JSON Viewer & Formatter – Format, Beautify & Validate JSON Online
Paste raw, minified, or malformed JSON and instantly format it into a clean, colour-coded, collapsible tree view. Our free JSON formatter and beautifier validates your JSON in real time, highlights syntax errors with precise descriptions, and lets you minify, download, or copy the result in one click. Supports JSON Path extraction, URL import, and configurable indentation. Perfect for debugging API responses, inspecting package.json or tsconfig.json, and sharing readable data with your team. 100% in-browser - your data never leaves your device.
The parsed JSON will appear here
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, language-independent data interchange format. It is built on two universal data structures: objects (key–value pairs) and arrays (ordered lists). JSON is the backbone of REST APIs, configuration files, and NoSQL databases like MongoDB and Firebase.
Originally derived from JavaScript, JSON is now natively supported by virtually every programming language - Python, Go, Rust, PHP, Java, C#, and more.
JSON Syntax Rules
- Data in key/value pairs:
"name": "value" - Keys must be strings in double quotes
- Values: string, number, boolean, null, array, or object
- Arrays use
[ ], objects use{ } - No trailing commas - a common source of parse errors
- No comments are allowed in standard JSON
Tips & Tricks
- Use Format to beautify minified JSON at one click
- Collapse and expand nested objects with the arrow icons
- Copy formatted output to clipboard instantly
- Paste directly from Postman, cURL, or browser DevTools
- Your data never leaves the browser
When to Use a JSON Formatter
API Debugging
Format JSON responses from Postman, cURL, Insomnia, or browser DevTools for instant readability.
Config Files
Validate and beautify package.json, tsconfig.json, .eslintrc, and Terraform JSON files.
Data Exchange
Inspect and format JSON payloads between microservices, webhooks, and third-party APIs.
NoSQL Databases
View MongoDB, DynamoDB, Firestore, or CouchDB documents in a readable tree structure.
CI/CD Pipelines
Format GitHub Actions, CloudFormation, or Azure ARM template JSON before deployment.
GraphQL
Inspect deeply nested GraphQL query results and schema introspection responses.
Logs & Events
Parse structured JSON logs from CloudWatch, Datadog, or application logging pipelines.
JWT Payloads
Decode and format the JSON payload inside JWT tokens for auth debugging.
Frequently Asked Questions
Related Tools
Why JSON Formatting Matters for Modern Development
JSON (JavaScript Object Notation) has become the universal language of data exchange on the web. Every REST API, every configuration file, and every NoSQL database speaks JSON. Yet working with raw or minified JSON - stripped of whitespace and indentation for transmission efficiency - is nearly impossible without a formatting tool. A JSON viewer transforms dense, single-line payloads into a clean, colour-coded, hierarchically indented structure that developers can read, debug, and share in seconds. Whether you are inspecting a 200-line API response from Postman, troubleshooting a misconfigured tsconfig.json, or reviewing a MongoDB document, proper formatting is the first step toward understanding the data.
Common JSON Debugging Workflows
The most frequent use of a JSON viewer is debugging API responses. A typical workflow starts with copying a response from browser DevTools, cURL, or an API client, pasting it into the viewer, and immediately spotting structural issues - missing commas, mismatched brackets, or unexpected null values. Our viewer validates the JSON on paste, highlights syntax errors with precise line numbers, and lets you collapse and expand nested objects to focus on the section that matters. For large payloads, the tree view provides a navigable outline of the entire document. This is especially valuable when working with deeply nested structures common in GraphQL responses, Elasticsearch queries, and cloud infrastructure configurations like AWS CloudFormation or Terraform state files.
JSON in the Developer Ecosystem
Beyond API debugging, JSON is the backbone of modern developer tooling. Package managers use package.json, TypeScript uses tsconfig.json, ESLint uses .eslintrc.json, and VS Code stores all its settings in JSON. Understanding JSON structure and being able to quickly validate it saves hours of debugging configuration errors. DailyUtil offers a complete suite of data format tools: use the YAML Viewer for Kubernetes and Docker Compose files, the XML Viewer for SOAP and RSS feeds, the JWT Decoder to inspect Base64-encoded JSON payloads in authentication tokens, and the Base64 Tool for encoding and decoding data. For API testing, try the API Request Builder. Explore all tools on the homepage or learn more about DailyUtil.