✅

JSON Validator

100% Client-Side

Validate JSON strings with detailed line and column error indicators, key counters, data type inspection, and payload sizing.

JSON Payload to Validate

How to Use JSON Validator

Paste JSON Text

Enter JSON payload or response from an API into the editor.

Validate Hierarchy

Click Validate JSON to run complete structural syntax parsing.

Inspect Schema

Examine root type, total key counts, payload byte size, or fix errors.

✓ Pinpoint Location

Provides precise line numbers and character positions for malformed tokens.

✓ Type Inspection

Reports whether root node is an Object, Array, Primitive, or Null.

✓ Payload Sizing

Calculates exact byte footprint for network optimization.

🔒 Complete Client-Side Isolation

This tool runs entirely in your local browser runtime. No logs, analytics tracking, or remote server transmissions occur.

Format, pretty-print, validate, and minify JSON strings with instant syntax error detection, line indicators, and custom indentation.

Encode and decode Base64 strings with full Unicode (UTF-8) character and emoji support, plus optional URL-safe Base64 formatting.

Safely encode text and query parameters into standard percent-encoded URI strings or decode encoded URLs into human-readable text.