Format, validate, compare, fix, and convert JSON — 100% free, 100% private, runs entirely in your browser.
Pretty-print, minify, and validate JSON with syntax highlighting and instant error detection.
Compare two JSON objects side-by-side with color-coded difference highlighting.
Automatically repair broken JSON — fix missing commas, quotes, brackets, and more.
Explore JSON in an expandable tree with search, path copying, and key/value highlighting.
Convert between JSON arrays and CSV in either direction with preview table and download.
Convert between XML and JSON with attribute support, nested elements, and proper formatting.
Convert JSON arrays to Excel files with nested object flattening and instant download.
Convert between JSON and YAML in either direction with proper indentation and type handling.
Generate TypeScript interfaces from JSON with proper types and nested object support.
Generate JSON Schema with types, required fields, and nested definitions.
Decode and inspect JSON Web Tokens — view header, payload, expiry, and claims.
Encode text to Base64 or decode Base64 back to readable text instantly.
Use JSONPath expressions to extract and filter specific data from JSON documents.
Upload multiple JSON files and convert them all at once. Download as ZIP.
JSON (JavaScript Object Notation) is a lightweight, text-based data format that has become the standard for data exchange on the web. Despite its JavaScript origins, JSON is language-independent and supported by virtually every programming language including Python, Java, C#, Go, Ruby, and PHP — as defined in the ECMA-404 standard.
Created by Douglas Crockford in the early 2000s, JSON was designed as a simpler alternative to XML. Its human-readable syntax and minimal overhead made it the preferred format for REST APIs, configuration files, and data storage. The format is also standardized as RFC 8259 by the IETF.
JSON supports six data types: strings, numbers, booleans, null, arrays, and objects. These building blocks can represent virtually any data structure, from simple key-value pairs to complex nested hierarchies.
Read the full guide →Working with JSON often means encountering syntax errors. The most common mistakes include trailing commas after the last element, using single quotes instead of double quotes, unquoted property names, and missing or mismatched brackets.
Unlike JavaScript objects, JSON has strict rules defined in the official JSON specification: all strings must use double quotes, no comments are allowed, and no trailing commas. A single misplaced character can break an entire document.
Our Auto-Fix JSON tool automatically repairs these common errors, converting invalid JavaScript objects to valid JSON and fixing structural problems that would otherwise require manual debugging.
Learn about JSON errors →JSON, XML, and YAML all serve similar purposes but have different strengths. JSON excels in web APIs due to its compact size and native JavaScript support. XML remains popular in enterprise systems and offers features like namespaces, schemas, and attributes.
YAML prioritizes human readability with its indentation-based syntax, making it the preferred choice for configuration files in tools like Docker, Kubernetes, and GitHub Actions. However, YAML's flexibility can introduce subtle bugs through incorrect indentation.
Our converter tools help you transform data between these formats: JSON ↔ XML and JSON ↔ YAML handle the conversion while preserving data integrity.
Compare data formats →When working with JSON from external sources, security matters. Never use eval() to parse JSON — always use JSON.parse() which safely handles the data without executing code, as recommended by MDN Web Docs.
Validate JSON structure before processing, especially when handling user input or API responses. JSON Schema provides a powerful way to define and validate the expected structure, types, and constraints of your data.
Our tools process everything client-side — your JSON data never leaves your browser. This makes JSON Suite safe for handling sensitive configuration files, API keys, and private data that shouldn't be uploaded to third-party servers.
API best practices →Paste your JSON directly, drag and drop a file, or fetch from a URL. We support files up to 10MB.
All processing happens in your browser using JavaScript. No server uploads, no waiting, no privacy concerns.
Copy the result to your clipboard with one click, or download as a file. Share via URL for collaboration.
Debug API responses, format configuration files, and validate JSON payloads before deployment. Our formatter and validator catch errors before they reach production.
Convert JSON exports to CSV or Excel for analysis in spreadsheet tools. Transform data between formats without writing code or installing software.
Decode and inspect JWTs, analyze API payloads, and work with sensitive data safely. Everything stays local — we never transmit your data to external servers.
Learn JSON structure through our tree viewer, understand data formats, and practice with real examples. Our blog provides tutorials and explanations for beginners.
Yes, JSON Suite is completely free with no hidden costs, premium tiers, or usage limits. All tools work without registration or sign-up. We sustain the service through non-intrusive advertising.
Your data never leaves your browser. All processing happens client-side using JavaScript — we don't have servers that receive, store, or transmit your JSON. This makes JSON Suite safe for sensitive data like API keys, authentication tokens, and private configurations.
Most tools handle JSON files up to 10MB comfortably. Performance depends on your browser and device resources. For very large files exceeding this limit, we recommend processing in chunks or using command-line tools like jq.
Yes, JSON Suite is a Progressive Web App (PWA). After your first visit, all tools are cached locally and work without an internet connection. You can also install it as a standalone app on desktop or mobile devices.
Paste your JSON into our JSON Formatter, and it will instantly pretty-print it with proper indentation and syntax highlighting. You can also minify, validate, and download the result — all in one tool.
Yes, our Auto-Fix JSON tool repairs common syntax errors including missing commas, single quotes, trailing commas, and unquoted keys. It can convert JavaScript objects to valid JSON automatically.
Use our JSON to CSV converter or JSON to Excel converter. Paste your JSON array, preview the table, and download as CSV or XLSX. Nested objects are automatically flattened into columns.