JSON
Fixing JSON With Unescaped Newlines in Strings Safely
A raw newline, tab or backslash inside a JSON string is invalid. See the errors Python and Node give, how strict=False helps and how to write strings safely.
8 min read
Topic
JSON
Nested, loosely typed and everywhere. Query it, flatten it, validate it and store it without losing what the nesting meant.
JSON
Why JSON Parse Fails on a Byte Order Mark and How to Fix It
A UTF-8 byte order mark in front of JSON breaks strict parsers in Python and Node. What the three bytes are, who adds them and how to read or remove them.
7 min read
JSON
Python JSONDecodeError Extra Data and Concatenated Objects
Extra data means a valid JSON value was followed by more text. Why concatenated objects and JSON Lines trigger it and three ways to read them in Python.
7 min read
JSON
Python JSONDecodeError Expecting Value Line 1 Column 1
Why json.loads or response.json() raises Expecting value at line 1 column 1 in Python, how to see what the text really is, and a checklist for each cause.
7 min read
JSON
Fixing JSON Copied From a Web Page With Smart Quotes
JSON pasted from a web page, a chat or a Word file fails on curly quotes and invisible spaces. How to spot each character and clean the text safely.
8 min read
JSON
Finding the Exact Line of a JSON Syntax Error in Any Parser
Every JSON parser reports a position in a different way. How to turn a character offset into a line, a column and a caret in Python, Node and jq.
9 min read
JSON
JSON Parse Error Single Quotes Instead of Double Quotes
JSON needs double quotes, but a Python repr or JavaScript literal uses single quotes. What each parser says, why replacing quotes breaks, and safe fixes.
6 min read
JSON
Unexpected End of JSON Input and How to Find the Cause
Unexpected end of JSON input means the text stopped too soon or was empty. Real messages for every cut point, and how to tell truncated from empty.
8 min read
JSON
Unexpected Token in JSON at Position 0 and What It Means
An unexpected token error at position 0 means the text is not JSON: usually an HTML error page, the word undefined or an unparsed object. How to tell which.
7 min read
JSONGuide
Fixing JSON Parse Errors by Reading the Message Properly
How to read a JSON parse error: what the position means in Python, Node, PHP and jq, twelve common causes, and a method that finds the bad byte fast.
18 min read
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