PRIVATE-FIRST · BROWSER-BASED

JSON Formatter & Validator

Beautiful JSON editing, precise validation, tree exploration, minification and formatting. Fast, private and easy to use.

Sample JSON Indent

Input JSON

1 lines

Ready for JSON input

JSON stays in your browser.

Output

Format, validate or inspect nested values.

Tree view shows up to 5,000 children per node to protect responsiveness. Large or deeply nested files may need dedicated streaming tools.

JSON Formatter & Validator: practical guidance

Beautify, validate, minify and edit JSON with line-level diagnostics. For sensitive production records, review the data before copying, downloading or submitting it anywhere. Local processing does not make every secret safe to paste into a third-party browser environment.

Useful workflow

Start with one of the included examples, verify the result, then use the related JSON tools when you need to inspect fields, validate an API contract, or generate test data. The tools use the same JSON representation but perform different tasks.

JSON Tree Viewer JSON Compare JSON Data Generator Sensitive Data Redactor

Everything you need to work with JSON

Go beyond formatting: inspect API responses, generate safe test datasets, and analyze schema changes.

JSON Tree Viewer

Inspect nested JSON, expand branches and copy JSONPath.

Open tool Analyze

JSON Compare

Find meaningful differences independent of object key order.

Open tool Generate

JSON Data Generator

Generate products, orders, inventory, customers or records from your own JSON template.

Open tool Security

Sensitive Data Redactor

Detect and mask common sensitive fields locally.

Open tool Analyze

JSON Schema Validator

Validate against JSON Schema with precise field paths.

Open tool API & QA

REST API Tester

Send CORS-compatible HTTP requests from your browser.

Open tool API & QA

JSON Edge-Case Generator

Generate missing-field, null, boundary and invalid-type test cases.

Explore Other Popular Formatters

Working with HTML, XML, YAML, SQL or JavaScript? Visit the dedicated Clearfunda Formatter application for more free developer tools.

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HTML Formatter

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YAML Formatter

Format and validate YAML configuration.

SQL Formatter

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JavaScript Formatter

Beautify modern JavaScript source.

All Formatters

Explore the full Clearfunda formatting collection.

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