JSON Formatter

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Format, minify, repair and query JSON for free in your browser. KitVerse keeps API responses, logs and config snippets local, with no upload and no saved content.

Browser-local · No upload · No saved content

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JSON Formatter overview

The JSON Formatter cleans compact, messy or partially invalid JSON, with format, minify, repair and JSONPath query actions for API debugging, config checks and log review. Content stays in your browser.

How to use JSON Formatter

1Paste JSON into the Input JSON editor. The page shows whether it is valid and counts nodes, objects and arrays.
2Use Format for readable indentation, Minify for a compact string, or Repair when the pasted text has common JSON syntax issues.
3Enter a JSONPath such as $.features[*], $.user.name or $['items'][0], then click Query to extract matching values.
4Copy the output to the clipboard, or download it as kitverse.json when you need a local file.

Troubleshooting

Trailing commas break parsing

Copied objects or arrays often include a comma after the final item.

Run Repair first, then review the formatted output.

JSONPath returns no matches

Field casing, array depth or a missing $ prefix can result in an empty response.

Start with a simple path such as $.items and add fields gradually.

Very large JSON feels slow

Local browser processing depends on device memory.

Process the relevant section or split huge exports into smaller chunks.

JSON format, minify, repair and query comparison

Each action runs locally, but they solve different workflow problems.

Action	Best for	Output	Notes
Format	Reading API responses and config	Indented JSON	Requires parseable or repairable JSON
Minify	Embedding JSON in requests or env values	Compact JSON	Harder to read after compression
Repair	Fixing common paste issues	Valid formatted JSON when possible	Review important fields after repair
JSONPath query	Extracting fields from large objects	Matched values array	Supports common dot, bracket and wildcard paths

JSON Formatter examples

API response formatting

Before

{"user":{"id":42,"name":"KitVerse"},"roles":["admin","editor"],}

After format/repair

{
  "user": {
    "id": 42,
    "name": "KitVerse"
  },
  "roles": [
    "admin",
    "editor"
  ]
}

Useful for expanding compact responses and fixing common paste issues such as trailing commas.

JSONPath query

Query

$.roles[*]

Matches

[
  "admin",
  "editor"
]

Common fields, array indexes and wildcards are supported.

Use cases

API debugging

Pretty-print API responses and inspect missing fields or type mismatches.

Config checks

Validate JSON configuration before publishing and minify it for embedding.

Log investigation

Repair and expand JSON snippets from logs, then extract fields with JSONPath.

FAQ

Is my JSON uploaded to a server?›

No. Formatting, minifying, repair and JSONPath queries run locally in your browser.

Is the JSON formatter free?›

Yes. The core JSON tools are free and do not require sign-in.

What JSONPath syntax is supported?›

The tool supports common $ paths, dot fields, bracket fields or array indexes, and * wildcards. Filters and script expressions are not supported.

Can JSON repair change my data?›

Repair fixes common syntax problems so the payload can be parsed. It does not understand your business data, so review important fields after repair.

Can it handle large JSON files?›

It depends on your browser memory and device performance. Very large logs are better processed in smaller chunks.

Why is my JSON marked invalid?›

Common causes include single quotes, trailing commas, missing brackets, unescaped line breaks or extra non-JSON text.

Where does the download go?›

The browser saves a local kitverse.json file according to your download settings.

Can I paste sensitive API payloads?›

The tool processes them locally and does not upload them, but you should still avoid leaving secrets in the page or clipboard longer than needed.