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Format, validate and minify JSON
JSON Formatter is a browser-based tool that instantly prettifies, minifies, and validates JSON without sending anything to a server. Paste raw JSON from an API response, a config file, or a log dump and the formatter adds proper indentation, colorizes keys, strings, numbers, booleans, and null values, and flags syntax errors with the exact line and character position. Toggle between a readable 2-space or 4-space indented view and a compact single-line minified form. Developers use it when reading third-party API payloads, debugging webhook bodies, preparing configuration snippets for documentation, or confirming that a hand-edited JSON file is valid before committing. Because all processing happens in your browser using the native JSON engine, no data ever leaves your machine — critical when working with tokens, credentials, or user-identifiable content.
The formatter pinpoints the exact line and character where your JSON breaks — a missing comma, an unquoted key, or a trailing bracket — so you fix the real problem in seconds instead of scanning hundreds of lines manually.
Switch between human-readable indented output and a stripped single-line payload with one click. This is essential when you need to read an API response locally but must send a compact body in a production request.
Keys, string values, numbers, booleans, and null values each render in distinct colours, making deeply nested structures readable at a glance without a full IDE or browser DevTools open.
All parsing runs inside your browser's native JSON engine. Credentials, auth tokens, private API responses, and PII never leave your device — unlike cloud-based formatters that log or cache submitted payloads.
The tool parses deeply nested arrays, mixed-type objects, and Unicode strings without truncating output. Useful for large GraphQL responses or bulk export files that would lag in a basic text editor.
A dedicated copy button captures the entire formatted or minified output instantly, including accurate indentation, so you can paste clean JSON directly into a code editor, Slack message, or ticket without extra steps.
Input: {"user":{"id":1,"name":"Alice","roles":["admin","editor"]}}
Output: { "user": { "id": 1, "name": "Alice", "roles": [ "admin", "editor" ] } }
Input: {"host":"localhost","port":5432,}
Output: Error on line 1, col 31: Unexpected token } — trailing comma after last property is not valid JSON.
Input: { "debug": false, "timeout": 30, "retries": 3 }
Output: {"debug":false,"timeout":30,"retries":3}