JSON Formatter & Validator

Format, validate, and beautify JSON data instantly. Runs entirely in your browser.

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Input

Output

✓ Validates JSON

Detects syntax errors and shows the exact line and position of the problem.

✓ 100% Private

Your data never leaves your browser. No server-side processing at all.

✓ Instant

Format and validate JSON of any size instantly with no upload required.

privacy

Format JSON, decode JWT, count words, generate hashes, and convert text without uploading your input.

workflow

A compact toolbox for recurring developer, writing, SEO, and AI-content checks.

rootnest

Use it with OnePost, 周报侠, 内容搭子Pro, and other small focused tools.