remove deprecated circular-json

README.md

@@ -76,7 +76,7 @@ APIKEY=
 
 Obtain the APIKEY by taking out a contract on the `chatbot-api` service on [api-store.antwerpen.be](https://api-store.antwerpen.be). The ACCESS_TOKEN value can be obtained at the bottom of the settings screen ("API token") on [chatbots.antwerpen.be](https://chatbots.antwerpen.be).
 
-(Add `-o` or `-a` extensions where needed to the host names to access the dev or acceptation environments.)
+(Add `-o` or `-a` extensions where needed to the host names to access the development or acceptance environments.)
 
 Run the service:
 

example/helpers/circularJson.ts

@@ -0,0 +1,24 @@
+// encode to JSON while dealing with circular references
+// adapted from https://stackoverflow.com/a/11616993/20980
+const stringify = (o: any) => {
+  const cache: any[] = [];
+  return JSON.stringify(o, (key, value) => {
+    if (typeof value === 'object' && value !== null) {
+      if (cache.indexOf(value) !== -1) {
+        // Duplicate reference found
+        try {
+          // If this value does not reference a parent it can be deduped
+          return JSON.parse(JSON.stringify(value));
+        } catch (error) {
+          // discard key if value cannot be deduped
+          return;
+        }
+      }
+      // Store value in our collection
+      cache.push(value);
+    }
+    return value;
+  });
+};
+
+export { stringify };

example/middleware/error.middle.ts

@@ -1,6 +1,6 @@
 import { Request, Response, NextFunction } from 'express';
 // some errors have circular references, avoid errors when encoding them
-import JSON = require('circular-json');
+import {stringify} from '../helpers/circularJson';
 export default (err: any, req: Request, res: Response, next: NextFunction) => {
   res.setHeader('Content-Type', 'application/json');
   if (err.name === 'ValidationError') {
@@ -14,10 +14,10 @@ export default (err: any, req: Request, res: Response, next: NextFunction) => {
   }
   if (err.name === 'ChatBotError') {
     const status = err.status || 500;
-    return res.status(status).send(JSON.stringify(err));
+    return res.status(status).send(stringify(err));
   }
   if (err.status) {
-    return res.status(err.status).send(JSON.stringify(err));
+    return res.status(err.status).send(stringify(err));
   }
-  return res.status(500).send(JSON.stringify(err));
+  return res.status(500).send(stringify(err));
 };

package.json

@@ -26,7 +26,6 @@
     "@types/joi": "^13.0.8",
     "axios": "^0.18.0",
     "body-parser": "^1.18.3",
-    "circular-json": "^0.5.9",
     "cors": "^2.8.4",
     "dotenv-safe": "^5.0.1",
     "express": "^4.16.3",
@@ -37,7 +36,6 @@
     "typescript": "^2.8.3"
   },
   "devDependencies": {
-    "@types/circular-json": "^0.4.0",
     "@types/cors": "~2.8.3",
     "@types/dotenv-safe": "~4.0.1",
     "@types/express": "^4.11.1",