JSON Tools

Format, validate, minify and inspect JSON locally in your browser with zero uploads and zero tracking.

All tools in this category (27)

JMESPath Tester — Query JSON with JMESPath

Test JMESPath expressions against your JSON data with real-time results. JMESPath is the query language used by AWS CLI and boto3. 100% client-side.

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JSON Diff — Compare JSON Data Online

Compare two JSON objects side by side and instantly see the differences. Deep recursive diff with added, removed, and changed values highlighted.

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JSON Escape — Encode JSON Strings Safely

Escape JSON strings to make them safe for embedding in HTML, JavaScript, SQL queries, or URL parameters. 100% client-side.

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JSON Flatten — Nested to Dot-Notation

Flatten nested JSON objects into single-level key-value pairs using dot notation. Perfect for configuration, logging, and data analysis. 100% client-side.

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Popular

JSON Formatter

Beautify, format, and minify messy JSON data instantly with configurable indentation. Supports large nested objects, arrays, and precise syntax error detection.

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JSON Key Extractor — Extract All Keys & Paths

Extract all keys, paths, and their types from JSON objects recursively. Perfect for understanding data structure, generating documentation, and mapping API responses. 100% client-side.

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JSON Merge — Deep Merge Multiple Objects

Deep merge two or more JSON objects into one with intelligent conflict resolution. Handles nested objects, arrays, and type conflicts. 100% client-side.

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JSON Mock Generator — Generate Realistic Test Data

Generate realistic mock JSON data from a JSON Schema using Faker. Perfect for prototyping, testing, and populating demo environments with lifelike data. 100% client-side.

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JSON Patch Generator — RFC 6902 Diff Tool

Generate RFC 6902 JSON Patch operations by comparing two JSON objects. Produces add, remove, replace, move, copy, and test operations. 100% client-side.

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JSON Random Generator — Faker-Powered Test Data

Generate random JSON data using Faker.js for testing and prototyping. Customize structure, types, and output size. 100% client-side.

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JSON Schema Generator — Draft-07 from JSON

Generate JSON Schema (Draft-07) from your JSON data automatically. Handles nested objects, arrays, and type inference. 100% client-side.

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JSON Size Analyzer — Analyze JSON Structure & Size

Analyze your JSON data — key count, nesting depth, array sizes, data types, and byte size. Get detailed structural insights instantly. 100% client-side.

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JSON → C# DTO

Generate C# DTOs from JSON with JsonPropertyName.

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JSON to Excel Converter

Convert JSON data to Excel spreadsheets instantly. Flatten nested objects, arrays, and complex JSON structures into clean .xlsx files with auto-generated headers. 100% client-side.

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JSON → Go Struct

Generate Go structs from JSON with json tags.

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JSON → Java POJO

Generate Java POJO classes from JSON with Lombok support.

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JSON → Python Class

Generate Python classes from JSON. Supports Pydantic.

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JSON → SQL

Convert JSON data to SQL statements with type inference.

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JSON → TypeScript

Generate TypeScript interfaces from JSON objects instantly.

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JSON → XML

Convert JSON to formatted XML. Handles arrays and nested objects.

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JSON → YAML

Convert JSON to clean YAML. Handles nested objects and arrays.

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JSON Unescape — Decode Escaped JSON Strings

Unescape escaped JSON strings back to readable, formatted JSON. Reverse of JSON escape with proper decoding. 100% client-side.

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JSON Unflatten — Dot-Notation to Nested

Restore flattened JSON objects back to their original nested structure. Inverse of JSON flattening with dot-notation parsing. 100% client-side.

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JSON Validator — RFC 8259 Syntax & Schema Checker

Validate JSON against RFC 8259 with precise error localization, line numbers, and auto-repair suggestions. 100% client-side.

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JSON Viewer — Explore & Navigate JSON Trees

Explore and navigate JSON data with an interactive tree view. Search, expand, collapse, and inspect deeply nested structures with syntax highlighting.

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JSONPath Tester — Query & Extract JSON Data

Test JSONPath expressions against your JSON data with real-time result highlighting. Supports dot-notation and bracket-notation queries. 100% client-side.

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OpenAPI Generator — Create 3.0.3 Specs from JSON

Generate OpenAPI 3.0.3 specifications from your JSON data. Automatically creates schema definitions, request/response bodies, and endpoints. 100% client-side.

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About JSON Tools

JSON Tools are a collection of browser-based utilities for working with JSON data. All tools run 100% client-side in your browser — no data is uploaded, no logs are stored, and nothing leaves your device. From formatting and validating to minifying and inspecting, every operation is processed locally via Web Workers, ensuring complete privacy for your sensitive API responses and configuration files.

How to Use JSON Tools

  1. <strong>Choose your tool:</strong> Select a JSON utility from the grid above — Formatter, Validator, Minifier, or Viewer.
  2. <strong>Paste your data:</strong> Copy and paste your raw JSON content into the input area of the selected tool.
  3. <strong>Process instantly:</strong> Click the action button and get your formatted, validated, or minified result immediately — all inside your browser.

Frequently Asked Questions

What types of JSON tools are available?
Our JSON toolset includes a Formatter for beautifying messy JSON, a Validator for checking syntax errors, a Minifier for compressing payload size, and a Viewer for navigating complex nested structures.
Is it safe to paste production JSON data into these tools?
Absolutely. All processing happens entirely in your browser via Web Workers. Your data never reaches any server — there are zero network requests, zero logs, and zero tracking.
Do I need to install anything to use these tools?
No installation required. Everything runs directly in your modern browser (Chrome, Firefox, Safari, Edge). Just open the tool and start working.