JSON
Format, minify, validate and inspect JSON data
Frequently Asked Questions
What is a JSON formatter?
A JSON formatter takes raw, minified, or messy JSON and adds proper indentation and line breaks so humans can read it. It doesn't change the data — just the visual presentation.
Is this JSON validator strict?
Yes. It validates against the official JSON specification (RFC 8259). Trailing commas, single quotes, unquoted keys, and comments are all flagged as invalid — because they are not valid JSON, even if some parsers accept them.
Does formatting change my JSON data?
No. Formatting only adds or removes whitespace. The underlying data structure, values, and key order remain identical. Minification does the reverse — removes whitespace without altering data.
Is my JSON uploaded to a server?
No. All formatting, validation, and minification happens locally in your browser using JavaScript. Your data never leaves your machine.
What is the maximum JSON size I can format?
The tool handles files up to several megabytes comfortably. Performance depends on your browser, but typical API payloads format in under 50ms.
What does the tree view do?
The tree view converts your JSON into a collapsible, explorable structure. You can expand and collapse individual nodes to navigate deeply nested objects without getting lost in brackets.
JSON Formatter & Validator: Format, Lint & Beautify JSON Online
Raw, minified, or messy JSON data is taken by this JSON formatter and transformed into clean, readable output with proper indentation. JSON can be pasted to have its syntax validated, structure beautified, or output minified for production. Errors are caught in real-time with exact line numbers — trailing commas, unquoted keys, mismatched brackets — all flagged before runtime issues occur. This tool is sometimes referred to as a JSON linter or jsonlint. Everything is processed in your browser, so your data stays private.
How is JSON validation done?
When JSON is pasted into the editor, the syntax is checked against the official JSON specification (RFC 8259). Common mistakes are caught — trailing commas, unquoted keys, single quotes instead of double quotes, and mismatched brackets. The error message points to the exact line and character where the problem was found.
When should JSON be minified?
Minification strips all whitespace, newlines, and indentation from JSON without changing the data. This reduces file size — often by 30-60% — which matters when JSON is sent over a network or stored in a database. Minified JSON is harder for humans to read, but machines don't care about formatting.
Tree view for complex structures
Deeply nested JSON is hard to navigate as raw text. The tree view turns your JSON into a collapsible, explorable structure where individual nodes can be expanded and collapsed. This makes it much easier to understand the shape of your data without getting lost in brackets.