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.

• Binary to Base64 — Validate, format, analyze, and convert binary bits (0s & 1s) into Base64 or Base64URL with Shannon entropy, Hex/ASCII conversions, 6-bit visualizer, and 100% browser privacy.
• XML to Base64 — Validate, format, minify, and encode XML documents into Base64 or Base64URL (RFC 7515) with live XML tree, SVG preview, 6-bit visualizer, and 100% browser privacy.
• Base64 to Image — Decode Base64 strings or Data URIs back into PNG, JPG, GIF, WebP, SVG, BMP, AVIF, and HEIC images with instant preview and download.
• Image to Base64 — Convert PNG, JPG, SVG, WebP, GIF, BMP, AVIF, ICO, TIFF, and HEIC images to Base64 Data URLs with EXIF viewer, code snippets, batch processing, and optimization.
• YAML Merge & Combine — Merge multiple YAML files, Kubernetes manifests, or Helm values with AST deep merging, key-based array matching, and interactive conflict resolution.
• YAML Diff & Compare — Compare two YAML files side-by-side with structural AST diffing, line matching, Kubernetes manifest comparison, and Git unified diffs.
• YAML Formatter & Beautifier — Pretty print, beautify, format, and minify YAML configurations with 100% comment & anchor preservation and ecosystem style profiles.
• YAML Validator — Validate YAML syntax, detect duplicate keys, lint formatting, check Kubernetes, Docker Compose & GitHub Actions schemas, and auto-fix common issues.
• YAML to HTML Converter — Convert YAML documents into semantic HTML tables, lists, definition lists, cards, forms, and responsive webpage previews.
• HTML to YAML Converter — Convert HTML documents, templates, and web pages into clean YAML structures, DOM trees, semantic outlines, or data extractions.
• YAML to SQL Converter — Convert YAML documents into relational SQL schemas, CREATE TABLE definitions, and INSERT scripts across 7 SQL dialects.
• YAML to CSV Converter — Convert YAML files into clean CSV tables with dot/slash/bracket notation flattening, array strategies, and column mapping.
• CSV to YAML Converter — Convert CSV into clean, valid YAML with delimiter auto-detection, type inference, dot-notation nesting, grouping, and multi-document output.
• YAML Viewer — Inspect YAML in an interactive tree with search, statistics, formatted output, validation, and local-only processing.
• SQL Table Relationship Viewer — Visualize SQL schemas as interactive ER diagrams. Parse CREATE TABLE DDL, detect foreign keys, inspect relationships, validate schema issues, and export Mermaid locally.
• SQL Server to MySQL Converter — Convert SQL Server T-SQL scripts, schemas, procedures, and dumps into MySQL-compatible SQL locally with IDENTITY mapping, inline diff, batch ZIP, and reports.
• MySQL to PostgreSQL Converter — Convert MySQL SQL scripts, schemas, dumps, and queries into PostgreSQL-compatible SQL locally with type mapping, warnings, and conversion reports.
• SQL Data Generator Online — Generate synthetic SQL seed data and INSERT scripts with schema builder, faker rules, CREATE TABLE import, and CSV/JSON export.
• SQL Splitter Online — Split SQL scripts into statements, objects, or import-ready chunks with semicolon, GO batch, and custom delimiter support plus ZIP export.
• Hex to UTF-8 — Convert hexadecimal values into UTF-8 text with flexible hex parsing, character preview, and Unicode code points.
• SQL Compare & Diff Checker — Compare two SQL scripts side by side with text, formatted, and structural diff modes, change summaries, and downloadable reports.
• SQL Query Explainer — Explain SQL queries in plain English with logical execution order, clause breakdown, complexity scores, and local AST-based analysis.
• SQL Formatter & Beautifier — Format and beautify SQL queries locally with dialect support for PostgreSQL, MySQL, SQL Server, SQLite, BigQuery, Snowflake, and more.
• SQL Minifier — Minify and compress SQL queries locally with size reduction metrics, dialect support, and optional comment removal.
• SQL Syntax Checker & Validator — Validate SQL syntax locally with dialect-aware parsing, error markers, lint warnings, and downloadable diagnostics.
• SQL Linter Online — Lint SQL for style, safety, readability, and best practices with configurable rules, estimated scores, and local-only processing.
• Text to SQL Converter — Convert CSV, TSV, and delimited plain text into SQL CREATE TABLE and INSERT, UPSERT, MERGE, or COPY statements with schema inference.
• UTF-8 Converter — Convert text into UTF-8 byte representations with hex, decimal, binary, and escaped output formats.
• XML URL Decoding — Decode URL-encoded XML back to formatted XML with validation, pretty print, and error reporting.
• XML URL Encoding — Encode XML safely for transport inside URLs with XML validation and structure preservation.
• HTML Decode — Decode HTML entities back to readable characters with named, numeric, and hex entity support.
• HTML Encode — Encode HTML special characters into named and numeric entities with mode selection and batch processing.
• JSON URL Decode — Decode URL-encoded JSON back to readable JSON with validation, pretty print, and error highlighting.
• JSON URL Encode — Safely encode JSON for use in URLs and query strings with validation, pretty print, and live conversion.
• URL Decode Online — Decode percent-encoded URLs and query strings with error detection, UTF-8 support, and batch decoding.
• URL Encode Online — Encode URLs and query parameters with RFC 3986 compliance, space encoding options, and batch mode.
• Base64 Encode — Encode text and files into standard Base64 or Base64URL with line wrapping, data URI generation, and large file support.
• Base58 Decode — Decode Base58-encoded strings back to text or bytes with character validation and error reporting.
• Base58 Encode — Encode text and bytes into Bitcoin-compatible Base58 with live preview, file upload, and copy/download.
• Base32 Decode — Decode Base32-encoded strings back to text with validation, error reporting, and UTF-8 output.
• Base32 Encode — Encode text and files into RFC 4648 Base32 with live conversion, file upload, and copy/download output.
• SQL to HTML Table Converter — Convert SQL INSERT statements and query results into responsive HTML tables with style presets and live preview.
• SQL to YAML Converter — Convert SQL INSERT statements and query results into structured YAML with configurable indentation and NULL handling.
• SQL to CSV Converter — Convert SQL INSERT statements and query results into CSV with configurable delimiters, quoting, and NULL handling.
• XML Node Counter — Analyze XML structure with element frequency, attribute usage, tree depth metrics, namespace breakdown, and complexity scoring.
• XML Schema Validator — Validate XML documents against XSD schemas with detailed error diagnostics, fix suggestions, schema info panel, and local-only processing.
• XML Editor — Edit, validate, format, and navigate XML with an IDE-like workspace featuring tree outline, real-time validation, statistics, and search/replace.
• XPath Tester Online — Test XPath expressions against XML with namespace support, matched node paths, result counts, copy, and download.
• XSL Transformer Online — Transform XML with XSLT stylesheets using browser-local XSLT 1.0, parameters, HTML preview, and HTML/XML/Text downloads.
• XML Splitter — Split large XML files into smaller valid XML documents by repeated node, record count, or approximate file size with ZIP export.
• PDF to XML Converter — Extract PDF text, tables, OCR output, pages, forms, and warnings into clean XML with server-assisted extraction and browser-side XML generation.
• XML to APK Project Builder — Analyze Android XML and export an APK-ready Android project ZIP with Gradle files, resource checks, layout preview, and build instructions.
• XML to PDF Converter — Convert XML into readable PDF reports with nested hierarchy rendering, attributes, table detection, live preview, and browser-side download.
• XML to Array Converter — Convert XML into PHP arrays, JavaScript objects, or JSON-like arrays with attributes, repeated-node handling, flattening, and local-only processing.
• 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.
• XML to Excel Converter — Convert XML into Excel-ready XLSX spreadsheets with repeating-node detection, nested flattening controls, editable headers, and table preview.
• Text to XML Converter — Convert plain text into valid XML with line, paragraph, and key-value modes, pretty-print output, and local-only processing.
• XML to Text Converter — Convert XML into readable plain text with hierarchy-aware extraction, tag filters, attribute controls, and local-only processing.
• 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 Table to SQL Converter — Convert HTML tables into SQL CREATE TABLE and INSERT, UPSERT, MERGE, or COPY statements with dialect-specific output and schema inference.
• HTML to XML Converter — Convert HTML tables into valid XML records with header mapping, root and row controls, and preview-first local processing.
• SQL to Text Converter — Convert SQL INSERT statements, query results, and CREATE TABLE schemas into readable plain text with multiple formatting modes.
• SQL to XML Converter — Convert SQL INSERT statements or pasted result rows into structured XML with root and row controls and local-only browser processing.
• UTF-8 Decode — Decode UTF-8 byte sequences back to readable text with validation, character inspection, and error highlighting.
• XML Escape Tool — Escape XML special characters into safe entities for code samples, embedding, and transport with local-only browser processing.
• XML to C# Classes Converter — Generate production-ready C# model classes from XML with nested types, serializer profile options, and local-only browser 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.
• XML to SQL Converter — Convert XML into SQL schema and INSERT statements with record-path selection, flattened row output, and local-only browser processing.
• XML Unescape Tool — Decode escaped XML entities back into readable text or XML with validation-aware output and local-only browser 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).