Developer Toolbox: Quick JSON, Base64, URL, and SHA Tools for Developers

The essential data conversion tools most often needed for software development, API integration, debugging, and system administration are gathered in one lightweight panel.

HesapYap Developer Toolbox; handles JSON formatting and minification, UTF-8-compatible Base64 encoding/decoding, URL parameter conversion, and cryptographic SHA-256 hash generation entirely in your browser (client-side) . None of your input is sent to a server, stored, or transmitted over the network.

1. JSON Formatter, Minifier, and Validator

REST API responses, Docker configurations, and NoSQL database records are often transmitted as single-line (minified) JSON strings. Reading this data, parsing nested keys, or finding syntax (syntax) errors can be difficult.

Pretty Print (Format): Converts complex JSON into hierarchical, readable blocks with standard 2-space indentation.

Minify (Compress): Removes unnecessary spaces, tabs, and line breaks to prepare JSON for network transfer or single-line environment variables.

Live Validation (Validator): Immediately detects missing commas, unclosed brackets, or quotation mark errors and reports the exact location of the parsing (parse) error.

// Raw / Minified JSON
{"project":"HesapYap","active":true,"modules":["JSON","Base64","SHA"]}
// Formatted (Pretty Print) JSON
{
  "project": "HesapYap",
  "active": true,
  "modules": [
    "JSON",
    "Base64",
    "SHA"
  ]
}

Standards: RFC 8259 and ECMA-404 JSON Data Interchange Format.

2. UTF-8-Compatible Base64 Encoding and Decoding (Encode / Decode)

Base64 is an encoding algorithm that represents binary (binary) or text data using only 64 safe ASCII characters (A-Z, a-z, 0-9, +, /).

Important Reminder: Base64 is not an encryption method. It does not conceal the data's contents; it only ensures intact transfer through data protocols (HTTP Headers, Basic Auth, Data URI, email attachments).

The standard JavaScript btoa function fails with Turkish characters and emojis (because they exceed the Latin-1 range). Our tool uses full UTF-8 byte mapping (TextEncoder / TextDecoder), so Turkish characters (ç, ğ, ı, ö, ş, ü) and special symbols can be converted to and from Base64 without corruption.

Standard: RFC 4648 Base64 Data Encoding.

3. URL Encode and URL Decode (Percent Encoding)

When spaces, Turkish letters, or query parameter separators (&, ?, =, #, /) are used directly as raw text in web addresses (URLs), browsers and web servers may confuse parameter boundaries.

URL encoding (Percent-encoding) converts potentially problematic characters into a % sign followed by their hexadecimal (hex) byte value:

Raw Text: arama=hesapyap & araçlar=yeni

URL Encoded Equivalent: arama%3Dhesapyap%20%26%20ara%C3%A7lar%3Dyeni

Our tool follows JavaScript's encodeURIComponent standard. This lets you safely format variable values for URL query strings (query parameters) in API requests.

Standard: RFC 3986 URI Generic Syntax.

4. Cryptographic SHA-256 and SHA-1 Hash Generator

Cryptographic hash functions (hash functions) produce a unique, fixed-length digest from any text input, regardless of its size.

SHA-256: Produces a 256-bit digest (64 hexadecimal characters). It is the current security standard for data integrity verification, API signing (HMAC infrastructure), and blockchain architectures.

SHA-1: Produces a 160-bit digest (40 hexadecimal characters). Because of collision (collision) vulnerabilities, it should not be used for security in new projects; use it only for legacy system integration or checksum comparisons.

Basic Rules of Hash Functions:

One-Way: It is mathematically impossible to recover the original text from the generated SHA-256 output.

Avalanche Effect: Changing a single letter or period in the input completely changes the resulting hash.

Password Storage Note: Plain SHA-256 alone is unsuitable for storing user passwords in a database. Secure password storage should combine salting (salting) with deliberately slow algorithms (Argon2, bcrypt, or PBKDF2).

5. Privacy and Client-Side Security

Security is the most critical concern for a developer tool. Production tokens, configuration keys, or database exports should not be sent to third-party servers.

Zero Network Requests: Our tool performs all conversions using your browser's native JSON.parse, TextEncoder and the hardware-accelerated engine available in modern browsers through the Web Crypto API (crypto.subtle.digest).

Clicking Convert does not send an HTTP/XHR request to a server.

Recommendation: Even with local tools, good security practice is to avoid processing live production secret keys or sensitive customer data in general-purpose browsers.

Frequently Asked Questions

Why does my JSON data produce an "Invalid JSON" error? JSON has a strict syntax standard. Common errors include using single instead of double quotation marks for key names, omitting double quotation marks around text values, leaving an unnecessary comma after the final item (trailing comma), or writing non-numeric values without quotation marks.

Why is Base64 data larger than the original text? The Base64 algorithm converts every 3 bytes of binary data into 4 ASCII characters. This causes the file or text size to increase by approximately 33% .

Why should I encode only the parameter rather than the entire URL? https://hesapyap.net/ara?q=test is an example of a full URL. If you encode it directly, the colon and slashes in the https:// protocol also become %3A%2F%2F . This prevents the address from working as a clickable web link. Only the parameter value after q= should be encoded.

Legal and Technical Standards

IETF RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format.

IETF RFC 4648: The Base16, Base32, and Base64 Data Encodings.

IETF RFC 3986: Uniform Resource Identifier (URI): Generic Syntax.

W3C Web Cryptography API Standard: Browser-based cryptographic hashing and key management.

Developer Toolbox: JSON, Base64, URL and SHA Tools