FormattersJSON Formatter

JSON Formatter

Instantly format, beautify, validate, and minify JSON data with syntax highlighting and error detection. Supports pretty-printing with configurable indentation and one-click minification for production use.

JSON Formatter guide

Use Toolfy's JSON Formatter to turn minified or messy JSON into readable, indented data while checking for syntax errors. Everything runs locally in your browser, so pasted API responses, logs, and configuration files do not need to leave your device.

Key features

Beautify JSON with readable indentation and syntax highlighting
Validate JSON syntax and surface parse errors quickly
Minify formatted JSON for compact payloads and production snippets
Work with API responses, config files, logs, and copied JSON fragments

Common use cases

Debug malformed API responses before sharing them with a backend team
Reformat compact JSON from logs, browser devtools, or HTTP clients
Minify JSON before embedding it in test fixtures or request bodies

Frequently asked questions

Is this JSON formatter safe for private data?

Yes. The formatter runs in your browser and does not require uploading JSON to a server.

Can it validate JSON as well as format it?

Yes. Invalid JSON shows a parse error so you can fix syntax issues before using the data.

What is the difference between beautify and minify?

Beautify adds whitespace and indentation for readability. Minify removes unnecessary whitespace to make JSON smaller.

JSON Validator

Validate JSON syntax instantly with detailed error messages showing exactly where parsing fails. For valid JSON, displays structural statistics including object count, array count, key count, nesting depth, and value type breakdown.

JSON ↔ YAML

Bidirectional JSON to YAML and YAML to JSON converter. Instantly transform JSON objects into clean YAML configuration files, or parse YAML back to structured JSON. Handles nested objects, arrays, and all scalar types.

JSON ↔ CSV

Convert JSON arrays to CSV spreadsheets and CSV data back to JSON. Supports comma, tab, semicolon, and pipe delimiters. Download results directly as .csv or .json files for use in Excel, Google Sheets, or databases.

JSON Insight

Analyze and explore JSON data structure visually. Automatically parses any JSON input, renders a collapsible structure tree with type annotations, generates precise JSONPath expressions on click, and computes field-level statistics (count, min, max, avg) for array fields. Ideal for quickly understanding complex or unfamiliar API responses.