JSON Formatter & Validator
Beautify, minify and validate JSON.
- 100% free
- No sign-up
- Runs in your browser
Readable JSON in one paste
Paste a squashed API response and get it indented and readable, or minify JSON to save bytes. Invalid JSON gets a clear error message.
Sorting keys alphabetically makes two JSON documents much easier to compare.
- 1
Paste JSON
From an API, log or file.
- 2
Pick a style
Indent, tabs or minify.
- 3
Copy or download
As formatted .json.
Frequently asked questions
Why is my JSON invalid?
The usual suspects are trailing commas, single quotes instead of double, and unquoted keys — all fine in JavaScript but not in JSON.
Is it safe for API keys or tokens?
Yes. Nothing leaves your browser, but avoid pasting secrets into any website you don't trust.
Is my data uploaded anywhere?
No. Everything runs in your browser with JavaScript — nothing you type or open is sent to our servers.