# json-syntax-error ![David](https://img.shields.io/david/dev-inately/json-syntax-error) ![npm bundle size](https://img.shields.io/bundlephobia/min/json-syntax-error) ![NPM](https://img.shields.io/npm/l/json-syntax-error) > Middleware to help you to catch syntax errors in JSON sent to your express server and give you a much cleaner error Ever tried sending an invalid JSON syntax to your express server when you use it with body-parser or `express.json()` and you get an ugly error at your client side? Tired of seeing your server throwing Syntax error when an invalid JSON data is forced down it's throat? ```html Error 
SyntaxError: Unexpected string in JSON at position 53
 at JSON.parse (<anonymous>)

   at parse (/home/pc/Desktop/TC/tc-sample/node_modules/body-parser/lib/types/json.js:89:19)

   at /home/pc/Desktop/TC/tc-sample/node_modules/body-parser/lib/read.js:121:18

   at invokeCallback (/home/pc/Desktop/TC/tc-sample/node_modules/raw-body/index.js:224:16)

   at done (/home/pc/Desktop/TC/tc-sample/node_modules/raw-body/index.js:213:7)

   at IncomingMessage.onEnd (/home/pc/Desktop/TC/tc-sample/node_modules/raw-body/index.js:273:7)

   at IncomingMessage.emit (events.js:327:22)

   at endReadableNT (_stream_readable.js:1220:12)
 
   at processTicksAndRejections (internal/process/task_queues.js:84:21)
``` This small middleware will help you to resolve syntax errors in your express server by allowing you to catch the error early and returning a cleaner error ```json { "status": "fail", "message": "Invalid JSON: The server is unable to process your request as it is badly malformed! } ``` ## Installing / Getting started Install via npm ```shell npm install json-syntax-error --save ``` Configuration is easy, as a, b, c. Just `require('json-syntax-error')` anywhere below your json parser (`express.json()` or `bodyParser.json()`) ```js const JSONSyntaxErr = require('json-syntax-error') ... const app = express(); ... app.use(express.json()); app.use(JSONSyntaxErr()); // That's all, really! ... ``` You can also pass in your custom response. It can be JSON, HTML, text or any format allowed by express `.send()` ```js app.use(JSONSyntaxErr({ error: 'Why are you sending a bad json?' })); // Torture their conscience! ``` or ```js app.use(JSONSyntaxErr('

Really? A bad JSON? Really?

')); // Wasn't hard, was it?! ``` ## Tests ```shell npm test ```