Fix broken JSON and validate AI and API output faster
Paste any AI output, tool-call payload, broken JSON, or API response. Format it, validate it, repair it, compare it, and turn it into a stronger schema without leaving the browser.
Quick JSON Workspace
A homepage launcher should solve the first developer job fast. That is usually formatting, validating, or repairing an AI or API payload, not browsing a tree view first.
Paste JSON and use it immediately
Use the full tools when you need deeper inspection, saving, or related workflows.
Indentation, sorting, history, and a full editor.
Exact error positions, repair suggestions, and stronger checks for copied output.
Tree, raw, and table views once the payload is valid.
Start with format, validate, or repair here, then move into JSON Viewer for deeper inspection.
Format Faster
Beautify minified AI and API payloads before you inspect them or diff them.
Privacy First
Most tools stay local in your browser. API Explorer proxy mode only forwards request data when you choose it.
45 Browser Tools
JSON formatters, schema tools, repair utilities, converters, and API helpers in one workspace.
AI + API Ready
Validate structured outputs, test endpoints, and inspect JSON responses when you need a fast repro.
Start with the task that blocked you
The fastest path to a fix depends on whether the problem is readability, syntax, schema drift, tool wrappers, or the request itself. JSONTech keeps those steps in one browser workspace.
Fix malformed AI JSON output
Repair comments, single quotes, trailing commas, and partial objects before validation.
Validate structured model output
Check whether the JSON actually matches the schema your app or agent expects.
Build provider-ready schemas
Generate OpenAI, Anthropic, MCP, or plain JSON Schema wrappers from sample output.
Test AI and tool endpoints
Replay JSON requests, tweak auth and headers, and inspect structured responses in one view.
Follow proven workflows, not just tool names
The new use-case pages package existing tools into concrete jobs developers already search for, which makes discovery and internal linking compound instead of depending on isolated tool pages.
Fix Malformed AI JSON Output Before Your Parser Fails
Repair broken model JSON, validate the cleaned payload, and confirm the response shape before it hits application code.
Validate LLM Structured Output Against a Schema
Check whether model JSON, tool-call arguments, or agent output actually matches the contract your app expects.
Build Structured Output Schemas for OpenAI, Anthropic, and MCP
Generate provider-ready schema wrappers from sample JSON so models and tools return predictable structured data.
Validate MCP Tool Definitions Before They Reach Your Server
Check MCP tool JSON, verify inputSchema, and catch common definition errors before they break a Model Context Protocol integration.
Core Tools
JSON Formatter
Beautify JSON from APIs, AI tools, and logs with configurable indentation
JSON Validator
Validate API and AI-generated JSON with detailed error messages and line numbers
JSON Viewer
Explore JSON with interactive tree, table, and raw views
JSON Minifier
Compress JSON by removing whitespace and formatting
JSON Compare
Compare JSON documents or model responses with structural diff view
Converters
JSON to CSV
Convert JSON arrays to CSV format for spreadsheets
CSV to JSON
Convert CSV data to structured JSON format
JSON to YAML
Convert JSON to YAML for config files and DevOps workflows
YAML to JSON
Convert YAML configuration to JSON format
JSON to XML
Convert JSON to XML for legacy system integrations
XML to JSON
Convert XML documents to JSON format
JSON to TypeScript
Generate TypeScript interfaces and types from JSON
JSON to Code
Generate typed code from JSON in 8 languages
JSON to HTML Table
Render JSON data as an HTML table
JSON Schema Generator
Generate JSON Schema from sample JSON for apps, APIs, and AI workflows
Developer Tools
JSONPath Tester
Test and evaluate JSONPath expressions against JSON data
JSON Schema Validator
Validate JSON, LLM outputs, and tool inputs against a JSON Schema
JSON Repair
Auto-fix malformed JSON from APIs, AI tools, and copied logs
JWT Decoder
Decode and inspect JWT tokens — header, payload, and expiry
Mock Data Generator
Generate realistic fake JSON data for testing and prototyping
API Explorer
Test REST APIs, AI endpoints, and tool-call payloads in your browser
Webhook Tester
Generate a unique URL and inspect incoming HTTP requests in real time
UUID Generator
Generate random UUID v4 values in bulk with copy-friendly output
Hash Generator
Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files
Timestamp Converter
Convert Unix epoch time to dates and back, with live clock
Text Diff & Compare
Line-by-line diff of two texts with additions, removals, and changes
Sitemap URL Extractor
Extract URLs from sitemap.xml or robots.txt — filter and export JSON, CSV, or text
llms.txt Builder
Build a starter llms.txt for AI crawlers from your URL list
Structured Output Schema Builder
Generate OpenAI, Anthropic, MCP, or plain JSON Schema wrappers from sample output
Anthropic Tool Input Builder
Build Claude tool definitions with `input_schema` from sample JSON input
MCP Tool Schema Validator
Validate MCP tool definitions and verify `inputSchema` before deployment
LLM JSON Output Validator
Repair and validate model JSON output against a schema
Code Formatters
HTML Formatter
Format, beautify, and minify HTML code online
HTML Editor
Write HTML, CSS, and JS with a live preview — in-browser playground
HTML Viewer
Paste HTML and instantly preview how it renders in a sandboxed frame
CSS Formatter
Format, beautify, and minify CSS stylesheets online
JS Formatter
Format, beautify, and minify JavaScript code online
SQL Formatter
Format and beautify SQL queries with dialect support
Regex Tester
Test regular expressions with real-time matching and highlighting
Visualization
Encoders
Common JSON debugging flows
Most issues are not isolated to one tool. Format, repair, validate, compare, and test requests in sequence instead of bouncing between websites.
Broken model JSON response
Repair the payload, validate the structure, then inspect the final JSON before you trust it.
Structured output drift
Generate the schema, validate the response, then compare retries to isolate contract drift.
New tool-call integration
Build the wrapper, validate the input or output shape, then test the endpoint before wiring it into code.
Learn the fixes behind the tools
Pair the tools with guides, examples, and reference content so the next payload or structured-output issue takes less time to unwind.
Why teams keep JSONTech bookmarked
Use JSONTech when you need to inspect AI output, tool-call payloads, or API JSON quickly with most work staying local in your browser. For CORS-blocked requests, API Explorer also offers an optional proxy mode that forwards the live request through JSONTech edge infrastructure without storing it.
Start with formatting or repair, validate the result against syntax or schema, then move into comparison, provider-specific wrappers, and endpoint testing without switching tools or losing context.
45 browser-based tools available today across JSON, schema, AI workflow, API, conversion, and debugging use cases.