JSON Formatter
A fast JSON formatter and validator. Pretty-print, minify, or fix broken JSON in your browser.
A fast JSON formatter and validator. Pretty-print, minify, or fix broken JSON in your browser.
Supported formats
How to use JSON Formatter
- 1
Paste your JSON into the editor.
- 2
Click 'Format' to pretty-print, or 'Minify' to shrink.
- 3
Copy the result or download it as a .json file.
Real examples of JSON Formatter in action
{"user":{"id":42,"name":"Ada","roles":["admin","editor"]}}{
"user": {
"id": 42,
"name": "Ada",
"roles": ["admin", "editor"]
}
}A config file with 2-space indent across 40 lines
Single-line minified JSON (28% smaller payload)
{"name": "test", "age": 30,}Error at line 1, column 28: Unexpected token } (trailing comma)
Who is JSON Formatter for?
Backend developers debugging malformed API responses during integration
Frontend engineers pretty-printing JSON configs like tsconfig.json and package.json
DevOps engineers minifying JSON payloads before embedding in Kubernetes manifests
QA testers inspecting webhook payloads and saved fixture files
Data analysts reformatting exported JSON datasets for readability
Why use JSON Formatter?
- Instant validation with clear error messages and line numbers.
- Configurable indent (2, 4, or tab).
- Works on JSON files of any size your browser can handle.
Common use cases
- Debug an API response.
- Reformat config files for readability.
- Shrink JSON before shipping it in production.
How JSON Formatter keeps your data private
JSON parsing uses the native JavaScript JSON.parse and JSON.stringify methods inside your browser — no data ever reaches a server, and nothing is logged. Production API responses containing user PII, internal service secrets, or customer data can be safely formatted without risking exposure through a third-party proxy.
How JSON Formatter compares to alternatives
Honest comparison to other popular options — pick the right tool for the job.
| Tool | Main limitation |
|---|---|
| JSONLint | Posts the JSON to their server for validation, exposing any sensitive API data |
| JSONFormatter.org | Covered in ads and trackers that slow down the formatting workflow |
| VSCode built-in | Requires opening the IDE and creating a temporary .json file for a quick check |
| jq CLI | Requires installation and command-line comfort for a basic pretty-print |
| JSON Formatter | Free, runs in your browser, no sign-up, no watermarks, no file-size limits beyond your device memory. |
Limitations & things to know
- Strict JSON only — trailing commas and single quotes are not valid JSON
- Very large files (50MB+) may cause browser tab to slow down
- Does not validate JSON Schema, only syntax
About JSON Formatter
A JSON formatter is one of the most-used developer tools in the world — every API response, config file, and database export passes through one at some point. Xevon Tools' JSON Formatter validates your JSON, pretty-prints it with configurable indentation, minifies it for production, and shows clear errors when something is wrong. Because everything runs in your browser, even sensitive API responses stay completely private.
Frequently asked questions
Helpful tutorials
Practical guides that show real workflows for this tool and related tasks.
Your files never leave your device
Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.
Embed JSON Formatter on your site
Add this tool to your own website, blog, or internal tool page with one line of code. Free to use, no attribution required (but appreciated).
<iframe src="https://www.xevontools.com/embed/json-formatter" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px;" title="JSON Formatter — Xevon Tools"></iframe>