سهلSahel

JSON Formatter & Validator

Format and validate JSON, with the error pinned to a line and column

calendar_today Last updated: September 17, 2026

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Valid JSON.

Formatted

{
  "name": "سهل",
  "tools": 80,
  "free": true,
  "tags": [
    "json",
    "dev"
  ]
}

Formatted in your browser — nothing is uploaded. Numbers and strings are copied through exactly as written, so long IDs keep every digit.

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Sahel's JSON formatter indents, minifies and validates JSON, pins any syntax error to a line and column, and copies numbers and strings through verbatim — all inside your browser.

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How does this tool work?

1

Paste your text

Drop JSON into the box, or type it in.

2

See the error or the result

An error is pinned to a line and column; otherwise the formatted text appears.

3

Copy what you need

Take the formatted or the minified version in one click.

Frequently asked questions

Does the formatter change my numbers? expand_more
No. Numbers are copied through exactly as written, so 1e3 does not become 1000 and a twenty-digit ID does not lose its last digits — which is what happens in tools that parse and re-serialise.
Why does it say “trailing comma” when my file works? expand_more
Some languages allow a comma before the closing bracket, but the JSON standard itself does not. If your file is config for a lenient tool that is fine; if it is going to be sent as JSON, the other end will reject it.
Is my file uploaded anywhere? expand_more
No. Formatting and validation both happen in your browser, so the text never leaves your device.
What is the difference between formatting and minifying? expand_more
Formatting adds spaces and line breaks to make the file readable by a person; minifying strips all of them so it is as small as possible to send over a network. The content itself is identical either way.

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