Developer tools
JSON Formatter Online
Format, indent, and optionally sort JSON object keys locally in your browser.
Privacy note
Your text is processed in your browser. This tool does not store pasted text on a server.
When this tool helps
Use this tool to format compact JSON into readable, indented JSON.
It is intended for quick debugging, documentation examples, copied API responses, and small configuration snippets.
Common cleanup options
Readable JSON
Format compact JSON into indented output that is easier to inspect and copy.
Optional key sorting
Sort object keys when stable ordering helps compare small JSON payloads without changing parsed values.
Error handling
Invalid JSON returns a readable parse error instead of breaking the page.
Browser processing
Pasted JSON is processed locally by the current browser-based tool.
How to use it
- Paste valid JSON.
- Choose indentation and key sorting options.
- Run the formatter.
- Copy the formatted JSON for debugging, documentation, or cleanup.
Privacy, review, and limitations
The current version processes pasted text in your browser for normal use, and the page explains the tool behavior that is visible in the interface. Review the preview before copying output into another workflow, especially when the source text came from PDFs, spreadsheets, exports, or copied tables.
This text-focused formatter is not designed for very large files.
Formatting validates JSON syntax but does not verify API schemas, field meanings, or data safety.
Do not paste production secrets, tokens, or customer data unless your policy allows using browser-local tools.
Frequently asked questions
Does this format JSON in the browser?
Yes. Paste JSON, choose indentation options, and format it locally in your browser.
Can it sort object keys?
Yes. Enable the sort keys option to alphabetize object keys at every object level.
Does formatting change JSON values?
No. The formatter parses JSON and reprints it with indentation. Sorting keys changes object key order only.
Is my JSON uploaded?
No. The current tool processes pasted JSON locally in your browser.
Last updated: May 11, 2026
See the tool in action
How this page is maintained
This tool page is maintained for practical accuracy, clear limitations, browser-based processing behavior, and links to related cleanup tasks. It is intended for everyday text cleanup, not for legal, medical, financial, security, or other high-stakes decisions.
Browser-local processing
The current tool runs in the browser and does not require an account, upload, or server-side text processing for normal use.
Reviewed behavior
Examples, options, and limitations are checked against the actual tool behavior before public pages are added to the site.
Human review still matters
Text cleanup can miss source-specific issues such as broken words, malformed data, or copied table artifacts, so review important output before reuse.
Safe use checklist
- Use sample or non-sensitive text when testing a workflow.
- Check the output preview before copying it into another system.
- Keep confidential, regulated, or customer data inside approved tools.
- Use related tools only when they match the same cleanup task, not to force unrelated edits.