Developer Tools for JSON, Security & DevOps

Compare two JSON documents and see exactly what changed — added, removed, or modified values with their JSON paths.

Escape plain text into a valid JSON string literal, decode an escaped literal back to readable text, and get a JavaScript-source-safe variant. No upload.

Pretty-print, validate, and minify JSON with configurable indentation, detailed error positions, and document statistics. Runs entirely in your browser.

Strip whitespace and comments from JSON in one click, then compare input vs output size and compression ratio. Ideal for URLs and shrinking API payloads.

Build JSON Schemas by dragging types and nesting properties. Supports enums, required fields and allOf/anyOf/oneOf. Exports to draft-07 or 2020-12. Free.

Generate a strict JSON Schema for LLM structured output. Create validation schemas for AI responses with support for required fields, enums, and nested objects.

Generate realistic sample JSON from a JSON Schema. Great for creating mock data, test fixtures, and LLM structured-output examples.

Validate JSON against a JSON Schema (draft 2020-12, 2019-09, draft-07) with detailed error messages. Ideal for LLM structured output and API contracts.

Sort object keys recursively, sort arrays alphabetically or numerically and dedupe items — then pretty-print the result with stats. Runs in your browser.

Analyze any JSON document — key count, max depth, type distribution and array lengths. Understand payload shapes and check schema compliance locally.

Generate C# classes with Newtonsoft.Json attributes from a JSON sample. Handles nested classes, collections, and null fields. Runs entirely in your browser.

Convert a JSON sample into a ready-to-use Go struct with json tags. Handles nested structs, slices, unions, and null fields. Runs entirely in your browser.

Generate Pydantic v2 BaseModel classes from a JSON sample. Get type-safe Python models for API responses, configs, and LLM structured output.

Convert JSON data into clean TypeScript interfaces. Includes nested types, optional fields, arrays, and union types. Runs entirely in your browser.

Infer a Zod validation schema from any JSON sample. Paste your JSON and get a type-safe Zod schema you can copy directly into your project.

Test JSONPath expressions against your JSON document. See every match with its path and value, including wildcards and recursive descent.

Get a rough order-of-magnitude token estimate and projected cost across GPT-4o, Claude, Gemini, Llama and DeepSeek. A fast sanity check, not a tokenizer.

Write Markdown and see the rendered HTML as you type. A safe CommonMark-style parser with headings, lists, tables, task lists and code blocks — all local.

Generate realistic fake JSON from a sample or schema — infers types, patterns and ranges. Output any number of records to seed databases and test APIs.

Compare two texts line by line with a side-by-side view and a git-style unified diff, powered by a fast LCS algorithm. Runs entirely in your browser.

Generate UUID v7 identifiers per RFC 9562 in bulk, and decode the embedded millisecond timestamp back to a readable date. Runs entirely in your browser.

Pretty-print, indent, validate and minify XML online. Detects malformed tags, unclosed elements and mismatched quotes, with DTD support. No upload.

Convert XML to JSON and back entirely in your browser. Attributes, nested elements, repeated tags and text are mapped automatically. No upload.

Convert JSON to clean, indented YAML in your browser. Handles nested objects, arrays, strings, numbers, booleans and null. No upload, no size limit.

Format, pretty-print and convert block-style YAML online. Re-indents nested mappings and can emit JSON — a structural subset, not a full YAML 1.2 parser. 100 percent client-side.

Repair truncated or malformed JSON — unbalanced braces and brackets, trailing commas, single quotes, unquoted keys, missing commas and truncated tails are recovered automatically. Nothing is uploaded.

Generate Java classes with Jackson annotations from a JSON sample. Handles nested classes, lists, and null fields. Runs entirely in your browser.

Generate Kotlin data classes with kotlinx.serialization or Gson annotations from a JSON sample. Handles nested objects, lists and nullable fields.

Convert a JSON sample into a Rust struct with serde derive and rename attributes. Handles nested structs, vectors, enums and Option fields.

Break a regular expression down token by token — literals, character classes, quantifiers, groups and anchors — with plain-English explanations of what each part does.