TOON Studio
Convert JSON to Token-Oriented Object Notation (TOON) and vice-versa with visual syntax highlighting.
Token-Oriented Object Notation (TOON) Compression
Token-Oriented Object Notation (TOON) is a custom lightweight data serialization format. It is designed to optimize structured JSON objects for Large Language Models (LLMs) like ChatGPT, Claude, and Gemini. By converting JSON keys and values into compact, type-prefixed strings, TOON reduces prompt sizes, decreases request latency, and lowers API usage costs.
How TOON Works
Traditional JSON uses extensive double quotes, brackets, and colons that consume precious tokens in AI contexts. TOON strips these characters, prefixing keys and values with shorthand type markers like str::, int::, float::, bool::, null::, arr::, and obj::.
Prompt Token Optimization
For large JSON data objects, standard formats waste up to 35% of the token context window on syntactic overhead. Converting data to TOON notation provides identical semantic context to the AI model while reclaiming critical context length for responses.
Official TOON Studio
Convert JSON to Official TOON (Indentation & Tabular Arrays) and vice-versa, saving massive token space for LLM prompts.
Official TOON Notation & Tabular Arrays
Official TOON notation takes LLM prompt compression to the next level by introducing YAML-like structural indentation and advanced tabular array serialization. Instead of repeating key names across multiple records, Official TOON defines schema column headers and compresses dataset arrays into lightweight CSV-style blocks.
Tabular Structure Optimization
When dealing with rows of data (e.g. database query outputs or API response list objects), the schema is defined once as a header block, e.g. [N]{field1,field2}. Subsequent rows are listed as plain comma-separated values, eliminating redundant syntax from every item.
Maximizing AI Context Windows
By stripping nested brackets and recurring strings, Official TOON achieves up to 50% decrease in input token length. This allows developers to pass larger datasets and longer tables directly into prompt context windows without exceeding LLM limits.
Format & Minify JSON / TOON
Pretty-print or compress your JSON or TOON payloads, with real-time validation feedback.
Secure Client-Side JSON & TOON Formatting
The JSON Formatter and Beautifier is a lightweight utility designed to clean up, validate, and prettify standard JSON strings or custom TOON schemas. Prettify minified API payloads with standard indents (2, 4, or 8 spaces), search elements using interactive Tree Views, or compile objects back into clean compact structures.
Local Data Safety
Data privacy is critical for developers. This formatter processes all inputs locally in your browser. No payload strings, configurations, or JSON data are ever logged or uploaded to external servers, providing full security.
Linter & Syntax Highlighting
The validator compiles JSON and TOON code, highlighting syntax errors with exact line numbers. It helps identify missing quotes, mismatched brackets, or bad characters instantly during development.
XML Studio
Format, minify, and validate your XML documents with structural and hierarchical feedback.
Free XML Studio — Format, Validate and Minify XML Online
XML Studio is a robust, lightweight utility designed to help developers clean up, align, parse, and validate XML documents in real-time. Prettify raw XML elements with custom indents (2, 4, or 8 spaces), strip all whitespace to minify markup size, or check structural errors instantly.
XML Validation & Tag Checking
Our XML linter verifies documents against markup specifications, detecting tag mismatches, unclosed elements, and unescaped quote configurations, showing precise parser error messages.
Fully Client-Side XML Formatting
Your data stays safe in your browser. All formatting and validation processes happen locally in memory, making it highly secure for corporate network configurations and config payloads.
JSONPath Query Evaluator
Extract values or filter arrays from your JSON document using standard path selectors.
Free JSONPath Query Evaluator & Selector Tester
JSONPath Query Evaluator is a developer utility designed to filter, extract, and parse nested values from complex JSON documents. Use standard dot-notation and wildcard expressions to slice arrays, retrieve properties, and isolate specific subsets of objects instantly without writing custom parser code.
JSONPath Selector Syntax
Supports standard JSONPath operators, including wildcards (*), array indices, multi-level keys, and descendant search patterns. Quickly debug complex API responses and verify selectors before using them in code.
100% Client-Side Processing
All JSON parsing and evaluation actions occur in memory inside your browser. No payload strings, configurations, or JSON data are ever logged or uploaded to external servers, providing full security.
Format Converter (CSV / YAML / JSON / XML)
Seamlessly convert structured data back and forth between CSV, YAML, JSON, and XML formats.
Universal Format Converter — JSON, XML, YAML and CSV
The Format Converter is a multi-format translation tool that operates entirely in the browser. Translate config files and datasets bi-directionally between CSV spreadsheets, YAML configurations, JSON objects, and XML elements in a single click.
Bi-directional Conversions
Convert database exports (CSV) into JSON lists for API endpoints, parse Kubernetes config sheets (YAML) into standard objects, or export XML structures to standard configurations instantly with proper nesting and formatting preservation.
Secure Local Parsing
Like all utilities on JSON-TOON, conversion parsing happens client-side using JavaScript. Your sensitive configuration schemas, credentials, and user tables are never sent across the network, ensuring top enterprise security.
JSON Diff Checker
Compare two JSON strings to highlight additions (green) and deletions (red) side-by-side.
Free Side-by-Side JSON Diff Checker
JSON Diff Checker is an online tool that compares two JSON objects and highlights differences side-by-side. Quickly inspect API payload variations, spot structural configuration changes, and track additions (green highlights) and deletions (red highlights) instantly.
Line-by-Line Visual Comparison
Our diff tool parses the structure of both JSON blocks, formats them, and highlights exactly what values, array indices, or object keys changed. Save hours of manual inspection when debugging large config changes.
Private and Secure Client-Side Diff
All comparisons are calculated locally inside your browser using standard JavaScript diff engines. No data is sent over the network, making it highly secure for comparing sensitive server logs or API credentials.
Collapsible Tree Viewer
Analyze and navigate massive nested JSON or XML documents visually with collapsible nodes.
Interactive JSON & XML Tree Viewer
The Collapsible Tree Viewer is a visual navigation utility designed to help developers browse, search, and map complex nested JSON objects and XML elements. Collapse or expand nodes, filter keys instantly using our real-time search, and analyze deep nested structures without losing context.
Navigate Large Datasets Visually
When dealing with giant server responses, raw text blocks are hard to comprehend. The Tree Viewer translates this text into an interactive collapsible hierarchy, complete with key-value data-type formatting and instant sub-node folding.
Privacy & Speed in Browser
Data analysis occurs fully client-side inside the browser memory. No payload strings, configurations, or JSON data are ever logged or uploaded to external servers, providing full security.
JSON Schema Validator
Validate your JSON documents against standard JSON schemas (Draft-07/2020-12).
Free JSON Schema Validator & Compliance Tester
JSON Schema Validator is an online utility designed to validate JSON data documents against standard draft schemas. Test structural rules, property data types, limits, and configurations with instant compliance validation powered by the industry-standard AJV validator.
Supports Draft-07 & Draft 2020-12
Validate objects against standard rulesets including type assertions, required keys, min/max numbers, string patterns, and nested schema references. Detailed compilation and parsing error reports highlight why validation failed.
Private and Secure Validation
Like all utilities on JSON-TOON, validation processing is fully secure and client-side. No configuration files, code payloads, or data instances are ever uploaded, keeping your data strictly confidential.
Encoder, Decoder & String Escaper
Encode, decode, escape, or unescape strings for code literals, URL paths, HTML entities, Hex, and Base64 structures.
Free Online Developer Encoder & Decoder Studio
The Encoder, Decoder & String Escaper is a multi-format conversion studio. Instantly convert payloads and format text strings between URL percent encoding, Base64 blocks, Hexadecimal codes, HTML entities, and programming language escape strings.
Comprehensive Encoding Utilities
Percent encode query arguments for REST calls, encode or decode authorization headers in Base64 format, translate byte strings to Hex strings, escape code symbols, or render HTML character mappings safely in visual code layouts.
Secure Client-Side Operations
All operations run completely client-side in Javascript. Your raw passwords, API auth tokens, text files, and binary structures are never sent across the internet, ensuring full safety.
Mock Data Generator
Instantly generate high-quality dummy datasets formatted in JSON, XML, YAML, CSV, or TOON configurations.
Free Mock Data Generator & Dummy Database Creator
The Mock Data Generator is an online developer tool designed to generate custom mock datasets for testing APIs, populating databases, or benchmarking applications. Choose from standard templates, define custom record sizes, and export data instantly in JSON, XML, YAML, CSV, or TOON notations.
Flexible Schema Templates
Instantly compile complex mock databases for user profile collections (with fake names, emails, and active flags), server log streams (with levels, HTTP methods, paths, and status codes), or e-commerce product catalogs.
Fast Client-Side Generation
All mock records are generated locally in your browser memory. No data is stored or uploaded to external servers, providing full speed and enterprise privacy compliance.