Node.js encountered an abrupt conclusion in the JSON input that was not anticipated

Upon receiving Json data as post data in my node.js server, I encountered an issue with parsing the string.

Here is a snippet of my node.js server code:

res.header("Access-Control-Allow-Origin", "*");
  req.on('data',function(data)
  {
    var done=false;
    console.log(data);
    var schema;

    schema=JSON.parse(data);
   }

An error occurs when attempting to parse the json data:

undefined:776

SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at IncomingMessage.<anonymous> (/Users/as6/Documents/test/server.js:206:17)
    at emitOne (events.js:115:13)
    at IncomingMessage.emit (events.js:210:7)
    at IncomingMessage.Readable.read (_stream_readable.js:462:10)
    at flow (_stream_readable.js:833:34)
    at resume_ (_stream_readable.js:815:3)
    at _combinedTickCallback (internal/process/next_tick.js:102:11)
    at process._tickCallback (internal/process/next_tick.js:161:9)

I confirmed the JSON data's syntax using JSONLint and it was error-free. I'm unsure about what may be causing this issue or how to resolve it.

jsonnode.jsexpressnpm

Answer №1

Information may trigger several events, requiring you to gather all the data values and combine them once the end event is triggered:

let pieces = [];

req.on('details', function(data) {
  pieces.push(data);
}).on('finish', function() {
  let details   = Buffer.concat(pieces);
  let structure = JSON.parse(details);
  ...
});

Consider using body-parser as an alternative solution.

Answer №2

Modification needed on this line

currentSchema = JSON.parse(data);

Change it to

currentSchema = JSON.parse(JSON.stringify(data));

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