JSON Formatter & Validator

Paste JSON to format and validate it. Valid input comes back pretty-printed with your choice of indent, plus a minified copy and stats like key count, nesting depth, and size. Invalid input gets a syntax error message instead, so you know it's broken before it hits your parser.

JSON Input Required

Advanced options

Indent Spaces Optional

Sort Keys Optional

Minify Optional

Get an API key to automate this

Result

Code snippets

What this tool checks

Pretty-print with 0 to 8 space indent
Minified output in the same response
Optional recursive key sorting
Syntax error reporting for invalid JSON
Stats: keys, depth, size, and value type counts

Automate this with the API

Run this tool programmatically from your code. Get a free temporary API key with 20 requests/day — or register for 75 requests/day.

                                                            curl -X POST https://apixies.io/api/v1/json/format \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input": "..."}'
                                    

Get Temporary API Key View API Documentation →

Frequently asked questions

Why does my JSON fail to validate?

The usual suspects are trailing commas, single quotes instead of double quotes, unquoted keys, and comments. All of those are fine in JavaScript but not in JSON. The error message tells you what kind of problem the parser hit.

What does sort keys do?

It orders object keys alphabetically at every level. Array order isn't touched. Sorted output is handy for diffing two JSON files, since the same data then always prints the same way.

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