Format, validate, and minify JSON code online. Instantly prettify messy JSON, fix syntax errors, and explore data in tree view, free, no signup.
The JSON Formatter validates, prettifies, and minifies JSON in real time, pinpoints syntax errors as you type, and lets you explore data in a collapsible tree view. It runs entirely in your browser, so even sensitive payloads stay on your machine.
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Prettifying adds indentation and line breaks so humans can read the structure; minifying removes every non-essential space so machines transfer it faster. Both describe the same data, you switch between them depending on whether a person or a program is the audience.
Drop in raw or messy JSON, the validator checks it instantly.
One click to indent for readability, or strip whitespace to shrink payload size.
Jump to the exact line and character the parser flags so you can correct it.
Collapse and expand nested objects and arrays to navigate large structures.
A single missing comma or stray quote invalidates an entire JSON document. Rather than telling you 'invalid JSON,' the formatter points at the precise location the parser choked on, which is usually a few characters before where you'd expect.
API responses often contain tokens, emails, or personal data. Because everything is parsed in your browser, you can format production payloads without worrying that they're being logged on someone else's server.
Paste your JSON text and click 'Format'. The tool adds proper indentation and line breaks to make it human-readable. It also validates the JSON and highlights any syntax errors.
Paste your JSON and click Validate. The tool highlights the exact line and character position of any syntax errors, missing commas, unmatched brackets, unclosed strings, etc.
Formatting (prettify) adds whitespace and indentation to make JSON human-readable. Minification removes all unnecessary whitespace to make files smaller for production APIs. Use formatted JSON for development, minified for production.
Yes. Switch to Tree View mode to explore your JSON object hierarchy interactively. You can expand and collapse nested objects and arrays, making it easy to navigate complex data structures.
No. Everything runs locally in your browser. Your JSON data never leaves your device, safe for API responses containing sensitive data.
JSON5 is a superset of JSON that allows comments, trailing commas, single-quoted strings, and unquoted keys, closer to JavaScript object literal syntax. Standard JSON is strict: no comments, no trailing commas, all keys must be double-quoted strings. This formatter validates standard JSON; JSON5 files need a dedicated JSON5 parser.
Paste your JSON and the validator points to the exact line and character where parsing failed, with a message describing what it expected (a common cause is a trailing comma or an unquoted key). Fix that spot and re-validate.
No. Formatting, validating and minifying all run in your browser, so sensitive payloads, API responses and tokens never leave the tab, which makes it safe for real production data.
Yes. Beautify re-indents JSON into readable form with proper spacing, and minify compresses it to a single line to reduce size for transport, both from the same tool.
No. Validation, formatting, and the tree view all run locally in your browser.
Paste it and the tool highlights the first syntax error with its line and column so you can fix it directly.
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