What this calculator does
The json formatter on CalcPilot turns a common developer & utility question into an instant answer — no spreadsheets, no sign-up, and no hidden assumptions.
Format and validate JSON with pretty indentation.
How to use the JSON Formatter
- Enter your input.
- The result updates automatically.
- Copy or share the result.
The formula
Parse, then stringify with indent 2.
Worked example
{"a":1} → { "a": 1 }
Common mistakes
- Trailing commas (invalid JSON)
- Single quotes
- Comments not allowed
When to use it
Use for debugging APIs and configs.
Pro tips for the JSON Formatter
- Round-trip check: reverse the inputs to confirm the formula matches what you'd compute by hand.
- Bookmark this page: the URL and inputs are all you need to reproduce the exact result later.
- Save your favorite scenarios by clicking the star icon — they're stored locally, no account needed.
Frequently asked questions
›JSON5?
Not supported here — strict JSON only.
›Minify?
Use JSON.stringify without indent.
›Validate schema?
Different tool — Ajv, Zod.
›Large files?
May be slow in browser.
›Copy result?
Use the Copy button.
›Is the JSON Formatter free to use?
Yes. Every calculator on CalcPilot, including the JSON Formatter, is free with no sign-up, no watermark, and no export limit.
›Does the JSON Formatter store the numbers I enter?
No. All math runs locally in your browser — nothing is sent to a server, and closing the tab discards the inputs unless you save them to favorites.
Embed this calculator
Drop the JSON Formatter into your own site or blog post. Free to use — a small “Powered by CalcPilot” link is appreciated.
<iframe src="https://calcpilot.tools/calculators/json-formatter?embed=1" width="100%" height="720" style="border:1px solid #e5e7eb;border-radius:12px;max-width:720px;" loading="lazy" title="JSON Formatter — CalcPilot"></iframe>Related calculators
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