsonError extends Error {
+  constructor() {
+    super('Error: invalid Json string')
+    this.name = 'InvalidJsonError'
+    Object.setPrototypeOf(this, InvalidJsonError.prototype)
+  }
+}
diff --git a/src/types/errors/JsonParseArrayError.ts b/src/types/errors/JsonParseArrayError.ts
new file mode 100644
index 0000000..9006f64
--- /dev/null
+++ b/src/types/errors/JsonParseArrayError.ts
@@ -0,0 +1,7 @@
+export class JsonParseArrayError extends Error {
+  constructor(public message: string) {
+    super(message)
+    this.name = 'JsonParseArrayError'
+    Object.setPrototypeOf(this, JsonParseArrayError.prototype)
+  }
+}
diff --git a/src/types/errors/WeboutResponseError.ts b/src/types/errors/WeboutResponseError.ts
new file mode 100644
index 0000000..9ca1e80
--- /dev/null
+++ b/src/types/errors/WeboutResponseError.ts
@@ -0,0 +1,7 @@
+export class WeboutResponseError extends Error {
+  constructor(public url: string) {
+    super(`Error: error while parsing response from ${url}`)
+    this.name = 'WeboutResponseError'
+    Object.setPrototypeOf(this, WeboutResponseError.prototype)
+  }
+}
diff --git a/src/types/errors/index.ts b/src/types/errors/index.ts
index cca1a97..e2b0766 100644
--- a/src/types/errors/index.ts
+++ b/src/types/errors/index.ts
@@ -8,3 +8,6 @@ export * from './NotFoundError'
 export * from './ErrorResponse'
 export * from './NoSessionStateError'
 export * from './RootFolderNotFoundError'
+export * from './JsonParseArrayError'
+export * from './WeboutResponseError'
+export * from './InvalidJsonError'