JSON Formatter

A JSON formatter parses valid JSON and rewrites it with consistent indentation, line breaks, and punctuation so objects and arrays are easier to read. It can also validate the input and produce compact JSON when whitespace should be removed.

Paste or load a JSON file, choose Beautify JSON, select an indentation style, and run the formatter. ToolsSonic uses JSON.parse and JSON.stringify in your browser to produce readable output without uploading the document.

Yes. Formatting requires valid JSON, so parsing acts as a syntax check. If a bracket, quote, colon, comma, or value is invalid, the page shows an error with an approximate line and column when the browser exposes a character position.

Yes. Choose Minify JSON or select Compact JSON output. The result removes non-semantic whitespace while preserving JSON values, strings, arrays, objects, numbers, booleans, and null.

Yes. The formatter supports two spaces, four spaces, tabs, and compact output. Two spaces are common for web APIs, four spaces can improve deep configuration files, and tabs can match a project's editor settings.

Yes. Choose Sort keys A–Z or Z–A when deterministic key order helps with reviews, snapshots, or documentation. Keep original order when the source order is meaningful to your workflow.

Formatting changes whitespace and, only when selected, object key order. It does not change scalar values. Sorting keys changes presentation order, so compare the output with the original before committing it to a workflow that depends on ordering.

Yes. Keep Unicode characters for readable output or choose Escape non-ASCII characters when an ASCII-only representation is required. JSON strings remain valid after either choice.

Yes. Select a local JSON file and the browser reads it with FileReader. The file is not sent to a conversion server and no persistent JSON history is written.

No. Validation answers whether the document follows JSON syntax. Formatting rewrites valid JSON for readability, while minification removes whitespace. The formatter performs the syntax check as part of the formatting operation.

JSON is a text interchange format with stricter syntax: property names and strings use double quotes, comments are not allowed, and values are limited to objects, arrays, strings, numbers, booleans, and null. A JavaScript object literal may use features that JSON.parse rejects.

The formatter runs locally in your browser using built-in JSON APIs. It does not upload input, call a remote formatting service, or store JSON in localStorage. Clipboard contents and shared-device access remain separate privacy considerations.

Beautify adds indentation and line breaks for readability. Minify removes all optional whitespace to make the payload as small as possible. Validate checks the syntax and reports the exact line of the first error without changing your text.

You can format with 2 spaces, 4 spaces, or tabs. Two spaces is the most common convention for web APIs and config files; tabs suit teams that standardise on tab indentation.

Yes. Enable the sort keys option and every object in the output is emitted with its keys in alphabetical order, which makes large documents easier to scan and diff.

Switch to validate mode or simply paste the text — the tool reports the first syntax problem with its line so you can jump straight to it. Common causes are trailing commas, single quotes, and unquoted keys.

Yes. Load a file from your device and it is read locally with the browser FileReader API, formatted, and offered back for copy or download. The file is never uploaded.

The tool handles typical API responses and config files instantly. Very large documents are limited only by your browser memory, not by a server quota, because processing is fully local.

No. Formatting only changes whitespace and, if you enable it, key order. Strings, numbers, booleans, and nulls are emitted exactly as parsed.

Everything runs locally in your browser with no upload, no account, and no logging. You can confirm in your browser DevTools Network tab that no request carries your data.