Get "Value" from simple JSON using "Key" as variable Azure Logic Apps

Question

I have defined a simple JSON

{
  "12345": "Numbers",
  "AAAAA": "AllAs",
  "ABCXYZ": "AtoZ"
}

All I want to extract the value of "Key" when passed as a variable. I have tried body('Parse_JSON')['name'] but its failing.

I just want to get the value of what ever Key I am looking for as variable.

Answer 1

As per your comment as you are initializing ABCXYZ value and that you have already declared in inputs you can just type ABCXYZ in value rather than calling Name variable

Answer 2

Figured it !

body('parse_JSON')?[variables('name')]

The above does the following:

1- body('parse_JSON') gets the body of Parsed JSON

2- ?[variables('name')] gets the value of name which is equal to ABCXYZ

3- Returns AtoZ

Answer 3

For those also just starting with logic apps - if its not immediately apparent;

At "Initialize Variable 2" you need to use the "Expression" tab to input the line

body('parse_JSON')?[variables('name')]

Answer 4

I just want to add something here as I was looking for a way to use a dynamics value passed in to then use that to look up in a json body to translate that value to a different.

Mapping value eg. {"male":"M", "female":"F", "Non-Specific":"O"}

So I receive the value "Male" but I need that to return as M

to achieve this in a logic app the above partially gets you there.

body('Parse_JSON_gender_mapping')?[string(variables('received_gender'))]

I had to wrap my use of the variable for the value we received in string() function, even though the value was a string.