JSON Toolkit

JSON Toolkit — everything JSON in one workspace

The DevBench JSON workspace is a full-featured, browser-based JSON editor. Format and validate JSON with real-time error highlighting, explore any object in the interactive tree view, compare two JSON documents with structural diff, and export to YAML, CSV, TypeScript interfaces, XML, or TOML in one click. All processing happens client-side — your JSON never leaves your device.

Features

• Format & minify — pretty-print with configurable indent (2 or 4 spaces) or minify to a single line
• Validate & repair — line/column errors, one-click auto-fix (trailing commas, missing commas, truncated JSON, LLM markdown, over-escaped quotes) with try-an-example chips — also at /json/repair
• Load from URL — paste a link or open /json?url=… / ?json=…
• Tree view — collapse and expand nested objects and arrays; copy any subtree as JSON
• JSON Diff — compare two JSON documents and highlight structural differences
• Export — convert to YAML, CSV, TypeScript interfaces, XML, TOML, or Base64
• JSON Schema validation — paste a schema to validate your document against it
• AES-256-GCM encryption — encrypt sensitive JSON payloads with a password, client-side only
• NDJSON / JSON Lines — parse and format newline-delimited JSON streams

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, human-readable data interchange format defined in RFC 8259. It supports six value types: strings, numbers, booleans, null, arrays, and objects. JSON has become the de-facto standard for REST API responses, config files, database documents (MongoDB, Firestore), and data exchange between services.