Free JSON Tools Online - Formatter, Validator, Viewer, Diff
Json Compactor
Compact JSON by removing all whitespace. Convert pretty-printed JSON to single-line format. Browser-based, instant processing.
Json Diff
Compare two JSON objects and see differences highlighted. Detect added, removed, and modified values. Perfect for API debugging. Free and private.
Json Diff Viewer
Compare two JSON objects and highlight differences. Shows added, removed, and modified fields with color-coded diffs. Fast, private, browser-based comparison.
Json Formatter
Format and beautify JSON with proper indentation. Free online JSON formatter works in your browser. No uploads, preserves your data privacy.
Json Key Sorter
Sort JSON object keys alphabetically. Normalize JSON structure for comparison and consistency. Browser-based, private processing.
Json Minifier
Remove whitespace from JSON to reduce file size. Fast minification with size stats. Browser-based, no uploads.
Json Schema Validator
Validate JSON data against JSON Schema. Supports draft-07, draft-2019-09, and draft-2020-12. Detailed error messages. Free and private.
Json Tree Viewer
View JSON in an interactive tree structure. Expand/collapse nodes, search keys, copy values. Great for API debugging. Free and private.
Json Validator
Validate JSON syntax instantly in your browser. Check for errors, view detailed error messages with line numbers. Free, fast, no uploads required.
Json Viewer
View and explore JSON data in an interactive tree format. Expand, collapse, and search through complex structures. Fast, private, works in your browser.
Json Path Tester
Test JSONPath expressions with live results. Extract data from JSON using path queries. See matches highlighted, test filters and wildcards.
Interactive JSON Exploration
JSON data can be deeply nested and difficult to read in plain text. Our interactive tools present JSON as navigable trees, making it easy to explore complex structures, find specific values, and understand data relationships.
JSON Formatting and Beautification
Minified JSON without whitespace is difficult to read and debug. Our formatter adds consistent indentation and line breaks to make JSON structures clear. Choose 2 spaces, 4 spaces, or tabs. Optionally sort keys alphabetically for consistent ordering.
Syntax Validation
The formatter validates JSON syntax while beautifying. Invalid JSON produces clear error messages indicating the problem location. This catches common issues like trailing commas, unquoted keys, and mismatched brackets.
Tree View Navigation
Collapse and expand objects and arrays to focus on relevant sections. Large responses from APIs or database exports become manageable when you can hide irrelevant branches and drill into specific paths. Click any value to copy its full path (e.g., data.users[0].email).
JSON Diff Comparison
Comparing JSON documents helps identify changes between API versions, configuration updates, or data migrations. Semantic diff compares structure rather than formatting, catching meaningful changes while ignoring whitespace differences.