JSON Formatter & Validator

Beautify, minify, validate, and repair JSON online without uploading your data.

Runs in your browser — nothing is uploaded.

How to use this tool

1. Paste JSON into the input panel.
2. Format to beautify, minify to compress, or use one-click repair for trailing commas and similar syntax issues.
3. Copy the result. Invalid JSON is highlighted by line when you format.

Good to know

• Repair only fixes syntax (quotes, commas, brackets). It does not change field values.
• Need a log line or env value? Send formatted JSON through String to One Line next.

Beautify, validate, and repair run locally so API samples and tokens never have to leave your machine.

Next task

• String to One Line
• Text Diff
• Test Data Generator
• All tools