ViewJSON

About ViewJSON

ViewJSON is a browser-based JSON editor that detects and renders Base64-encoded media inline within JSON data, displaying images, audio, video, and PDF content directly instead of showing raw encoded strings. It uses magic number detection to identify over 15 formats, including PNG, JPEG, GIF, WebP, BMP, and ICO images; MP3, WAV, OGG, M4A, and FLAC audio; MP4, WebM, AVI, and MOV video; and PDF documents. The editor is built on CodeMirror 6 and reads only value boundaries for Base64 detection rather than decoding full content upfront, allowing it to remain responsive with large JSON files containing embedded assets.

The tool includes a variable system for inserting named placeholders into JSON values that get substituted on export, copy, or share; an API Request Builder for constructing HTTP requests with custom headers and exporting them as cURL or HTTP format; and automatic browser-history saving of JSON with a sidebar for restoring previous versions. Sharing works through client-side AES-GCM encryption, where JSON content is encrypted in the browser before upload, the server stores only ciphertext, and the decryption key is appended to the share link's URL hash. All Base64 decoding, media rendering, and encryption take place locally in the browser, so plaintext data is not sent to the server during normal use.

The product is intended for developers working with multimodal AI APIs — including OCR, text-to-speech, image generation, and vision models — that return Base64-encoded media inside JSON responses, letting them inspect that media without manually extracting and decoding each field. Core features, including JSON formatting, Base64 media preview, sharing, and history, are available without creating an account.

Key features

• Automatically detects and renders Base64-encoded images, audio, video, and PDF inline within JSON
• Quick asset replacement — paste a new image to auto-convert and swap Base64 values
• Secure sharing via client-side AES-GCM encryption, with decryption key kept only in the URL hash
• API Request Builder for constructing HTTP requests and copying as cURL or HTTP format
• Automatically saves JSON to browser history with version restore

Frequently asked questions