JSON Formatter & Beautifier
A free, browser-based JSON formatter, validator, and converter for developers. Paste any JSON to instantly beautify, minify, validate, or convert it to TypeScript interfaces, CSV, YAML, or JSON Schema — all processing happens client-side, nothing leaves your browser.
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Paste your JSON on the left
Paste, type, or upload your JSON here. It validates and formats automatically as you type.
Formatted output will appear here automatically Diff will appear here... What is JSON Formatting?
JSON (JavaScript Object Notation) is a lightweight, text-based data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. JSON formatting — also called JSON beautifying or pretty-printing — transforms compact, minified JSON into an indented, human-readable structure with proper line breaks and spacing. A JSON formatter validates the syntax, parses the data structure, and re-serializes it with consistent indentation. This is essential when debugging API responses, reading configuration files, or reviewing data from databases. Well-formatted JSON is significantly faster to scan and understand compared to minified JSON, reducing debugging time and preventing subtle syntax errors like missing commas or mismatched brackets.
How to Use This JSON Formatter
- Paste your JSON into the left input pane, or click Upload to load a .json file from your computer.
- The formatter automatically validates and beautifies your JSON in real time as you type, with syntax highlighting in the right pane.
- Switch tabs to convert your JSON: use TypeScript to generate interface definitions, CSV for spreadsheet export, YAML for Kubernetes configs, Schema to generate a JSON Schema, or JSONPath to query specific values.
- Use the Diff tab to compare two JSON documents and see exactly what changed, with added, removed, and modified keys highlighted.
- Click Share to generate a shareable URL with your JSON encoded in the hash — no data is sent to any server.
JSON vs YAML vs XML — Format Comparison
| Feature | JSON | YAML | XML |
|---|---|---|---|
| Human readable | Good | Excellent | Verbose |
| Data types | String, Number, Boolean, Null, Array, Object | Same + Dates, Binary | All strings (attributes) |
| Comments | Not supported | Supported (#) | Supported |
| File size | Compact | Compact | Verbose |
| Common use | APIs, configs, storage | Docker, Kubernetes, CI/CD | SOAP, legacy enterprise APIs |
| Browser native parse | Yes (JSON.parse) | No | Yes (DOMParser) |
Frequently Asked Questions
What is the difference between JSON and YAML?
JSON uses braces and brackets with quoted keys, making it verbose but universally supported. YAML uses indentation and is more human-readable, with support for comments and additional data types like dates. JSON is the standard for REST APIs and browser-side JavaScript; YAML is preferred for configuration files in tools like Docker, Kubernetes, and GitHub Actions. You can convert between them using the YAML tab in this formatter.
How do I validate JSON online?
Paste your JSON into the left pane of this formatter. Validation happens automatically in real time — a green "Valid JSON" indicator appears in the status bar when your JSON is syntactically correct, or a red error message with the exact line and column number of the problem appears if it is not. Common JSON errors include missing commas between key-value pairs, trailing commas after the last element, unquoted keys, and single quotes instead of double quotes.
How do I convert JSON to CSV?
Click the CSV tab in this formatter. JSON can be converted to CSV when it is an array of flat objects — meaning each element is a JSON object with only string, number, boolean, or null values (no nested objects or arrays). The formatter automatically detects the column headers from the object keys and generates a properly escaped CSV file. If your JSON has nested objects, try flattening it first or use the TypeScript tab to understand the structure.
What does JSON formatting do?
JSON formatting (beautifying) re-serializes a JSON document with consistent indentation and line breaks, making it easy to read. JSON minification does the opposite — it removes all whitespace to produce the smallest possible string, which reduces file size and speeds up network transmission. Both operations are lossless: the data is identical, only the presentation changes. This formatter supports 2-space, 4-space, and tab indentation.
What is JSONPath?
JSONPath is a query language for JSON, similar to XPath for XML. It lets you extract specific values from a JSON document using a path expression. For example, $.employees[*].name extracts all employee names from an array, and $.config..timeout recursively finds all timeout values. Use the JSONPath tab in this formatter to run queries against your JSON in real time.
Can I use this JSON formatter offline?
Yes — all processing in this JSON formatter happens entirely in your browser using client-side JavaScript. No data is sent to any server at any point. You can bookmark this page and use it without an internet connection once it has loaded, making it safe for sensitive data like API keys, personal records, or confidential configuration files.