JSON Formatter & Validator
Format, validate, beautify, and minify JSON code instantly in your browser. Highlights syntax errors, collapses tree nodes, and cleans ugly JSON strings.
Paste JSON
Then tap Format.
Tree appears here
Format valid JSON to view it.
How do you pretty print unformatted JSON?
Paste your raw JSON string into ToolJi's JSON Formatter and click 'Format JSON'. It will instantly indent and colorize your JSON code.
What is JSON Formatter & Validator?
A JSON Formatter takes raw, unformatted, or minified JSON strings and parses them into a human-readable, indented tree layout with syntax color highlighting and error validation.
Who Needs It?
Software developers, API engineers, data analysts, and web developers working with REST APIs, database payloads, or configuration files.
Problem Solved
Eliminates time spent squinting at messy single-line API responses and identifies missing commas, unescaped quotes, or syntax errors instantly.
How to Format and Beautify JSON Code
- 1
Paste Raw JSON
Paste your unformatted or minified JSON string into the editor box.
- 2
Click Format
Click the Format JSON button to pretty print with 2-space or 4-space indentation.
- 3
Check Validation
Review syntax error alerts if the JSON string is malformed.
- 4
Copy or Download
Copy the clean beautified JSON or download it as a .json file.
Common Uses for JSON Formatter
Debugging REST API responses and GraphQL data payloads.
Formatting configuration files (package.json, tsconfig.json, settings.json).
Validating JSON structure before sending requests in Postman or cURL.
Minifying JSON payloads to reduce bandwidth consumption in production APIs.
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Frequently Asked Questions
Is my JSON data uploaded to a server?
No. All JSON formatting, parsing, and validation run 100% locally in your browser JavaScript context.
Can I minify JSON to remove whitespace?
Yes, you can toggle between Beautify (indented) and Minify (compressed single-line) modes.
What happens if my JSON has syntax errors?
The validator highlights the exact line number and character position of the syntax error so you can fix it immediately.
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