JSON Toolkit & Utilities
Comprehensive client-side toolset for formatting, converting, validating, anonymizing, and generating code from JSON data.
JSON Validator & Formatter
Validate syntax in real time with line-by-line error location, format with custom indentation, sort keys, compress, and inspect your data securely inside your browser.
JSON (JavaScript Object Notation) is the standard data interchange format on the web. Validating JSON ensures your data contains no missing braces, unquoted keys, trailing commas, or invalid character encodings before transmitting it to APIs or storing it in databases. JSONBox parses and formats your data 100% locally in your browser with zero network transmission.
JSON ↔ YAML Converter
Convert between JSON and YAML effortlessly. Ideal for Docker Compose files, Kubernetes manifests, GitHub Actions, and OpenAPI specifications.
YAML (YAML Ain't Markup Language) is a human-friendly data serialization standard commonly used in modern DevOps configuration. JSONBox preserves mapping keys, lists, numbers, booleans, and multi-line strings with strict indentation preservation.
JSON ↔ XML Converter
Bidirectional conversion between JSON and XML documents with intelligent handling of attributes (@attr) and element hierarchy.
JSON ↔ JSONL (NDJSON) Converter
Convert JSON arrays to Newline-Delimited JSON (JSONL / NDJSON) and back. Standard format for LLM training data, Elasticsearch, and high-volume logging.
JSON ↔ URL Query Parameters
Transform nested JSON objects into URL query parameter strings and parse encoded query parameters back into structured JSON.
JSON Flatten & Unflatten
Transform deep nested objects into flat dot-notation key-value pairs (e.g. user.address.city) or reconstruct deeply nested structures from flat keys.
JSON String Escape & Unescape
Convert JSON into escaped string literals (with backslashes \" for embedding in source code, SQL, or shell commands) or unescape stringified JSON logs.
JSON Data Masking & PII Redactor
Protect user privacy before sharing API logs, crash reports, or customer data. Automatically mask or redact emails, phone numbers, credit cards, passwords, and custom secret keys.
JSON to JSON Schema Generator
Generate standardized JSON Schema (Draft-07) automatically from your JSON payloads. Automatically infers field types, required fields, and formats (email, date-time, uri, uuid).
Multi-Language Code Generator
Instantly generate strongly-typed models, structs, classes, and database schemas from any JSON payload.
Mock JSON Data Generator
Generate realistic, production-ready sample JSON datasets on the fly for frontend prototypes, unit testing, and API simulations.
cURL to JSON Parser
Paste a raw curl command to automatically extract and format the HTTP request method, target URL, request headers, and JSON body payload.
JSON ↔ CSV Converter
Convert structured JSON arrays into CSV spreadsheets or parse tabular CSV files back into JSON objects.
Interactive JSON Tree Viewer
Explore and navigate large, complex JSON data with an expandable visual node tree.
JSON Diff Comparator
Compare two JSON documents side by side with semantic, line-by-line visual difference highlighting.
JSONPath Query & Evaluator
Extract, filter, and slice elements using standard JSONPath syntax — e.g. $.store.book[?(@.price < 10)].title or $..author.
JSON Syntax Auto-Repair
Automatically fix malformed JSON with missing property quotes, trailing commas, single-quoted strings, JavaScript comments, and NaN/undefined literals.
JWT Debugger & Decoder
Decode and inspect JSON Web Tokens (JWT) safely. View header algorithms, payload claims, and expiration dates in plain JSON.
Base64 ↔ JSON Converter
Encode JSON text to Base64 format or decode Base64 strings back into formatted JSON.
JSON Schema Validator
Validate JSON data against a JSON Schema (Draft-07) to verify required properties, data types, string patterns, and number ranges.
JSON Token & Byte Counter
Estimate LLM token usage (OpenAI, Claude, Gemini) and analyze memory footprint for prompt engineering.
Privacy Policy & Terms of Service
Last Updated: August 2026
All JSON formatting, conversion, validation, and code generation executes exclusively inside your local browser sandbox.
Your payload data, tokens, passwords, and JSON documents are never transmitted to, logged by, or stored on any server.
Enjoy instant, unrestricted access to all 20+ developer utilities without providing an email, account, or personal identity.
Zero personal data collection means your digital privacy rights and sovereignty are intrinsically respected and protected.
JSONBox is a free, web-based developer utility platform providing formatting, validation, conversion, schema generation, and code generation tools for software engineers, data analysts, and developers worldwide.
We strictly enforce a client-side only architecture. When you paste or load data into any tool on this platform (including the Validator, PII Masker, Diff Comparator, cURL Parser, JWT Decoder, or Code Generator), the data is parsed exclusively in your browser's JavaScript engine. No payload data is ever sent across the network.
JSONBox uses standard browser localStorage solely for user interface preferences, including dark/light theme selection, language choice, and an optional ephemeral history list for quick access. This data resides strictly on your local device and can be cleared at any time via the "Clear All History" button or by clearing your browser cache.
To support free operations and infrastructure maintenance, JSONBox may serve advertisements provided by Google AdSense and third-party advertising vendors. Google uses cookies (such as the DART cookie) to serve ads based on user visits to this site and other websites across the Internet. You may opt out of personalized advertising by visiting Google Ads Settings (https://adssettings.google.com) or aboutads.info.
All connections to JSONBox are enforced over modern HTTPS/TLS encryption. All hashing (SHA algorithms) and data redaction functions utilize the browser's native Web Cryptography API, ensuring cryptographically sound, zero-leak processing.
JSONBox and its generated code snippets, schema definitions, and mock datasets are provided "AS IS" without warranty of any kind. Developers are encouraged to review generated code and schemas prior to deployment in mission-critical production environments.
We may update this Privacy Policy from time to time to reflect evolving regulatory frameworks or web capabilities. Continued use of JSONBox constitutes acceptance of any updated terms.
-
◆
1. "AS IS" & "AS AVAILABLE" Basis: All tools, parsers, converters, formatters, schema generators, and utilities on JSONBox are provided on an "AS IS" and "AS AVAILABLE" basis without warranties of any kind, whether express, implied, statutory, or otherwise (including warranties of merchantability, fitness for a particular purpose, and non-infringement).
-
◆
2. Code Generation & Data Accuracy Disclaimer: Code generated across programming languages (TypeScript, Rust, Java, Kotlin, C#, Go, Python, SQL) and inferred schemas are designed for developer productivity and prototyping. We do not warrant that generated code is completely error-free or production-ready. Developers must perform thorough code reviews and testing prior to deployment.
-
◆
3. Data Redaction & Security Tools Disclaimer: The PII masking and redaction tools utilize pattern-matching heuristics. While designed to obscure common personal identifiers (emails, phone numbers, credit cards, passwords, API tokens), they do not guarantee detection of all sensitive records, nor do they constitute compliance certification for legal frameworks such as HIPAA, GDPR, or PCI-DSS.
-
◆
4. Total Limitation of Direct & Consequential Liability: Under no circumstances shall JSONBox, its maintainers, or contributors be liable for any direct, indirect, incidental, special, consequential, or punitive damages (including loss of data, loss of profits, system downtime, compiler errors, or business interruption) arising out of the use or inability to use this platform.
-
◆
5. External Links & Third-Party Advertisements: This site may display third-party advertisements (such as Google AdSense) or link to external resources. We do not endorse, monitor, or assume responsibility for the content, privacy practices, or goods/services provided by third-party websites.