Useful JSON Tools starting points

Jump into a common task, then use the full directory below for more specialized tools.

JSON to C# Classes JSON Unflattener JSON to Java Classes JSON Schema to TypeScript JSON Schema to OpenAPI 3.1 Schema JSON Diff & Compare

37 browser developer tools

JSON Tools

Format, validate, inspect, compare, query and generate code/schema from JSON with browser-local tools.

Choose the developer job first

Start with the task you need—formatting, validation, conversion, inspection, or cryptographic checks—and switch tools only when the format or rule changes.

Format & inspect

Start with the everyday payload: format, validate, view the tree, or query common JSONPath locations.

JSON FormatterPaste or open JSON, choose indentation and optional key sorting, then format or minify while keeping syntax errors and structure details visible.JSON ValidatorCheck strict JSON syntax in the browser and inspect valid payload structure without treating schema validation as the same job.JSON ViewerBrowse nested JSON locally and jump from visual inspection into exact pointer or practical JSONPath checks.JSONPath TesterTest child, index, wildcard, and recursive-descent JSONPath expressions against pasted JSON without uploading the document.

Compare & navigate

Review structural changes or exact document locations before transforming data.

JSON Diff & CompareReview added, removed, and changed values without letting object key order or formatting noise hide the real difference.JSON Pointer ToolPaste JSON and enter a JSON Pointer such as /items/0/name to inspect the exact referenced value.JSON Path FinderSearch a JSON document for keys or values and copy the matching RFC 6901 pointer locations.JSON Patch GeneratorCompare source and target JSON, generate a JSON Patch, and apply it locally to verify the resulting document.

Schema & code

Infer starter structure or language types from representative samples.

JSON Schema GeneratorGenerate a starter Draft 2020-12-style structure from samples, then review assumptions instead of treating inference as a complete contract.JSON to TypeScriptTurn sample JSON into editable TypeScript types while keeping inference limits and optional/mixed-shape uncertainty explicit.JSON to Zod SchemaInfer a local Zod validation skeleton from representative JSON, including nested arrays and objects.JSON to GraphQL SchemaInfer GraphQL fields and nested object types from representative JSON as a starting schema draft.

Transform formats

Flatten/unflatten, sort, escape, or move between JSON and JSON Lines.

JSON FlattenerConvert nested objects and arrays into a flat JSON object using explicit object-key and array-index paths.JSON UnflattenerConvert flattened $["key"][0] paths back into nested objects and arrays locally.JSON Sort KeysPaste JSON and sort object keys while preserving array order and JSON values.JSON to JSONL ConverterTurn each array item into one compact JSON line, or serialize a single JSON value as one line.JSONL to JSON ConverterParse one JSON value per non-empty line and combine the results into a standard JSON array.JSON Escape ToolConvert quotes, backslashes, control characters, and newlines into JSON string escape sequences.JSON Unescape ToolConvert escaped sequences such as \n, \t, \" and Unicode escapes back into text.

All JSON Tools

JSON Formatter

Format, validate, minify, sort, inspect, copy, and download JSON locally with parse diagnostics, structure statistics, and quick JSONPath checks.

JSON Validator

Validate JSON syntax locally with line/column-oriented parse context, root/depth/value statistics, and a connected JSONPath inspection panel.

JSON Minifier

Minify valid JSON in a clean two-pane workspace with byte savings, percentage reduction, copy, download, and file loading.

JSON Viewer

Explore JSON as a collapsible tree and use connected local structure statistics, path lookup, JSONPath matching, copy, and download workflows.

JSON Diff & Compare

Compare JSON structurally while keeping a connected local inspector for formatting, sorting, structure statistics, and JSONPath spot checks.

JSON Flattener

Flatten nested JSON into reversible bracket-path keys.

JSON Unflattener

Rebuild nested JSON from WebToolArc bracket-path keys.

JSON Sort Keys

Sort JSON object keys alphabetically with recursive and descending options.

JSON Pointer Tool

Evaluate RFC 6901 JSON Pointer paths against a JSON document.

JSON Path Finder

Find matching keys or scalar values and return their JSON Pointer paths.

JSON Escape Tool

Escape plain text for use inside a JSON string value.

JSON Unescape Tool

Decode JSON string escape sequences into plain text.

JSON to JSONL Converter

Convert a JSON array into newline-delimited JSON values.

JSONL to JSON Converter

Convert newline-delimited JSON into a formatted JSON array.

JSON Schema Generator

Infer a starter JSON Schema from representative JSON while keeping local payload inspection, statistics, and path checks one step away.

JSON Patch Generator

Generate RFC 6902 add, remove, and replace operations between two JSON documents.

JSON to TypeScript

Generate starter TypeScript interfaces from representative JSON with connected local validation, structure statistics, and JSONPath inspection.

JSON to Java Classes

Generate starter Java model classes from sample JSON with nested objects and lists.

JSON to C# Classes

Generate starter C# classes with System.Text.Json property names from sample JSON.

JSON to Go Struct

Generate Go structs with json tags from sample JSON.

JSON to Python Dataclass

Generate Python dataclasses and type hints from sample JSON.

JSON to Kotlin Data Classes

Generate starter Kotlin data classes from sample JSON.

JSON to Swift Codable Structs

Generate starter Swift Codable structs from sample JSON.

JSON to Rust Structs

Generate starter Rust structs with serde derives and rename attributes from sample JSON.

JSON to Zod Schema

Generate starter Zod object schemas and inferred TypeScript types from sample JSON.

JSON to GraphQL Schema

Generate starter GraphQL object type definitions from sample JSON.

JSON Schema Validator

Validate JSON data against a practical browser-local subset of JSON Schema Draft 2020-12.

JSON Schema Example Generator

Generate a representative example value from a JSON Schema starter locally.

JSON Schema Property List

List object properties, paths, types, required state, descriptions, and defaults from a JSON Schema.

JSON Schema Required Fields Extractor

Extract required property paths from nested JSON Schema object definitions.

JSON Schema to TypeScript

Generate a starter TypeScript type model from a practical JSON Schema subset.

JSON Schema to Zod

Generate a starter Zod schema from a practical JSON Schema subset.

JSON Schema to OpenAPI 3.1 Schema

Wrap a JSON Schema as an OpenAPI 3.1 component schema starter.

JSON Schema Documentation Generator

Generate readable Markdown documentation from JSON Schema properties and constraints.

JSON Schema Diff

Compare two JSON Schema documents structurally and list added, removed, and changed paths.

JSON Schema Statistics

Inspect JSON Schema size, property counts, required fields, references, compositions, and depth.

JSONPath Tester

Evaluate a practical JSONPath subset locally with matched values, readable paths, RFC 6901 pointers, result limits, and explicit unsupported syntax.