Javascript parse JSON with stringify neested object

Question

I'm trying to parse a json object that an application (AWS lambda) wrote in a log file, but this json has an stringify object nested. Something like that:

input = '{"object":"{\"base\":\"brn\",\"scope\":\"all\",\"channel\":\"sve\",\"service\":\"getAssociatesCards\",\"entity\":\"consolidate\",\"attribute\":\"cRelId\",\"qualifier\":\"45430608\"}"}'

And when i try to parse it fails:

JSON.parse(input)

With this error:

SyntaxError: Unexpected token b in JSON at position 13

What can i do for fix this and get a nice Json Object?

CertainPerformance · Accepted Answer · 2020-10-09 23:01:53Z

1

If you have control over the definition of the JSON like in the code in your question, declare it with String.raw so the backslashes are interpreted as literal backslashes.

The inner object property contains more JSON, so you can parse that as well if you want:

const input = String.raw`{"object":"{\"base\":\"brn\",\"scope\":\"all\",\"channel\":\"sve\",\"service\":\"getAssociatesCards\",\"entity\":\"consolidate\",\"attribute\":\"cRelId\",\"qualifier\":\"45430608\"}"}`;
const parsed = JSON.parse(input);
console.log(JSON.parse(parsed.object));

answered Oct 9, 2020 at 23:01

CertainPerformance

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1 Comment

Andrés Over a year ago

Hi, i haven't control over the definition of the JSON. I read the JSON from a file and i'm trying to parse it.

Taplar · Accepted Answer · 2020-10-09 23:13:38Z

0

If you are reading this from some log file and you cannot control how it is defined, you could always strip out the inner json and parse it on its own.

var input = '{"object":"{\"base\":\"brn\",\"scope\":\"all\",\"channel\":\"sve\",\"service\":\"getAssociatesCards\",\"entity\":\"consolidate\",\"attribute\":\"cRelId\",\"qualifier\":\"45430608\"}"}';

var innerJSON = input.substring(11, input.length - 2);

console.log({
  object: JSON.parse(innerJSON)
});

answered Oct 9, 2020 at 23:13

Taplar

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