JSON Swiss

JSON Swiss

JSON Formatter

JSON Input

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JSON Output

Settings

Paste JSON to Format and Beautify It

Enter JSON on the left, or use Import to load from a file.

Why Use JSONSwiss’s JSON Formatter?

  1. 1

    Choose 2-space or 4-space indentation for a readable working copy.

  2. 2

    Sort object keys when stable field order makes review or diffing easier.

  3. 3

    Minify, copy, or download the result without sending JSON away from your browser.

JSON Formatter is for the point in a debugging workflow when the data is valid but difficult to inspect. It gives API responses, configuration objects, logs, and fixtures a consistent shape before you review, share, compare, or reuse them.

Format and Beautify JSON Online

Use the JSON Formatter to turn a one-line document into an indented working copy without changing its values or structure. Paste raw JSON, choose the output style, and read the resulting object hierarchy instead of manually adding spaces and line breaks.

This is especially useful when an API client, server log, queue message, or environment setting produces JSON that is technically valid but too compact to review safely. Formatting makes field names, arrays, booleans, and nested values easier to scan before a downstream change.

Pretty Print Nested JSON

The JSON Formatter applies indentation recursively, so nested objects and arrays remain grouped with the values they contain. A payload with customer, items, and metadatabranches becomes easier to trace from the top level to an individual field.

Sorting object keys can also reduce visual noise when you need a stable display order for code review or a diff. It does not validate malformed input, so validate JSON syntax first when you need a precise parser error.

Minify JSON

The JSON Formatter can switch the same valid document to minified JSON by removing unnecessary whitespace. Minified output is useful when a compact payload is headed to an API request, an environment variable, a test fixture, or storage where readable spacing is not needed.

Formatting and minifying only change presentation. If the parser cannot read the source, use repair invalid JSON rather than trying to prettify a broken document.

Use a JSON Formatter Before Reviewing Payloads

A reliable workflow is to keep the raw input, create a readable JSON Formatter output, and then decide what comes next. For example, format two API responses before comparing them, or format a recovered config after repair so that important nesting is visible to the person reviewing it.

The formatter is intentionally a presentation tool: it does not infer missing data, change data types, or decide which fields are correct. That makes it a safe first step when you need a clean view of the exact JSON you already have.

JSON Formatter Examples

Reference demo

Pretty-print a compact API response

A compact API response becomes a readable working copy without changing any keys, values, or array order.

Compact JSON
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{"customer":{"name":"Maya","plan":"pro"},"items":[{"sku":"A-12","qty":2}]}
Formatted JSON (2 spaces)
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{
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"customer": {
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"name": "Maya",
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"plan": "pro"
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},
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"items": [
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{ "sku": "A-12", "qty": 2 }
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]
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}

Change the indentation, enable key sorting, or switch to minified output when the next task needs a different presentation.

Reference demo

Sort JSON object keys for a stable review

Enable key sorting when two valid payloads use different field order and you want their shared structure to line up during review.

Original field order
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{"zebra":1,"account":{"tier":"pro","id":"c_18"},"active":true}
Sorted JSON
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{
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"account": {
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"id": "c_18",
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"tier": "pro"
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},
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"active": true,
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"zebra": 1
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}

Key sorting reorders object fields for presentation. It keeps values unchanged and does not sort arrays.

Reference demo

Minify JSON for a compact handoff

Switch a readable document back to minified JSON when a request body, environment variable, or compact fixture needs no extra whitespace.

Formatted JSON
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{
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"filters": {
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"region": "eu",
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"active": true
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},
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"limit": 25
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}
Minified JSON
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{"filters":{"region":"eu","active":true},"limit":25}

Minification removes presentation whitespace only. Keep a formatted copy when another person needs to review the payload.

How to Format JSON Online

  1. 1Paste or import the JSON you want to read.
  2. 2Choose indentation, key sorting, or minified output for the next task.
  3. 3Review the result, then copy or download the formatted JSON.

When you need a field-level review, use JSON Compare to compare formatted JSON with another payload and focus on the paths that actually changed.

Related JSON Tools

Frequently Asked Questions

What is a JSON formatter?

A JSON formatter, also called a JSON beautifier or pretty printer, adds consistent indentation and line breaks so a valid JSON document is easier to read and review.

How do I format JSON online?

Paste or import valid JSON, then choose 2 spaces, 4 spaces, key sorting, or minified output. You can copy, download, or apply the result back to the input.

Does formatting change JSON data?

No. Formatting changes whitespace and, if you choose it, object-key display order. The JSON values and structure remain the same.

What does pretty print JSON mean?

Pretty printing expands compact JSON into readable lines and nested indentation. It is useful for reviewing API responses, logs, configurations, and fixtures.

Can I format nested JSON?

Yes. Nested objects and arrays are indented recursively, and you can sort object keys when a stable display order helps review or comparison.

Is JSON formatting processed locally?

Yes. Formatting, minifying, escaping, unescaping, copying, and downloading run in your browser.