JSONFix is a free online JSON formatting and repair tool designed to help users quickly handle corrupted or badly formatted JSON data. The tool requires no registration; after pasting JSON content and clicking the format button, users can instantly get a formatted output result.
Its main capabilities include four basic operations: formatting, validation, minification, and repairing corrupted JSON. Among these, the AI repair feature is powered by Claude and is specifically used to fix common errors that cause JSON.parse() to throw errors.
According to the official description, JSONFix can fix the following issues: missing or extra commas, use of single quotes instead of double quotes, unquoted property names, comments included in JSON (which are invalid in strict JSON), trailing commas after the last element, missing square brackets or curly braces, and truncated or incomplete JSON.
It is simple to use: open the webpage, paste the JSON content, click format, and get the cleaned output. The whole process is free, and no account needs to be created.
Use cases include: quickly fixing syntax errors when JSON strings manually assembled during development or extracted from logs contain errors; validating format after copying content from API responses or configuration files; and minifying JSON to reduce size.
In terms of limitations, the official materials do not state limits on JSON size, nesting depth, or number of fields, nor do they mention other paid or premium features besides AI repair. Details about data privacy, whether user input is stored, and supported file uploads are not currently provided.
