how to auto "prettify" json files

[kristiankauffeld]

When storing new session cookie, the json is written to the file on one line, ex.:

versus this much more readable format:

Is it possible to insert the json data, so that it's automatically formatted with spaces?

[BillyWM]

Have you tried passing an "encoder" method in the options? Docs say it defaults to json.stringify, which, without options, will not have spacing, but can take a space parameter. You could pass a simple function as the encoder like:
(x) => JSON.stringify(x, null, 4)