JSON Formatter
This free online JSON formatter turns cramped, single-line JSON into readable, properly indented text the moment you paste it.
How to use
- Paste your minified or messy JSON into the editor below.
- The formatted result appears instantly with two-space indentation; invalid input reports the exact line and column.
- Read, copy or re-check the result — it stays in your browser the whole time.
Frequently asked questions
Does formatting change my data?
No. The formatter parses your JSON and re-prints it with indentation and line breaks. Keys keep their order, values keep their types and precision, and string contents are preserved byte for byte. Only whitespace between tokens is added.
What indentation does the output use?
Two spaces per nesting level, the most common convention for JSON in documentation and version control. Combined with the minifier on the JSON conversion page you can go both ways — pretty for reading, compact for transport.
Does it sort object keys or deduplicate them?
Neither. Key order is preserved exactly as it appears in your input, and duplicate keys are resolved the way the JavaScript parser resolves them: the last occurrence wins. Nothing is renamed, reordered or dropped silently.
How large a JSON file can it handle?
As much as your browser tab can hold — typically several megabytes parse instantly. There is no server-side limit because there is no server; the practical ceiling is your device memory.
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About this tool
This free online JSON formatter turns cramped, single-line JSON into readable, properly indented text the moment you paste it. It is made for reading API responses copied from a terminal, inspecting webhook payloads before wiring them into tests, diffing configuration files by eye, and pulling one value out of a minified bundle returned by a build pipeline. Formatting uses the conventional two-space indentation, quotes stay exactly where the standard puts them, and nothing else is touched: your keys keep their order, your numbers keep their precision, and your strings keep every escape sequence, because the output is a faithful re-print of the parsed value, not a rewrite. If the input is not valid JSON, the formatter fails loudly with the exact line and column of the problem instead of guessing at a best-effort result, so a broken payload never silently turns into a subtly different one. Everything runs entirely in your browser: the JSON you paste is parsed locally on your own device and never uploaded, stored or logged — safe for access tokens, customer data and private configuration. Paste your JSON below and read it like a document.