JSON Formatter & Validator
Paste your JSON below, then format, validate, or compress it.
Click "Format" to see the result...
What is JSON Formatter?
A JSON formatter is a tool that takes raw, unformatted JSON data and transforms it into a well-structured, human-readable format. JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. When working with APIs or configuration files, JSON data often comes in a single line (minified). A formatter adds proper indentation, line breaks, and spacing to make the structure immediately visible.
Why Use Our Online JSON Tool?
- 100% Browser-Based — Your data never leaves your device. No server uploads, no privacy concerns.
- Free & Unlimited — No registration, no API keys, no rate limits. Use it as much as you need.
- Multiple Functions — Format, validate, minify, and copy — all in one place.
- No Ads Intrusion — Clean interface focused on getting your work done.
Common Use Cases
- Debugging REST API responses
- Reading configuration files (package.json, tsconfig, etc.)
- Preparing data for MongoDB or other NoSQL databases
- Validating JSON before using it in your application
- Teaching and learning JSON structure
JWT Decoder
Paste a JWT token to decode its header and payload. Your token is never sent to any server.
What is JWT?
JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It is widely used for authentication and authorization in web applications, single sign-on (SSO), and API security. A JWT consists of three parts: Header, Payload, and Signature, separated by dots.
How to Decode a JWT Token
Decoding a JWT is simple: paste your token into the input above and click "Decode". Our tool extracts and decodes the Base64-encoded Header and Payload, displaying them in a readable JSON format. Note: Decoding only reveals the contents — it does not verify the signature. Signature verification requires the secret key.
Common JWT Security Tips
- Never share your JWT tokens with untrusted parties
- Always validate tokens on the server side
- Use HTTPS to prevent token interception
- Set short expiration times (e.g., 15 minutes)
- Never store sensitive data in the payload — it is only base64-encoded, not encrypted