JSON Convertion

Use "Content Type Converter" burp extension. It can convert between JSON, XML and Raw HTTP parameters.

Bash Method - Convert JSON to Raw HTTP Parameters

sed -e 's/[{"}]//g' -e 's/:/=/g' -e 's/,/\&/g'

Example

NOTE: The raw HTTP will not be URL encoded

echo '{"email":"[email protected]","password":"test","submit":""}' | sed -e 's/[{"}]//g' -e 's/:/=/g' -e 's/,/\&/g'

JavaScript Method - Convert JSON to Raw HTTP Parameters

1. In the browser, open up the Developers Console by pressing F12 and navigate to the Console tab
2. Enter the following JavaScript into the console

function conv(data){
let op = ""
for (const [key, value] of Object.entries(data)) {
  op+= "&"+key+"="+encodeURIComponent(value)
}
return op.substring(1)
}

3. Input the JSON code within a variable. Change it accordingly for the JSON request that should be converted

test = {"email":"[email protected]","password":"test","submit":""}

4. Call the variable you chose, in this case test, with the uploaded JavaScript parameter

conv(test)