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JSON Formatter & Validator

Format, validate, and minify JSON. Get clean indentation, optional key sorting, and the exact line and column of any parse error. Runs in your browser. No data sent.

146 chars
valid

How It Works

  1. 1

    Paste JSON

    An API response, a config file, a log line.

  2. 2

    Pick indentation

    2 or 4 spaces, tabs, or minify.

  3. 3

    Read the status

    Valid formats live; invalid shows line and column.

  4. 4

    Copy or download

    Grab the formatted result as text or a .json file.

Use Cases

  • Inspect API responses

    Paste a raw response and read it as clean, indented JSON.

  • Debug a parse error

    Find the exact line and column where invalid JSON breaks.

  • Normalize before diffing

    Sort keys so two payloads diff on data, not key order.

  • Minify for transport

    Collapse JSON to one line for env vars, configs, or URLs.

Frequently Asked Questions

It parses your JSON in the browser and re-emits it with clean, consistent indentation. If the JSON is invalid, it tells you what went wrong and where (line and column). You can also minify or sort keys.
Yes. Formatting and validation are the same step: the tool runs a real `JSON.parse`. Valid input formats instantly; invalid input shows the parser error with the line and column of the first problem.
Pick "Minify" from the indent dropdown. The output collapses to a single line with no whitespace, ready to embed in a config, query string, or environment variable.
It reorders every object's keys alphabetically, recursively. Two JSON documents with the same data but different key order will then format identically, which makes them diff cleanly.
No. Parsing, formatting, and validation happen entirely in your browser. No network calls, no storage, no logging.
Yes, within your browser's memory. It works well for typical API responses and config files. Multi-megabyte documents may feel slow because everything runs client-side.

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