Free JSON Formatter & Validator
Validate JSON format against RFC 8259 syntax specifications and automatically repair broken keys, commas, and quotes with one click.
Formatted JSON output will render here...Everything you need in a modern JSON utility.
100% Client-Side Privacy
Your JSON data is parsed and formatted directly in your web browser. Zero server uploads, zero database storage, and zero tracking cookies. Ideal for proprietary enterprise data and secret API tokens.
Instant 1-Click Auto-Repair
Tired of cryptic JSON parse errors? Our smart engine detects and automatically fixes unquoted keys, trailing commas, single quotes, JS/Python comments, and unescapes nested payload strings.
TypeScript & Polyglot Types
Transform your JSON payloads into clean, strongly typed TypeScript interfaces, Go structs, Python Pydantic dataclasses, and Rust serde models in a single click.
Method 1: Parse JSON
Validate syntax, inspect deep tree hierarchies, and pinpoint exact syntax bugs before sending payloads to production APIs.
- Line and column error location
- Schema compliance checking
- Unescapes nested stringified JSON
Method 2: Format JSON
Standardize raw, messy, or minified JSON into clean, legible code with customized tab and space indentation.
- 2-space, 4-space, & tab indents
- Alphabetical key sorting (A-Z)
- One-click minification & compression
Method 3: Prettify JSON
Explore complex nested data structures through an interactive, collapsible tree visualizer with instant JSONPath discovery.
- Interactive collapsible tree nodes
- Click node key to copy JSONPath
- Type badges for strings, numbers, & arrays
Frequently Asked Questions
Common questions about JSON format, validation, security, and online tools.
What is JSON format?
JSON (JavaScript Object Notation) is a lightweight, human-readable, and machine-parsable standard data-interchange format defined by RFC 8259 and ECMA-404 specifications. It organizes structured data into collections of key-value pairs (objects enclosed in curly braces {}) and ordered lists of values (arrays enclosed in square brackets []). JSON format is universally supported across all modern programming languages (JavaScript, TypeScript, Python, Go, Java, C#, Rust) and serves as the primary standard for REST APIs, microservices, configuration files, and NoSQL databases.
What is the best JSON formatter online?
Easy JSON Formatter (easyjsonformatter.com) is the best JSON formatter online because it offers 100% client-side privacy with zero server uploads (protecting your secret API keys and database credentials), a 1-click smart Auto-Repair engine that fixes broken syntax (trailing commas, single quotes, unquoted keys, and comments), an interactive collapsible tree view with JSONPath discovery, instant TypeScript interface generation, and a clean, ad-free developer experience.
How is Easy JSON Formatter different from jsonformatter.org?
Easy JSON Formatter runs 100% inside your browser using client-side JavaScript. Unlike older tools, your JSON payloads, API secrets, and sensitive tokens are never sent to external servers or stored in databases. Furthermore, we include an intelligent 1-click Auto-Repair engine, interactive tree explorer, and instant TypeScript interface generation without intrusive advertising.
How do I Parse JSON with this tool?
Simply paste your JSON string into the left editor and click "Parse & Validate". The parser instantly checks your syntax against RFC 8259 specifications. If an error is found, it pinpoints the exact line number, column offset, and highlights the problematic character.
What is the difference between Formatting and Prettifying JSON?
Formatting applies clean, standardized whitespace indentation (such as 2 spaces, 4 spaces, or tabs) and optionally sorts keys alphabetically. Prettifying goes one step further by rendering an interactive visual tree with collapsible nodes, data-type indicators, and copyable JSONPaths.
Can this tool fix malformed JSON automatically?
Yes! Our Auto-Repair engine fixes common mistakes that break standard JSON parsers, including single quotes, missing quotes around keys, trailing commas in objects or arrays, JavaScript comments, and Python boolean literals (True, False, None).
Is my data secure when using Easy JSON Formatter?
Yes, 100%. Processing takes place entirely within your browser runtime. You can even disconnect your internet or use this website offline, and all formatting, validation, and type generation will work flawlessly.