Readable formatting and compact transport serve different purposes.
Quick answer
Strict JSON is parsed by JSON.parse; valid output is generated with JSON.stringify.
Whitespace
Strict JSON is parsed by JSON.parse; valid output is generated with JSON.stringify. In this context, whitespace matters because the output should match the task rather than simply produce a file or string. Review the result against the original input and keep an untouched copy when the workflow changes a file.
Size
Strict JSON is parsed by JSON.parse; valid output is generated with JSON.stringify. In this context, size matters because the output should match the task rather than simply produce a file or string. Review the result against the original input and keep an untouched copy when the workflow changes a file.
Debugging
Strict JSON is parsed by JSON.parse; valid output is generated with JSON.stringify. In this context, debugging matters because the output should match the task rather than simply produce a file or string. Review the result against the original input and keep an untouched copy when the workflow changes a file.
Practical example
Use the matching Get Tools Lab Json Formatter tool with a small, non-sensitive example first. Confirm the expected result before using a larger or important input.
Privacy and limitations
Processing behavior depends on the tool. Priority browser-local tools identify that behavior on the tool page. A local browser workflow reduces server upload exposure, but it does not remove the need to protect the source file, device and downloaded result.
Related workflow
Open Json Formatter. You can also use the related comparison, glossary and topic pages to understand the format and trade-offs.