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Not really a TIL, but more a knack: stringify an object containing circular references:

const safeStringify = (obj, indent = 2) => {
let cache = [];
const retVal = JSON.stringify(
obj,
(key, value) =>
typeof value === "object" && value !== null
? cache.includes(value)
? undefined // Duplicate reference found, discard key
: cache.push(value) && value // Store value in our collection
: value,
indent,
);
cache = null;
return retVal;
};

Use like:

console.log(safeStringify(event));

From here.