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Free tool for developers

JSON Formatter & Validator - Format and Validate JSON

Format, minify and validate JSON online. Configurable indentation (2/4 spaces or tab), error display with exact positions and one-click copy. Everything runs locally in your browser.

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How to format, minify and validate JSON?

The JSON Formatter tool does all three jobs in 3 steps: 1) Paste your JSON text into the input field (or click Load Sample to see how the tool works). 2) Choose an indentation style: 2 spaces (compact), 4 spaces (more readable), or tab (standard for some build tools). 3) Click Format for pretty-print, Minify for API/production, or Validate just to check correctness. The tool shows the error with the exact line and position — most often a trailing comma, single quotes, comments, or missing double quotes. Everything is processed locally using JSON.parse and JSON.stringify — nothing is sent to the server. BeoHosting Node.js hosting from $4.66/month supports Express, Fastify, and NestJS frameworks for working with JSON APIs.

  • Three functions — Format, Minify, Validate
  • Configurable indentation — 2 spaces, 4 spaces or tab
  • Local in browser — JSON.parse/stringify, no server calls
  • BeoHosting Node.js hosting from $4.66/month for JSON APIs

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JSON Formatter & Validator

Enter or paste JSON text, then format, minify or validate.

Privacy: JSON is parsed and formatted exclusively in your browser using built-in JavaScript functions (JSON.parse/JSON.stringify). Nothing is sent to the server or stored. Your data is completely safe.

Developer guide

JSON Format - Everything you need to know

JSON (JavaScript Object Notation) is today the most widely used format for data exchange on the web. It is used by almost all modern APIs, configuration files (package.json, tsconfig.json), and databases (MongoDB, CouchDB). JSON has replaced XML as the preferred format due to its simplicity, readability, and smaller size.

Basic JSON format rules

JSON supports six data types: strings (in double quotes), numbers, objects (key-value pairs in curly braces), arrays (in square brackets), boolean (true/false), and null. Keys in objects must be strings in double quotes. Unlike JavaScript, JSON does not support comments, trailing commas, or single quotes.

JSON in web development

In modern web development, JSON is the standard for communication between frontend and backend via REST and GraphQL APIs. On BeoHosting hosting plans you can host web applications that use JSON for data exchange. All our servers support a modern stack for developing API-driven applications.

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Frequently asked questions - JSON Formatter

Answers to the most common questions about our services.

JSON (JavaScript Object Notation) is a lightweight data interchange format. It is readable for both humans and machines. It is based on a subset of the JavaScript programming language and is used in almost all modern web applications, APIs, and configuration files. It supports the data types: strings, numbers, objects, arrays, boolean, and null values.

Formatting (beautify/pretty-print) adds spaces, indentation, and new lines to make JSON readable for humans. Minification removes all unnecessary whitespace and new lines, reducing file size. Use formatted JSON during development and debugging, and minified JSON for production and API communication where data size matters.

The most common JSON errors are: trailing comma after the last element, single instead of double quotes for strings, comments (JSON does not support comments), unescaped special characters in strings, and missing quotes around object keys. Our tool shows the exact line and position of the error.

Absolutely safe. All JSON is parsed, formatted, and validated exclusively in your browser using the built-in JSON.parse() and JSON.stringify() functions. Nothing is sent to the server or stored. Your data never leaves your browser.

Our tool can handle JSON files up to several megabytes without issues. For extremely large files (100MB+), the browser may slow down because all processing happens locally. In that case, we recommend desktop tools such as VS Code or the jq command-line tool. For standard API responses and configuration files, our tool is more than enough.

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