Once I was working with an api that used mongodb in the back. Mongo uses very large integers as ids and I was looking at the json generated through a json viewer extension in the browser. I was having problems because I couldn't find the document I was looking at in the database. Turns out, the viewer used the browser's JSON.parse and that was converting the id to a number and losing precision since it was so large. Ever since, I prefer to look at json raw first and then use formatters just to look at the shape, not the data.