JSON-форматировщик
Форматируйте, валидируйте и красиво печатайте JSON.
Format & Beautify JSON
Formatting JSON makes it readable and helps debug structure errors. Often APIs return minified JSON which is hard to read; this tool solves that instantly.
Privacy First
Your JSON data never leaves your browser. All formatting and validation is done locally using JavaScript, ensuring your data remains private and secure.
Reading Messy JSON: Why Formatting Matters
Обзор
JSON has become the universal data format of the web — APIs, config files, NoSQL databases, logs, and almost every modern application speak it. But minified JSON (no whitespace, single line) is unreadable by humans. Pretty-printing JSON adds indentation and line breaks to reveal nesting structure, making bugs and missing fields immediately visible. This tool not only formats, but also validates (catches missing brackets, trailing commas, unquoted keys), minifies for production, and converts between JSON and related formats.
Как пользоваться (по шагам)
- 1
Paste your JSON
Cmd/Ctrl+V from any source. Trailing whitespace, BOM characters, and JSON-with-comments (JSONC) inputs all get cleaned up.
- 2
Format, minify, or sort keys
Format gives a readable indented version. Minify produces the smallest valid output. Key sorting helps make two JSONs diffable.
- 3
Copy the result
The output is ready for code, configs, or pasting into Slack/issues. If your input was invalid, the error message points to the exact line and column.
Как это работает
JSON.parse() parses input; JSON.stringify(parsed, null, 2) reformats with 2-space indentation. Errors from JSON.parse provide a position so the tool can highlight where the syntax broke. The validator catches the common JSON5 mistakes — trailing commas after the last array/object element, single quotes instead of double, unquoted object keys, and JS-style comments (which are not part of strict JSON). Minify removes all unnecessary whitespace, useful when shipping JSON in URLs or compact storage.
Когда пригодится
Debugging API responses copied from a terminal. Cleaning up config files written by hand. Reviewing third-party API documentation samples. Validating JSON Schema example data. Inspecting Webpack/Vite build manifests. Comparing two JSON files (after formatting both, a diff is meaningful). Preparing JSON for inclusion in code (escaped quotes, etc.).
Частые вопросы
JSON (RFC 8259) is strict: double-quoted keys/strings, no trailing commas, no comments. JSON5 extends this with JavaScript-like syntax (single quotes, unquoted keys, comments, trailing commas). This tool warns when input is JSON5-style invalid JSON.
Рекомендуемые инструменты
Подборка полезных утилит
Reading Messy JSON: Why Formatting Matters
Обзор
JSON has become the universal data format of the web — APIs, config files, NoSQL databases, logs, and almost every modern application speak it. But minified JSON (no whitespace, single line) is unreadable by humans. Pretty-printing JSON adds indentation and line breaks to reveal nesting structure, making bugs and missing fields immediately visible. This tool not only formats, but also validates (catches missing brackets, trailing commas, unquoted keys), minifies for production, and converts between JSON and related formats.
Как пользоваться (по шагам)
- 1
Paste your JSON
Cmd/Ctrl+V from any source. Trailing whitespace, BOM characters, and JSON-with-comments (JSONC) inputs all get cleaned up.
- 2
Format, minify, or sort keys
Format gives a readable indented version. Minify produces the smallest valid output. Key sorting helps make two JSONs diffable.
- 3
Copy the result
The output is ready for code, configs, or pasting into Slack/issues. If your input was invalid, the error message points to the exact line and column.
Как это работает
JSON.parse() parses input; JSON.stringify(parsed, null, 2) reformats with 2-space indentation. Errors from JSON.parse provide a position so the tool can highlight where the syntax broke. The validator catches the common JSON5 mistakes — trailing commas after the last array/object element, single quotes instead of double, unquoted object keys, and JS-style comments (which are not part of strict JSON). Minify removes all unnecessary whitespace, useful when shipping JSON in URLs or compact storage.
Когда пригодится
Debugging API responses copied from a terminal. Cleaning up config files written by hand. Reviewing third-party API documentation samples. Validating JSON Schema example data. Inspecting Webpack/Vite build manifests. Comparing two JSON files (after formatting both, a diff is meaningful). Preparing JSON for inclusion in code (escaped quotes, etc.).
Частые вопросы
JSON (RFC 8259) is strict: double-quoted keys/strings, no trailing commas, no comments. JSON5 extends this with JavaScript-like syntax (single quotes, unquoted keys, comments, trailing commas). This tool warns when input is JSON5-style invalid JSON.