JSON-first developer tools
Free online JSON tools for developers. Sort, minify, validate, merge, split, and compare JSON instantly. Most tools run locally in your browser, and any server-assisted flow is clearly disclosed before you use it.
Most Popular JSON Tools
The tools developers use most -- validate, format, convert, compare, and explore JSON in your browser.
JSON Pretty Print & Viewer
Pretty-print, minify, and inspect JSON with strict-valid output, lenient repair modes, tree search, and local-only processing.
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.
JSON Compare
Compare two JSON files side-by-side with semantic diff. See additions, deletions, and modifications.
JSON to CSV
Convert JSON to CSV with deep flattening, array explosion, and clean spreadsheet-ready output.
JSON to YAML
Convert JSON to valid YAML with profile presets, large-file safety, and conversion audit reporting.
JSON Schema Validator
Validate JSON against JSON Schema drafts with grouped violations, draft detection, and path-aware diagnostics.
JSON Path Finder
Discover exact and wildcard JSONPath expressions with interactive tree exploration, search, and live extracted values.
JSON Grid Viewer
Explore JSON as a sortable grid with nested cell inspection, dataset-path selection, and visible-state CSV or Excel export.
Beyond JSON — XML, SQL & Encoding
DevToolsBuilder is not JSON-only. Explore dedicated hubs for XML conversion, SQL export, and encode/decode utilities — all with the same privacy-first, browser-local processing.
Base64 Tools
Encode, decode, convert, and inspect Base64 data for JSON, images, XML, binary payloads, and text in your browser.
- JSON to Base64 Converter
- XML to Base64
- Binary to Base64
- Image to Base64
- Base64 to Image
- Base64 Encode
- Base64 Decode Tool
- Base64 to JSON Converter
YAML Tools
View, validate, and convert YAML for Kubernetes, Docker Compose, CI/CD, and config files.
Browse all yaml toolsXML Tools
Validate, format, convert, and inspect XML with XPath, XSLT, schema validation, and more.
Browse all xml toolsSQL Tools
Convert SQL INSERT statements and query results to CSV, JSON, XML, YAML, and HTML.
Browse all sql toolsEncode & Decode
Base32, Base58, Base64, URL, HTML, UTF-8, and hex encoding — all processed in your browser.
Browse all encode & decodeWhy DevToolsBuilder?
Built by developers who care about JSON and shipping quality—privacy and speed are non-negotiable.
Privacy First
Most tools process locally in your browser. Any server-assisted workflow is clearly labeled up front.
Lightning Fast
No server round-trips. Instant results with client-side processing.
Developer Focused
Clean interface, keyboard shortcuts, and features developers actually need.
Learn JSON from beginner to advanced
49 free lessons covering fundamentals, parsing, APIs, security, performance, and language-specific guides for JavaScript, Python, Go, and more.
Start building with better JSON tools
No sign-up required. 126 free tools running in your browser with privacy-first processing.
Explore All Tools