JSON Formatter
Turn unreadable JSON into properly indented, readable structure.
Runs entirely in your browser — your data is never uploaded to any server.
How it works
- Paste your JSONMinified or messy — it does not matter.
- Choose indentationTwo spaces, four spaces or tabs.
- Copy the resultCopy to clipboard or download as .json.
What this tool does
- Precise error reporting with line and column
- Optional alphabetical key sorting
- Two-space, four-space and tab indentation
- Nothing is sent anywhere — safe for production payloads
Frequently Asked Questions
No. Parsing and formatting happen in your browser, so API responses containing real data stay on your machine.
The usual culprits are trailing commas, single quotes instead of double quotes, and unquoted keys. The error message points at the exact position.
Several megabytes format without trouble. Beyond that your browser may take a noticeable pause.
No. JSON objects are unordered by definition, so sorting only affects how they read.
Privacy and security
Your input is processed by JavaScript running inside your browser. Nothing you paste is sent over the network, logged, or stored — which is what makes this safe to use with production data. If you want to check this yourself: open your browser’s developer tools, switch to the Network tab, and use the tool — you will see no request carrying your file or input leave the page.
Related tools
View all tools →JSON ValidatorCheck whether your JSON is valid, and find out exactly why it is not.JSON MinifierStrip every unnecessary byte from your JSON.JSON BeautifierExpand minified JSON into something a human can actually read.YAML FormatterFormat, validate and convert YAML.XML FormatterIndent and check XML documents.