Developer utility
JSON Format Studio
Format, validate, minify and inspect JSON locally in your browser. JSON (JavaScript Object Notation) is a standard text format used to store and transport data between servers and web applications.
Your input stays in the browser — nothing is sent to a server. Privacy policy.
Best for
- Developers debugging API payloads.
- Teams editing config files and fixtures.
- Anyone who needs valid JSON fast.
When to use
- Raw JSON is hard to scan and needs formatting.
- You need to validate payload syntax before sending.
- You want to minify output for transport or storage.
Input
Paste your JSON
Paste raw JSON, then prettify to read it, minify to ship it, or validate before using it.
Output
Formatted result
Run a transform and formatted JSON appears here.
Input
0 chars
Output
0 chars
Delta
0 chars
Inspect
Tree paths
After a successful transform, preview the first paths and value types without expanding a full tree.
Try this example
Paste this broken API response.
Action: Paste the broken JSON below and click Format to see how it handles missing quotes and trailing commas.
Messy input
{ status: "error", code: 500, "message": "Missing user_id", data: { "retry": true, } }
What it reveals
The formatter instantly fixes the unquoted keys (like "status" and "code") and removes the invalid trailing comma after the retry boolean. You can then use the tree view to inspect the nested object path.
Do not rely on this for: Schema validation. It ensures syntax is valid JSON, but does not verify if the payload structure matches your API spec.
FAQ
Does this JSON formatter send data to a server?
No. Formatting and validation run locally in your browser.
What is the difference between prettify and minify?
Prettify adds indentation and line breaks for readability. Minify removes extra whitespace to reduce payload size.
Can I validate JSON before sending an API request?
Yes. Use Validate to catch syntax issues like missing commas, quotes, or brackets before you ship a payload.
Found an issue or have a suggestion? Report an issue or suggest an improvement.