javascriptregextypescriptredaction

How to redact password in JSON using JavaScript [Typescript ES5]

I have an object that looks like this:

{
  "property1": "value1",
  "headers": {
    "property2": "value2",
    "Authentication": "Basic username:password"
  },
  "property3": "value3"
}

I need to redact password and preserve username.

From Delete line starting with a word in Javascript using regex I tried:

var redacted = JSON.stringify(myObj,null,2).replace( /"Authentication".*\n?/m, '"Authentication": "Basic credentials redacted",' )

... but this doesn't preserve the username and inserts a backslash in front of all double quotes ( " --> \").

What is the correct regex expression to react the password literal string and leave everything else intact?

Solution

  • Use the replacer argument.

    RTM: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

    Example:

    const obj = {
  "property1": "value1",
  "headers": {
    "property2": "value2",
    "Authentication": "Basic username:password"
  },
  "property3": "value3"
};

const redacted = JSON.stringify(obj, (k, v) => k === 'Authentication' ? v.split(':')[0]+':<redacted>' : v, 2)

console.log(redacted)