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JSON Formatter & Validator
Free online JSON formatter — format JSON, validate JSON, pretty print, and minify JSON instantly in your browser. JSON beautifier and validator with tree view. No signup, 100% private.
Paste your JSON here
Paste any JSON above and click Format to visualize it.
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What this JSON formatter accepts
The formatter uses the browser’s native JSON parser, so the input must be valid JSON rather than a JavaScript object literal. Property names require double quotes, trailing commas are invalid, and comments are not part of the JSON standard.
After parsing, the tool can pretty-print or minify the value and display nested objects and arrays as a collapsible tree. The key count, depth, and size shown on the page describe the parsed value, not the original source formatting.
- Use the error message to locate malformed quotes, commas, or brackets.
- Use Raw view when you need to copy the formatted JSON exactly.
- The JSON stays in the browser and is not sent to a server.
Why Use This JSON Formatter & Validator?
- 🌲 Tree View — JSON viewer with collapsible nodes — explore nested structures easily
- ✅ JSON Validator — Validate JSON online with instant error highlighting — JSON checker online that pinpoints syntax issues
- 💅 JSON Beautifier — JSON beautifier online — pretty print JSON to clean, readable indented format
- ⚡ JSON Minifier — Minify JSON online — compress JSON to the smallest valid format for APIs and network payloads
- 📋 Copy & Download — Copy formatted JSON to clipboard or download as .json file instantly
- 🔒 100% Private — Free JSON formatter — your data never leaves the browser, no upload to any server
How to Format JSON Online Free
- 1Paste your raw, minified, or malformed JSON into the input box.
- 2Click "Format JSON" (or press Ctrl+Enter) to parse, validate, and pretty print JSON.
- 3Switch between Tree view (JSON viewer) and Raw view to explore your data.
- 4Click any object or array node to collapse or expand it.
- 5Use Copy to copy formatted JSON, or Download to save as a .json file. Use Minify to compress JSON.
Frequently Asked Questions
- Is this JSON formatter free?
- Yes — completely free. This free JSON formatter requires no signup and has no usage limits. Format, validate, and beautify as much JSON as you need.
- How do I format JSON online?
- Paste your JSON into the input box and click Format JSON. The online JSON formatter parses your data, indents it with 2 spaces, and displays it as a readable tree. This is the fastest way to format JSON online free.
- How do I validate JSON online?
- Paste your JSON and click Format JSON. If the JSON is invalid, the validator displays the exact error message from the JavaScript parser — making this JSON validator online a quick way to find and fix JSON syntax errors.
- What is JSON beautifier / JSON pretty print?
- A JSON beautifier (also called JSON pretty print or JSON prettify) takes compact or minified JSON and adds indentation and line breaks to make it human-readable. This online JSON beautifier produces cleanly indented output you can read and navigate easily.
- How do I minify JSON online?
- After formatting your JSON, click the Minify button. The JSON minifier removes all whitespace and line breaks, producing the most compact valid JSON string. This is useful for reducing payload size when sending JSON over a network or embedding JSON in code.
- What is the difference between a JSON formatter and a JSON parser?
- A JSON parser reads JSON text and converts it into a data structure (object/array). A JSON formatter takes that parsed data and renders it in a readable indented layout. This tool does both — it parses the JSON and then formats it for display.
- Is my JSON data sent to a server?
- No. All parsing, formatting, and validation happens entirely in your browser using JavaScript. Your JSON data never leaves your device — this free online JSON formatter is 100% private.
- What is the maximum JSON size supported?
- There is no hard limit imposed by this JSON formatter and validator tool. Performance depends on your browser's JavaScript engine — most modern browsers handle files up to several MB without issues.
- Can this check JSON format errors?
- Yes. This JSON checker online highlights syntax errors immediately when you click Format. The error message shows the exact position of the problem, making it easy to locate and fix malformed JSON.