Quick answer
Understand valid JSON syntax, safe formatting, common parser errors, and a repeatable debugging workflow.
Start with validation, not appearance
Formatting can only preserve meaning when the input is valid JSON. Validate quotation marks, commas, brackets, property names, and values before relying on pretty output.
Use a repeatable workflow
- Paste or upload the data.
- Read the first parser error and its location.
- Correct one structural issue at a time.
- Format the valid result.
- Use tree search to inspect nested keys and values.
Avoid JavaScript-only syntax
JSON requires double-quoted strings and does not allow comments, trailing commas, undefined, functions, or NaN. Those features belong to JavaScript source, not JSON data.
Next step: Use the related browser tool to apply these ideas and verify the result in its destination system.
Great guide! Does local browser execution work for large files over 50MB?