Developer Tools
JSON Formatter
Format readable JSON without sending the document to a server.
How to use this tool
- Paste JSON or load a local file, choose indentation, then format it.
- Review the live result and use Copy result when you need to share it.
How the transformation works
JSON.parse checks syntax and JSON.stringify creates deterministic whitespace. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.
Processing rules
JSON.parse checks syntax and JSON.stringify creates deterministic whitespace. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.
Step-by-step transformation
- Paste JSON or load a local file, choose indentation, then format it.
- JSON.parse checks syntax and JSON.stringify creates deterministic whitespace. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.
- Check the displayed result, then copy it if needed.
Worked example
A nested services object is formatted while array order remains unchanged.
Methodology and review
Who this is for
Developers reviewing or presenting JSON locally.
Inputs and units
- JSON text or local file
- Indentation and optional key sorting
Method
The browser parses input with the native JSON grammar, optionally sorts object keys, and serialises it with the selected indentation.
Worked example
A minified nested object becomes consistently indented without changing its values.
Assumptions
- Input is JSON rather than a JavaScript object literal.
- Key order has no semantic meaning to the receiving system.
Common mistakes
- Pasting JavaScript object syntax
- Assuming formatting validates an API schema
Limitations
- Formatting does not validate an external schema or preserve original whitespace.
- Large integers may exceed JavaScript's exact numeric range.
How this tool was checked
Tests cover nested arrays and objects, escaping, sorting, malformed input, and the 4 MB limit.
Reference sources
Related tools
Calculation review: 21 August 2026. Published by Goldwave Dynamics Limited. This is an internal product review, not an independent certification.
Risk guidance
Frequently asked questions
Does this tool send my inputs anywhere?
No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.
How should I use the result?
Check that the entered units and values match your situation, especially around dates, breaks, and rounding.
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