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Format, validate, prettify, and minify JSON payloads with syntax error detection.
The JSON Formatter validates, beautifies, and minifies JSON (JavaScript Object Notation) data structures in real time. It parses input strings, highlights syntax errors with line numbers, formats unreadable compressed payloads with custom indentation, and produces clean JSON for debugging APIs.
Accepts raw text or JSON strings of arbitrary length. Handles nested objects, arrays, strings, numbers, booleans, and null values.
Outputs formatted, syntax-highlighted JSON text, validation error banners with specific character offsets, one-click clipboard copy, and file download.
Input: {"id":101,"name":"Alex","active":true,"roles":["admin","editor"]}
Operation: Click 'Format' with 2-space indentation selected.
Output: {\n "id": 101,\n "name": "Alex",\n "active": true,\n "roles": [\n "admin",\n "editor"\n ]\n}
Want a deep dive into JSON syntax rules and common errors? Read our beginner-friendly tutorial on How to Format JSON.
JSON parsing and formatting is performed strictly via native browser JSON.parse and JSON.stringify methods. Proprietary payloads or API tokens pasted into the tool remain 100% private in device memory.
Strict JSON syntax rules apply: keys must be enclosed in double quotes, and trailing commas are flagged as syntax errors per RFC 8259.
When invalid JSON is detected, the built-in parser catches the error and displays a banner detailing the error description and line position.
Yes. Clicking the 'Minify' button strips all indentation, spaces, and line breaks, compressing the JSON to its minimal byte size.
Because processing runs entirely in your browser's V8/SpiderMonkey engine, you can format multi-megabyte payloads comfortably up to browser memory limits.