Free Developer Tools — JSON, Base64, Hash, URL Encoder
Essential developer utilities that run entirely in your browser. No code, no data, and no credentials are ever uploaded to a server. Safe for working with sensitive API keys, authentication tokens, and private data.
JSON Formatter & Validator
Paste raw JSON to format it with indentation, syntax highlighting, and structure validation. Instantly identify malformed JSON with error line indicators. Collapse and expand nested objects. Essential for debugging API responses.
Base64 Encoder/Decoder
Encode text or binary data to Base64 and decode Base64 strings back to plain text. Used extensively in web authentication (Basic Auth headers), email attachments (MIME), and data URI schemes for embedding images in CSS/HTML.
URL Encoder/Decoder
Encode special characters in URLs (percent-encoding) or decode encoded URL strings back to readable text. Essential for debugging redirect chains, API query parameters, and form submissions.
Hash Generator (MD5, SHA-1, SHA-256, SHA-512)
Generate cryptographic hash digests for text strings. Useful for verifying file integrity, checking password hashes, and understanding hash-based data structures. All hashing runs locally using the Web Crypto API.
Related: Text Tools · Code Editor