Is pasted JSON sent to a server?

No. Parsing and formatting happen locally in your browser.

Can it fix invalid JSON automatically?

It validates and points to syntax errors, but it does not guess or rewrite invalid data because that can change meaning.

WebGenAI

JSON Formatter — Validate & Beautify JSON

Paste JSON to validate it, format it with indentation, minify it for APIs, and copy clean output. Everything runs in your browser.

JSON inputOutput

75 chars · 1 lines

How to use

Step 1: Paste JSON into the editor
Step 2: Click Format to validate and beautify it
Step 3: Use Minify for compact one-line JSON
Step 4: Review any syntax error message
Step 5: Copy the formatted output

How JSON formatting works

The formatter parses your text with the browser JSON parser. Valid data can be serialized with indentation for readability or without whitespace for compact API payloads.

Frequently asked questions

It parses JSON, reports syntax errors, and outputs readable indented JSON or compact minified JSON.