CODEWITHSUNDEEP
javascriptjsonnode.jsobject
made_in_india
made_in_india

Reputation: 2279

parse JSON object with value passed as single quote string

I an getting aws event parameter as follow in the lambda call. let event = { pathParameters: '{"foo":"35314"}' }

When I am trying to validate the parameter in condition , it cant find foo key on pathParameters

Here my condition check

if (event.pathParameters && event.pathParameters.foo) {
   //do something
} else {
   console.log('fail');
}

It going in else condition . I tried JSON.parse(JSON.strinify(event)). It did not help. I do get the Object if I do JSON.parse(event.pathParameters). Any way to resolve the issue on root level object.

Upvotes: 1

Views: 703

Answers (4)

Asons
Asons

Reputation: 87262

No, you can't parse the event to get access to the '{"foo": "35314}'", you need to parse the event.pathParameters value to get the actual foo and its value, 35314

let event = { pathParameters: '{"foo":"35314"}' }

if (event.pathParameters && JSON.parse(event.pathParameters).foo) {
   console.log("'foo' =", JSON.parse(event.pathParameters).foo);
} else {
   console.log('fail');
}

Upvotes: 3

Muhammad Usman
Muhammad Usman

Reputation: 10148

This is because the data that you are getting has JSON as stringified in pathParameters, so you'll have to parse with that key something like

JSON.parse(event.pathParameters).foo

Upvotes: 1

Vivek
Vivek

Reputation: 1523

function doSomething(event) {
  let pathParametersObj = JSON.parse(event.pathParameters);
  if (pathParametersObj && pathParametersObj.foo) {
    //do something
    console.log('pass');
  } else {
    console.log('fail');
  }
}

let event1 = {
  pathParameters: '{"foo":"35314"}'
}

let event2 = {
  pathParameters: null
}

doSomething(event1);
doSomething(event2);

Upvotes: 0

Naftali
Naftali

Reputation: 146350

let event = { pathParameters: '{"foo":"35314"}' } // foo is a string

if (event.pathParameters) {
   try {
      const { foo } = JSON.parse(event.pathParameters);
      // use foo
   } catch (jsonError) {
     console.log('There was some json parse error', jsonError);
   } 
} else {
   console.log('fail');
}

You need to parse the data from event.pathParameters

Upvotes: 0

Related Questions