Paste your JSON to format, minify, or validate. Get pretty-printed output with 2-space indent, compact minified JSON, or check syntax with clear error messages and line numbers.
Use our Schema Markup Generator to create valid JSON-LD for SEO. Need custom APIs or data integrations? Our web development team builds robust backends with proper JSON handling and validation.
Explore All ToolsJSON (JavaScript Object Notation) is a lightweight data format used everywhere from APIs and config files to structured data for SEO. Valid JSON must use double quotes for strings, proper escaping for special characters, and correctly balanced braces and brackets. A JSON formatter helps you clean up messy or minified JSON so it's readable, while a validator catches syntax errors before they cause problems in your application.
Formatting (pretty printing) adds indentation and line breaks to make JSON human-readable. Use it when inspecting API responses, debugging config files, or editing JSON by hand. Minifying removes unnecessary whitespace to reduce file size—ideal for production APIs, CDN delivery, or embedding JSON in HTML.
Trailing commas after the last array element or object property are invalid in JSON. Single quotes are not allowed—use double quotes for strings. Unescaped newlines, tabs, or backslashes inside strings will cause parse errors. Keys must always be in double quotes. JavaScript undefined, NaN, and Infinity are not valid JSON values. Our validator reports the error message and approximate line number so you can fix issues quickly.
Working with complex JSON schemas, REST APIs, or data pipelines? Our web development team builds robust backends with proper validation, error handling, and type safety. Get in touch for a consultation.
package.json, tsconfig.json) before deploymentThe most common causes are trailing commas, single quotes instead of double quotes, unquoted keys, and JavaScript-specific values like undefined or NaN. The validator reports the error and line number so you can fix issues quickly. Need to convert from YAML or CSV? Try our YAML to JSON or CSV to JSON converters.
Formatting adds indentation and line breaks to make JSON human-readable — ideal for development and debugging. Minifying removes all unnecessary whitespace to reduce file size, which is better for production APIs and CDN delivery.
All processing happens entirely in your browser. No data is sent to any server, stored, or logged. For enterprise-grade JSON handling, API validation, and data pipelines, our web development team builds robust solutions with type safety and error handling.