Online JSON formatter with 6 tools: beautify/format, minify/compact, validate, escape special characters, unescape, and convert JSON to 20+ programming languages. All processing happens locally in your browser – zero data upload. For developers, API testing, and data debugging.
How to Use
Paste your JSON, or open a file
You can type or paste into the input box, or open a local .json file from your machine — the file is read in the browser and never uploaded.
Choose one of the six operations
Format, minify, validate, escape, unescape, or convert the data into a class or type definition for one of 21 target languages.
Copy, print or save the result
The first four operations save as a .json file; the conversion saves with the target language's own extension, such as .java or .ts.
JSON Format/Beautify
Format and beautify messy JSON with customizable indentation. Supports tabs and 2/3/4 space indentation. One-click copy, print, or save your formatted JSON output.
Tab Indentation
2 Spaces Indentation
3 Spaces Indentation
4 Spaces Indentation
One-click Copy Formatted Content
Print Formatted Content
Save Formatted Content as JSON File
JSON Minifier / Compactor
Remove all whitespace and line breaks from your JSON to create a compact, network-friendly string. Perfect for API payloads, URL parameters, and storage optimization.
One-click Copy Content without Whitespace (Tab Indentation)
Print Content without Whitespace (Tab Indentation)
Save Content without Whitespace (Tab Indentation) as JSON File
JSON Validator (Validate JSON Content)
Quickly validate your JSON syntax and pinpoint error locations. Get instant feedback with error line numbers and visual markers for quick debugging.
Escape JSON - Protect Special Characters
Automatically escape special characters in JSON strings including double quotes, backslashes, newlines, tabs, and carriage returns. Essential for embedding JSON in source code, SQL queries, and configuration files.
Embed JSON in JavaScript/Python source code
Store JSON in database fields without syntax errors
Prepare JSON strings for API request bodies and configuration files
Unescape JSON - Restore Readable Format
Reverse the escaping process: convert escaped JSON strings back to human-readable format. Restore
to newlines, " to quotes, and \ to backslashes for clean data inspection.
Read log files and debug output containing escaped JSON
Parse escaped JSON responses from APIs and webhooks
Clean up configuration data imported from external sources
Data to Class (Transforming JSON data to Class Object)
Supported JSON Conversion Types:
Json to XML
Json to XSD (XML Schema)
Json to DTD (Document Type Definition)
Json to Java
Json to Python
Json to Objective-C
Json to Swift
Json to C#
Json to Go
Json to Rust
Json to Crystal
Json to C++
Json to TypeScript
Json to JavaScript Proptypes
Json to Flow
Json to Kotlin
Json to Elm
Json to Ruby
Json to Dart
Json to Pike
Json to Haskell
One-click Copy Converted Class Content
Print Converted Class Content
Save Converted Object as Corresponding Class File
6. Other Features
Supports 20+ programming language conversions including Java, Python, C#, TypeScript, Go, Rust, and more. All features run client-side in your browser. Free to use with unlimited conversions.
Frequently Asked Questions
- Why does my JSON fail to parse when it looks fine?
- Parsing here is strict JSON, the same rules a browser or API applies. Comments, trailing commas, single-quoted strings, unquoted keys, and the values NaN or Infinity are all rejected, so JSON5 and JSONC documents do not work as they are. The validate operation tells you which line the parser stopped on.
- Can I rely on escape followed by unescape to give me my text back?
- Not if your text contains a literal backslash-n or backslash-t, such as a Windows path like C:\temp or an already-escaped JSON string. Unescaping replaces backslash-n with a real newline before it collapses doubled backslashes, so those two characters are not restored. For ordinary text with no literal backslash sequences the round trip is exact, but do not treat this pair as a reversible codec for arbitrary content.
- What does the conversion to a class or object actually produce?
- It derives type definitions from the shape of the JSON you provide, for 21 targets including Java, TypeScript, Go, Rust, Swift, Kotlin, Python and Haskell. It is shape inference from your sample, not a schema compiler: field types come from the values in that one example, and nothing is validated against a JSON Schema or an XSD you already have.
- Is my JSON sent to a server?
- No. Parsing, formatting, escaping and the class conversion all run in your browser, including for files you open. Nothing is transmitted and nothing is stored.