JSON Formatter & Validator

Make Your JSON Human-Readable in One Click

Minified JSON is efficient for transfer but miserable to read. A single missing comma, an extra bracket, or a wrong data type buried three levels deep can take ten minutes to find in an unformatted blob — and ten seconds to spot once it’s properly indented.

CodeReplica’s JSON Formatter takes raw, minified, or malformed-looking JSON and instantly reformats it with consistent indentation and syntax highlighting. The built-in validator identifies structural errors and points you to the line and character position where the problem lives.

Features

• Instant formatting — paste JSON and see the beautified output immediately
• Syntax validation — get clear error messages for malformed JSON
• Error location — know exactly which line and character caused the parse failure
• Syntax highlighting — keys, values, strings, numbers, and booleans visually distinguished
• One-click copy — copy formatted output directly to clipboard
• Works entirely in-browser — your JSON never leaves your machine

Common Developer Use Cases

• Debugging API responses — paste raw response bodies and read them clearly
• Reviewing config files — check appsettings.json, package.json, or any config before committing
• Data pipeline troubleshooting — validate JSON payloads at each transformation step
• Onboarding new team members — share formatted JSON in documentation instead of raw blobs

JSON Validation Rules Our Tool Checks

• Proper bracket and brace matching
• No trailing commas (not valid in standard JSON)
• All keys must be double-quoted strings
• Values must be valid JSON types: string, number, boolean, null, array, or object
• Correct nesting depth and structure