JSONToonPro
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JSON formatter tool

JSON Formatter and Beautifier Online

Free online JSON Formatter and JSON Beautifier. Format JSON, validate syntax, minify payloads, sort object keys, lint JSON errors, inspect an API response formatter view, and analyze JSON structure in one browser-based developer tool. All processing is client-side and your data stays private.

Client-side processingFormatter, validator, minifierCopy and download
Input JSON
Output
Paste JSON to format, beautify, validate, minify, analyze, or view it as a tree.
0 input chars0 output charsWaiting for valid JSON

How to format and beautify JSON

Three steps, zero setup
01

Paste or upload JSON

Add raw JSON, minified JSON, API responses, config files, logs, or local fixtures into the input panel.

02

Choose the JSON action

Beautify, minify, validate, sort keys, repair comments and trailing commas, view the JSON tree, or analyze structure.

03

Copy or download output

Copy formatted JSON, download a .json file, inspect stats, or use filtered output search to find keys and values quickly.

Built for API debugging and clean JSON editing

A strong JSON formatter page should do more than add indentation. This tool combines JSON beautifier, JSON validator, JSON minifier, JSON pretty printer, JSON tree viewer, and JSON analyzer features in one workflow.

JSON Formatter

Pretty print JSON with 2-space, 4-space, or tab indentation.

JSON Beautifier

Turn compressed or hard-to-read JSON into clean readable structure.

JSON Validator

Check JSON syntax and show clear parse errors for invalid input.

JSON Minifier

Compress JSON by removing whitespace and line breaks.

Tree viewer

Navigate nested JSON objects and arrays in a collapsible tree.

Output search

Filter formatted JSON lines to find keys, values, and paths faster.

JSON analyzer

View size, depth, keys, nodes, arrays, objects, and primitive counts.

Common issue repair

Strip comments and trailing commas from JSON-like input when enabled.

Export workflow

Upload .json files, copy output, or download formatted and minified JSON.

Frequently asked questions

10 answers
Paste JSON into the input editor, choose 2 spaces, 4 spaces, or tab indentation, then use Beautify. The formatted JSON output appears instantly with consistent indentation and line breaks. The JSON Formatter and JSON Beautifier are free to use with no sign-up required.

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