Free online JSON tools — format, validate & convert.
Paste messy JSON or drop a file — format, validate and inspect instantly, in your browser.
This is just the start — 34 dedicated tools
Validate, convert, compare, repair and explore JSON — each on its own focused page.
Private by design
Your data never leaves your device. Files you open and JSON you paste are parsed locally — never sent to a server.
Instant & offline-ready
Runs entirely in your browser — no round-trips, and it keeps working with no connection.
Always free
No sign-up, no limits, no ads. Open a tool and get straight to work.
Free online JSON tools for every job
One place to format, validate, convert, compare, and explore JSON — each tool on its own fast, private, and ad-free page.
Format, validate & repair JSON
Paste an API response or a config file and the JSON formatter beautifies, minifies, and sorts keys in one click — it even turns Python dicts and JavaScript objects into valid JSON. The JSON validator pinpoints syntax errors by line and column, the JSON repair tool fixes trailing commas, single quotes, and truncated payloads automatically, and the Monaco-powered JSON editor validates as you type. To enforce a contract, the JSON Schema validator checks data against a schema and reports every violation by path.
View & explore large JSON
Reading minified JSON is painful. The JSON viewer adds syntax highlighting and collapsible nodes and stays smooth on multi-megabyte files. Prefer a different shape? Explore data as a hierarchy in the JSON tree viewer, scan an array of objects like a spreadsheet in the JSON table viewer, or drill in cell by cell with the JSON grid viewer.
Convert JSON to anything — and back
Move JSON between formats without losing fidelity: JSON to YAML for Kubernetes and CI configs, JSON to CSV for Excel and Google Sheets, JSON to XML for SOAP and legacy systems, JSON to Markdown tables for docs, and JSON to TypeScript interfaces for your code. Every converter runs in reverse too — YAML to JSON, CSV to JSON, and XML to JSON — and JSON stringify & escape wraps a payload into one safe string.
Compare & search JSON
Spot exactly what changed between two payloads with the structural JSON diff, which ignores reordered keys and reformatted whitespace. Find or rename any key, value, or path across a whole document with JSON search & replace (regex supported), or pull precise values by writing an expression in the JSONPath tester.
Frequently asked questions
Everything you might want to know before you paste your first payload.
Yes. Every tool is completely free with no sign-up, no usage limits, and no premium tier. There is nothing to install and no account to create.
Completely. All processing happens locally in your browser using client-side JavaScript. Your data is never uploaded to a server, logged, or stored anywhere — it cannot leave your device.
Once the page has loaded, the tools run entirely on your machine, so they keep working even without a connection. Nothing depends on a backend.
Because everything runs locally, you're only limited by your device's memory. The viewers are optimized to stay smooth on multi-megabyte documents.
A formatter, viewer, file viewer, editor, validator, JSON repair, JSON Schema validator, diff, search & replace, JSONPath tester, tree/table/grid/graph viewers, a JSONL/NDJSON viewer, a Markdown viewer, plus JSON ↔ YAML, JSON ↔ CSV, JSON ↔ Excel, JSON ↔ XML, XML/XSD schema converters, JSON → Markdown, JSON → TypeScript, JSON stringify/escape, a Base64 encoder/decoder, and a JWT decoder/verifier — 34 tools in total.
Yes. The JSON formatter beautifies, minifies, and repairs JSON, and the JSON viewer renders it with syntax highlighting and collapsible nodes. Both are completely free, need no sign-up, and run entirely in your browser.
Open the JSON viewer or tree viewer and paste your JSON or drop a .json file onto the editor. Rendering is virtualized, so multi-megabyte files stay responsive — collapse the top-level nodes and drill into just the part you need.
Yes. Dedicated converters turn JSON into YAML, CSV, XML, Markdown, and TypeScript interfaces — and convert each of those back to JSON. Every conversion runs locally in your browser and preserves your data's structure and types.
Yes. Upload or drag and drop an Excel spreadsheet (.xlsx or .xlsm), a CSV, or a TSV file and it becomes a JSON array of objects instantly — the header row turns into the keys. You can also drop in a .json file to load it straight into any tool. The conversion runs in your browser, so nothing is uploaded to a server.
Yes. The editor understands JSON-adjacent formats too — Python dictionaries (with True, False, and None), JavaScript object literals with unquoted keys, single or mixed quotes, comments, and trailing commas. One click converts any of them into strict, valid JSON.
A JSON object viewer displays a JSON object's keys and values in a structured layout with syntax highlighting and collapsible nested levels, so you can read and navigate complex data without scrolling through raw text. A JSON visualizer does the same thing with extra emphasis on showing the shape and type structure of your data at a glance. The JSON Viewer tool on this site acts as both — it color-codes every type, lets you collapse any branch, and shows the full dot-bracket path to any value on hover.
No ads at all — ever — and no invasive tracking. This site isn't built for ad revenue; it's built to be fast and respectful of your privacy first.