Bad control character in string literal

How the line break got there

Almost always, the JSON was built by gluing strings together instead of using a JSON library. A multi-line address, a comment from a text box, or a paragraph pasted from a document brings its line breaks along, and they land in the JSON as they are. Editing a JSON file by hand and pressing Enter inside a value does the same thing.

Fixing it where the JSON is made

Let a JSON library write the text for you. JSON.stringify and json.dumps escape every control character automatically, so the problem can’t happen. If you have to read JSON that already contains them, Python’s strict=False option will accept it:

// JavaScript: stringify escapes line breaks and tabs
JSON.stringify({ note: "line one\nline two" });   // {"note":"line one\nline two"}

# Python: json.dumps does too, and strict=False reads text that has them
json.dumps({"note": "line one\nline two"})
json.loads(text, strict=False)

To escape a single piece of text by hand, use the JSON escape tool.

The same error elsewhere