Developer Tool

JSON TOOL

Format, validate, minify, query, and convert JSON — 100% private, no server uploads.

Private by design No signup · Free

Options

Indent:

Sort keys

Input Ctrl+Shift+F / V / M

Extras

Enter a JSONPath expression. Supports dot notation, array indexes, wildcards (*), and deep scan (..).

Click "Schema" to generate.

Output

Lines: 0 Chars: 0 Time: 0ms

History

No recent actions. Format, validate, or minify JSON above.

Frequently Asked Questions

How do I find the exact position of a JSON error?

Paste the JSON and read the highlighted error badge with line and column numbers. The cursor jumps to the first failure so you can fix brackets, commas or quotes immediately.

Can I convert JSON to CSV or YAML here?

Yes. One click maps JSON arrays to CSV rows or YAML documents without data loss. Nested objects flatten with dot paths you can copy straight into spreadsheets.

Does it handle JSONC comments and trailing commas?

Yes. Tolerant mode accepts double-slash comments and trailing commas found in configs, then offers one-click cleanup to strict JSON for production use.

Is there a size limit for JSON files?

No hard limit. Parsing runs locally in your browser, so multi-megabyte payloads validate in seconds. Very large files simply take longer to render in the tree view.

How does the JSON Formatter work?

Simply paste your JSON into the input field. The tool instantly formats and validates it directly in your browser.

Is my JSON data safe?

Yes. All processing happens locally in your browser. Your data never touches any server and is never stored.

How to Use

Paste JSON

Paste your JSON data into the input text area.

Select Mode

Choose between Format, Validate, or Minify modes.

View Result

Instantly see the formatted JSON, explore the tree view, or copy the output.

How to Calculate

Validation parses with JSON.parse semantics and reports the exact line and column of the first error. Formatting re-prints with 2-space indent, minify strips whitespace, and converters map JSON to YAML, CSV, or query paths losslessly.

About the JSON Formatter & Validator

The JSON Formatter & Validator formats, validates, minifies and converts JSON with tree view, JSONPath queries, CSV/YAML conversion and schema generation. It reports exact line and column errors, fixes trailing commas and JSONC quirks, and handles minify vs pretty-print for 2026 API workflows.

JSON you paste is parsed and formatted entirely in memory — nothing is logged. Validate schemas, minify for transport, and pretty-print for debugging.

Related Tools

Methodology & feedback

Figures run locally in your browser from the values you enter (page updated 2026-10-02). Estimates are educational only — verify finance, tax and health decisions with a qualified professional (see Disclaimer). Spotted an error? Report it via contact and we correct with a new update date.

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