JSON Formatter & Viewer - Editor, Query & Diff

All-in-one JSON tool: auto-format, repair broken JSON, query with JMESPath & JSONPath, compare diffs and convert to 12+ languages.

An all-in-one JSON workbench designed to format, validate, query, diff, and inspect JSON data directly in your browser. Whether you are debugging REST or GraphQL APIs, analyzing large datasets, or generating data models, JSON Studio provides a fast, privacy-first developer workspace without needing external websites or command-line tools. KEY CAPABILITIES 1. SMART AUTO-FORMATTER & SYNTAX REPAIR • Instantly clean and beautify raw JSON with customizable indentations (2-space, 4-space, or minified). • 1-click syntax repair: automatically resolves common formatting mistakes such as unquoted keys, trailing commas, single-quoted strings, and JavaScript-style comments. • Real-time error detection with exact line and column indicators. • Reversible escaping: quickly switch between escaped string literals and structured JSON. • Full undo and redo history (Ctrl+Z / Cmd+Z) so you never lose edits. 2. IN-BROWSER PAGE VIEWER & SPREADSHEET TABLE • Automatically detects hosted JSON API endpoints and renders them in an interactive viewer. • Interactive collapsible tree view with depth-level controls and visual hierarchy guides. • Spreadsheet Table View: effortlessly transform arrays of objects into sortable data tables with export options. • Bottom breadcrumb navigator: view exact object paths and copy keys or values with one click. • Fast key and value search with match counters and keyboard navigation. 3. INTEGRATED QUERY & FILTER ENGINE • Filter, slice, and reshape complex payloads using JMESPath or JSONPath expressions. • Real-time property autocomplete suggestions to navigate nested structures without guessing field names. • Built-in cheatsheet with practical query examples covering projections, conditional filters, and array slices. • Save frequently used queries and review execution history. 4. VISUAL SIDE-BY-SIDE DIFF COMPARISON • Compare two payloads side-by-side to immediately spot additions, deletions, and modified values. • Color-coded highlights make schema and data changes clear at a glance. • Summary counter showing exact additions, removals, and modifications between versions. 5. CODE GENERATION & SCHEMA TOOLS • Transform JSON objects into strongly-typed models, data structures, and classes for popular frontend and backend languages. • Schema validation: generate and test compliant schemas directly against your payloads. • Export data seamlessly between structured text, tabular data, and document formats. 6. OFFLINE DEVELOPER TOOLS • JWT Token Inspector: view token headers, claims payloads, and expiration times. • Base64 encoder and decoder. • Payload metrics: quickly inspect file size, tree depth, and total node count. PRIVACY & SECURITY • 100% local processing: all formatting, querying, diffing, and conversions happen entirely on your device. • Zero telemetry, zero external tracking, and zero remote servers. • Functions completely offline and requires no account or registration. KEYBOARD SHORTCUTS • Format JSON: Ctrl + Shift + F (Cmd + Shift + F) • Run Query: Ctrl + Enter (Cmd + Enter) • Undo Changes: Ctrl + Z (Cmd + Z)