What does a JSON formatter do?

A JSON formatter takes minified or messy JSON and adds indentation and line breaks so it is easy to read and debug, without changing the data.

Is this JSON formatter free?

Yes. It is a free online tool. No sign-up or API key is required.

Is my JSON sent to a server?

No. Formatting and validation happen in your browser. We do not store or transmit your data.

Can it validate JSON?

Yes. The tool checks syntax and reports errors so you can fix invalid JSON.

Can I format large JSON?

Yes. The tool runs in the browser and can handle large payloads; very large files may be limited by browser memory.

json formatter — Free Online Tool | DevToolbox

A JSON formatter is a free online tool that beautifies and formats JSON (JavaScript Object Notation) so it is easy to read and debug. Minified or single-line JSON from APIs, config files, or logs can be hard to scan; a JSON formatter adds indentation, line breaks, and consistent spacing without changing the data. This JSON formatter runs entirely in your browser. Paste your JSON, and get formatted output instantly. No data is sent to any server, so you can safely format sensitive payloads. There is no sign-up or API key required. The tool is useful for developers, QA engineers, and anyone working with REST APIs, configuration files, or log output. You can also validate JSON: invalid syntax is highlighted so you can fix errors quickly. The formatter is part of our Formatters category, which includes JSON validator, JSON minifier, XML formatter, SQL beautifier, and converters like JSON to CSV and JSON to TypeScript.

How it works

1
Paste or type JSON
Paste your minified or raw JSON into the input area. You can also type or edit directly.
2
Format and validate
The tool formats the JSON with indentation and line breaks and checks for valid syntax. Invalid JSON is reported with clear errors.
3
Copy or download
Copy the formatted JSON to your clipboard or use it in your editor. No data is sent to our servers.

Use cases

Beautifying API responses for debugging
Formatting config files for readability
Validating JSON before sending to an API
Preparing JSON for documentation

Why use this tool

Free and instant; no sign-up.
Runs in the browser; data stays on your device.
Formats and validates in one step.
Handles large JSON; no arbitrary size limit for typical use.

FAQ

What does a JSON formatter do?
A JSON formatter takes minified or messy JSON and adds indentation and line breaks so it is easy to read and debug, without changing the data.
Is this JSON formatter free?
Yes. It is a free online tool. No sign-up or API key is required.
Is my JSON sent to a server?
No. Formatting and validation happen in your browser. We do not store or transmit your data.
Can it validate JSON?
Yes. The tool checks syntax and reports errors so you can fix invalid JSON.
Can I format large JSON?
Yes. The tool runs in the browser and can handle large payloads; very large files may be limited by browser memory.

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JSON Formatter