JSON tools hub

DevToolsBuilder is a developer-first product: we are investing in JSON tooling first—validators, schema checks, converters, diffing, and exploration—so you get reliable utilities for the format behind most APIs and configs. This hub collects those tools in one place. We continue to refine JSON coverage and add adjacent developer workflows over time, always with transparent, local-first processing where it applies.

Available JSON Tools

Listed newest first so the latest launches and updates stay at the top.

• JSON to TypeScript — Generate TypeScript interfaces and types from JSON data. Supports nested objects, arrays, optional nulls, readonly, and JSDoc.
• JSON Escape / Unescape — Escape and unescape JSON strings with JSON, JavaScript, and HTML entity modes and auto-detection.
• Base64 Decode Tool — Decode Base64 and Base64URL strings into text, JSON, or hex with JWT detection and format auto-detection.
• JSON to Query Parameters — Convert JSON objects into URL query strings with configurable array formats, nested key notation, and URL encoding.
• Query Parameters to JSON — Parse URL query strings into structured JSON with nested object support, bracket arrays, and type inference.
• TSV to JSON Converter — Convert tab-separated values into structured JSON with type inference, nested key expansion, and multiple output formats.
• JSON to TSV Converter — Convert JSON arrays and objects into tab-separated values with nested flattening, array handling, and table preview.
• C# to JSON Converter — Convert C# class definitions to sample JSON with attribute-aware key mapping and nullable type support.
• JSON to C# Converter — Generate C# model classes from JSON with Newtonsoft.Json or System.Text.Json attributes and nullable type support.
• Protobuf to JSON Converter — Generate sample JSON from Protocol Buffer .proto schema definitions with nested message and enum support.
• JSON to Protobuf Converter — Generate Protocol Buffer .proto schema definitions from JSON with auto field numbering and proto2/proto3 syntax.
• PHP to JSON Converter — Convert PHP arrays and objects to valid JSON with automatic type detection and syntax stripping.
• JSON to PHP Converter — Convert JSON to PHP associative arrays or stdClass objects with configurable syntax and variable naming.
• Java to JSON Converter — Convert Java POJO class definitions to sample JSON with annotation-aware key mapping.
• JSON to Java Converter — Generate Java POJO classes from JSON with Jackson, Gson, or Lombok annotations, getters/setters, and constructors.
• SQL to JSON Converter — Convert SQL query results, tabular data, and simple INSERT SQL into typed JSON with manual nesting and local-only processing.
• JSON to SQL Converter — Generate editable CREATE TABLE schemas and INSERT statements for PostgreSQL, MySQL, and SQLite with nested-data handling.
• JSON to Base64 Converter — Encode valid JSON into Base64 or Base64URL with UTF-8-safe processing, serialization controls, and a compact size audit.
• Base64 to JSON Converter — Decode Base64 and Base64URL strings into readable JSON or raw text with JWT, data URI, and large-payload support.
• JSON Mock API Generator — Turn JSON into hosted mock REST APIs with CRUD route inference, runtime persistence, a built-in tester, and shareable URLs.
• Mock JSON Generator — Generate realistic mock JSON with a visual builder, seeded faker data, schema mode, reusable templates, and local-only processing.
• JSON to String Converter — Escape valid JSON into string literals and decode escaped JSON wrappers for JavaScript, Python, Java, APIs, and env vars.
• JSON Unflatten Tool — Rebuild nested JSON from flat dotted, bracketed, slash, and pointer-style keys with conflict diagnostics and verification.
• JSON Key Extractor — Extract nested JSON keys and path structures with notation controls, dedupe modes, and export-ready output.
• JSON Patch Generator — Generate RFC 6902 JSON Patch operations from original and modified JSON with pointer-safe paths.
• JSON Flattener — Flatten nested JSON into export-ready key-value output or record-path rows with field profiling, path filtering, and table-friendly previews.
• Markdown to JSON — Convert Markdown into structured JSON blocks and sections with AST parsing, strictness controls, and audit visibility.
• JSON to Markdown — Convert JSON into documentation-ready Markdown with smart mode detection, template loops, and audit visibility.
• JSON Schema Validator — Validate JSON against JSON Schema drafts with grouped violations, draft detection, and path-aware diagnostics.
• Text to JSON — Convert text, logs, JSON Lines, and delimited tables to structured JSON with audit visibility.
• JSON to Text — Convert JSON into readable text formats with flattening, paragraph, and template modes.
• YAML to JSON — Convert YAML to predictable JSON with duplicate-key safeguards, policy controls, and conversion audit.
• JSON to YAML — Convert JSON to valid YAML with profile presets, large-file safety, and conversion audit reporting.
• XML Sorter — Sort repeated XML collections safely by tag, attribute, or child text with scoped path selection and reorder preview.
• YAML to XML Converter — Convert YAML to valid XML with root controls, multi-document handling, and audit-first local processing.
• XML to YAML Converter — Convert XML to readable YAML with roundtrip-aware metadata controls, structure preview, and safety audit reporting.
• PDF to JSON — Extract structured data from PDFs with OCR, layout analysis, and table reconstruction.
• CSV to XML Converter — Convert CSV into structured XML with root and row controls, field-level path mapping, and preview-first local processing.
• CSV to JSON — Convert CSV to JSON with auto-detection, type inference, and flexible output structures.
• JSON to CSV — Convert JSON to CSV with deep flattening, array explosion, and clean spreadsheet-ready output.
• JSON Path Finder — Discover exact and wildcard JSONPath expressions with interactive tree exploration, search, and live extracted values.
• JSON Pretty Print & Viewer — Pretty-print, minify, and inspect JSON with strict-valid output, lenient repair modes, tree search, and local-only processing.
• JSON Grid Viewer — Explore JSON as a sortable grid with nested cell inspection, dataset-path selection, and visible-state CSV or Excel export.
• JSON Compare — Compare two JSON files side-by-side with semantic diff. See additions, deletions, and modifications.
• JSON Split — Break large JSON files into smaller chunks. Split by item count, file size, or key path.
• JSON Merge — Combine multiple JSON objects with smart conflict resolution. Merge configs, API responses, and data files.
• JSON Sorter — Sort JSON keys alphabetically or by custom priority with real-time preview.
• JSON Validator — Validate JSON syntax in real-time. Get clear error messages with line and column numbers.
• JSON Minifier — Compress and minify JSON data instantly. Reduce file size while maintaining valid JSON structure.
• Compare XML Online — Compare two XML files with an XML-aware diff engine, tree-first results, semantic matching, and side-by-side raw verification.
• HTML to XML Converter — Convert HTML tables into valid XML records with header mapping, root and row controls, and preview-first local processing.
• XML to CSV Converter — Convert XML into spreadsheet-ready CSV with record-path selection, nested flattening controls, and table preview.
• XML to HTML Table Converter — Convert XML into responsive HTML table markup with record-path selection, column controls, and preview-first local processing.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It's the most common format for APIs, configuration files, and data storage in modern web development.

Privacy and Security

For our standard in-browser JSON tools, data is processed entirely within your web browser using JavaScript—it is not transmitted to our servers for storage or logging. That keeps sensitive payloads under your control and keeps feedback instant. Always check a tool's own notice if it uses a different flow (for example optional server-assisted features).

Frequently Asked Questions