Line-numbered JSON editor with format, repair, graph/tree/table views, multi-format input (YAML/CSV/XML), code generation, JSONPath query, mock data, large-file worker parsing, share URL, schema validation, and compare — all private in your browser.
Also searched as: json beautifier · json prettifier · json validator · json lint · json pretty print
Your data is processed entirely in your browser — including graph rendering and code generation. Nothing is uploaded, even in Graph view.
Step-by-step guide to get the most from this tool
Paste JSON, YAML, CSV, or XML. Upload a file, load from URL, or open a shared link.
Use Format, Smart beautify, Repair, or Auto-correct to fix syntax issues.
Switch to Tree or Graph view, run JSONPath queries, generate TypeScript/Go/Rust code, or validate against a schema.
Copy output, download as .json, export graph as PNG/SVG, or share a link with teammates.
What makes this tool stand out
Editor with line numbers and error line highlighting.
Interactive node graph with per-field edges, pan, zoom, fullscreen, and PNG/SVG export.
Share encoded links or fetch JSON from public APIs.
Explore nested data visually with type badges and search.
Paste YAML, CSV, or XML and visualize as JSON.
Generate TypeScript, Go, Rust structs, or JSON Schema from your data.
Auto-correct, remove nulls, flatten, sort keys, mock data.
Validate against custom JSON Schema.
Side-by-side diff with path highlighting.
More free utilities you might find useful
Quick answers to common questions
Documents over 512 KB parse in a background Web Worker. Tree, graph, and table views disable above 512 KB; compare disables above 5 MB. Files up to 50 MB support format, minify, and repair.
Graph view renders your JSON as an interactive node graph. Objects and arrays become connected nodes with labeled edges. Pan, zoom, expand/collapse branches, search, and export as PNG or SVG.
Yes. Use the Format selector to choose YAML, CSV, or XML input. The tool converts to a JS object and renders in Text, Tree, Graph, or Table view.
ToolReign offers text/tree/graph/table views, format, repair, JSONPath query, code generation, mock data, schema validation, compare, share URLs, and load-from-URL — all private in your browser.
Auto-correct fixes trailing commas, single quotes, unquoted keys, comments, and other common mistakes, then normalizes with standard formatting.
Click Share to copy a URL with your JSON encoded in the query string. Share links are limited to documents under 64 KB; use Download for larger files.
Click From URL and paste a public JSON endpoint. CORS must allow browser access; private APIs require pasting manually.
It strips null values from objects and arrays recursively, useful before sending payloads to APIs that reject null fields.
Flatten converts nested objects into dot-notation keys (e.g. meta.free) for flat CSV-style exports.
Click Compare, paste JSON in both panels, then switch to Tree mode. Differences are highlighted with a diff panel below.
Yes. All processing — including graph rendering and code generation — happens in your browser. Nothing is uploaded, even in Graph view.
Your data is processed entirely in your browser. Nothing is sent to any server.