ToolZeno

MIME Type Lookup

Instant search, browse, compare, and analyze MIME (Media) types, file extensions, Content-Type HTTP headers, browser handling rules, and security notes.

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Export & Quick Actions

applicationIANA Registered
RFC Specification

application/json

JSON (JavaScript Object Notation)

Lightweight, human-readable data interchange format widely used in REST APIs, configuration files, and Web APIs.

Primary Extension:.jsonAlternatives:.map

Browser Support & Handling

Browsers display JSON inline formatted or raw, depending on built-in dev tools or extensions.

Inline RenderingSupported
Script ExecutionSafe (No JS)

Standard HTTP Headers

Content-Type

Content-Type: application/json; charset=utf-8

Accept

Accept: application/json

Multi-Language HTTP Snippets

curl -i -X GET \
  -H "Accept: application/json" \
  -H "Content-Type: application/json; charset=utf-8" \
  https://api.example.com/resource

Security Notes & Best Practices

JSON Hijacking & Content Sniffing

medium risk

Vulnerable to cross-site script injection if returned with text/html or without anti-sniffing headers.

Recommendation: Always set Content-Type: application/json; charset=utf-8 and X-Content-Type-Options: nosniff header.

Real-World Use Cases

  • 1RESTful API responses & payloads
  • 2Software config files (package.json, tsconfig.json)
  • 3NoSQL document storage

Related MIME Types

What is the Mime Type Lookup?

Overview and core technical concepts

The Mime Type Lookup is a professional, client-side utility designed to streamline mime type lookup tasks with instant processing, privacy guarantees, and customizable options.

100% Private client-side execution
Instant real-time output preview
Flexible formatting and parameter controls
Zero data sent to external servers

Why Use the Mime Type Lookup?

Key advantages, developer speedups, and security benefits

Speed & Reliability

Execute calculations and transformations instantly in your local browser memory.

Enterprise Data Privacy

Your data stays on your local device, meeting strict data compliance requirements.

When to Consider Alternatives?

Anti-patterns, limitations, and when to choose an alternative approach

Legacy Offline Environments

This tool is optimized for modern web browsers supporting Web Cryptography & WebAssembly standards.

Recommended Alternative: Developer Tools

Mime Type Lookup Example

Sample inputs, expected outputs, and code patterns

Sample Usage Output

Expected Output
Generated result using Mime Type Lookup parameters.

Common Mime Type Lookup Mistakes

Frequent errors, security risks, and how to fix them

Unvalidated Parameters
The Mistake:Entering invalid syntax or malformed inputs.
The Impact:Can cause parsing warnings or unexpected outputs.
How to Fix:Review validation messages and double-check your input values before processing.

Frequently Asked Questions

A MIME type (Multipurpose Internet Mail Extensions), also known as a Media Type, is a standardized 2-part string identifier used by internet protocols and web browsers to declare the format and nature of a document or file stream (e.g., application/json or image/png).

A file extension (such as .json or .png) is a operating system naming convention appended to a filename. A MIME type is an authoritative HTTP header sent by web servers over network protocols (Content-Type header) instructing client browsers how to process and render payload bytes regardless of file extension.

The Content-Type header informs the receiver about the MIME type of the HTTP body payload being sent in the current request or response. The Accept header is sent by clients in HTTP requests to negotiate which MIME format the client expects or prefers back from the server (Content Negotiation).

MIME Sniffing is a browser behavior where the browser inspects the actual byte stream of a response to determine its format if the server omits or sends an incorrect Content-Type header. If an attacker uploads a malicious script disguised as an image, MIME sniffing can execute XSS scripts. Serving the X-Content-Type-Options: nosniff header prevents browser sniffing.

No. The ToolZeno MIME Type Lookup operates 100% client-side inside your web browser. All dataset search matching, category filtering, HTTP snippet generation, and comparison matrices execute locally in browser memory without network transmissions.

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