developer

JSON Formatter

Format, validate, and minify JSON data with syntax checking and statistics

json

formatter

validator

developer

JSON Formatter and Validator Tool

Professional JSON formatter, validator, and minifier for developers. Format JSON data with proper indentation, validate syntax errors, and minify for production use. Essential for API debugging, configuration file management, and data validation workflows.

JSON Input

About JSON Formatter

Comprehensive JSON formatting and validation tool designed for developers and data engineers. This utility helps debug API responses, clean up configuration files, validate data structures, and optimize JSON for production environments. Supports syntax checking, pretty printing, statistics generation, and error reporting with detailed line numbers and descriptions.

The JSON formatter uses the native JavaScript JSON.parse() method for robust validation and parsing. When you paste or input JSON data, the tool analyzes the structure, checks for syntax compliance with RFC 8259 standards, and generates formatted output with configurable indentation. The validator identifies common errors like missing commas, trailing commas, unquoted property names, and mismatched brackets. Statistics including key count, nesting depth, and file size are calculated in real-time to help optimize data structures.

• API Debugging: Format and validate API responses for easier inspection
• Config Files: Clean up configuration files (package.json, tsconfig.json)
• Data Validation: Ensure JSON data structures are correct before processing
• Code Review: Minify JSON for production or format for readability in development

How to validate JSON?

Click the Format button - if there are syntax errors, they'll be displayed with line numbers and error descriptions. The tool uses the native JSON.parse() method for validation.

Best JSON formatter for VS Code?

VS Code has built-in JSON formatting (Shift+Alt+F). For online formatting, this tool provides validation, statistics, and works without installation.

Difference between format and minify?

Format adds indentation and line breaks for readability (best for development). Minify removes all whitespace for smaller file size (best for production/API transmission).

Can I format invalid JSON?

No, invalid JSON cannot be formatted. Fix syntax errors first - common issues include missing commas, trailing commas, unquoted keys, or single quotes instead of double quotes.

• Check for common syntax errors: missing commas, trailing commas, unquoted property names, or using single quotes instead of double quotes
• For large JSON files, consider using streaming parsers to avoid memory issues
• Use JSON Schema validation for complex data structures to ensure data integrity
• Use 2-space indentation for most cases, 4 spaces for deeper nesting visibility

JavaScript Parse: JSON.parse(jsonString)

JavaScript Stringify: JSON.stringify(obj, null, 2)

Error Handling: try { JSON.parse(str) } catch (e) { console.error('Invalid JSON') }

• Standard: RFC 8259 (JSON Data Interchange Format)
• Supported Types: Object, Array, String, Number, Boolean, null
• Encoding: UTF-8
• Max Depth: No theoretical limit (practical limit depends on memory)