Fix: TypeError: Converting circular structure to JSON
Fix 'Converting circular structure to JSON' with a replacer function, and find the real source: DOM nodes, Mongoose documents, or Express request objects.
Tag: json
3 articles
RSSFix: msgspec Not Working — Struct Definition, Type Validation, and JSON/MessagePack Encoding
How to fix msgspec errors — Struct field type not supported, ValidationError on decode, msgspec vs Pydantic differences, custom type hooks, frozen Struct mutation, and JSON Schema generation.
Fix: SyntaxError: Unexpected token < in JSON at position 0
How to fix 'Unexpected token in JSON at position 0', 'JSON.parse: unexpected character', and 'Unexpected end of JSON input' in JavaScript and TypeScript. Covers API returning HTML instead of JSON, Content-Type mismatches, fetch URL typos, invalid JSON syntax, BOM characters, CORS proxies, and debugging with response.text().