JSON Toolkit
A dozen JSON tools in one workspace — beautify, validate, minify, explore as a tree, sort, flatten, and convert to CSV, YAML or TypeScript. Everything runs in your browser.
Every JSON job in one place
Working with JSON usually means bouncing between half a dozen single-purpose sites — one to pretty-print, another to validate, another to convert to CSV. This toolkit puts the whole workflow behind one set of tabs. Paste your JSON once and beautify it, check it is valid, minify it for transport, explore it as a collapsible tree, sort or flatten its keys, escape it for embedding, or convert it to CSV, YAML or TypeScript — without ever losing your place or re-pasting.
Beautify, minify and validate
The three everyday jobs. Beautify adds consistent indentation and line breaks so a single-line API response becomes readable and its structure visible. Minify strips every unnecessary space to make the payload as small as possible for storage or transfer, and shows you the size saved. Validate confirms the JSON parses and reports the exact line and column of any syntax error — a trailing comma, a missing quote, an unmatched bracket — so you can fix it fast.
Because every mode parses first, the toolkit doubles as a validator no matter which tab you are on: if a conversion refuses to run, your input has a syntax error.
Convert JSON to CSV, YAML or TypeScript
Convert without leaving the page. JSON → CSV turns an array of objects into a spreadsheet-ready table, taking the column headers from your keys and quoting anything that needs it. JSON → YAML produces clean, correctly-indented YAML for config files, Docker Compose, Kubernetes or CI pipelines. JSON → TypeScript infers an interface from your data so you can drop typed models straight into your code. Each conversion downloads with the right file extension.
Transform: sort keys, flatten, escape
The finishing touches. Sort keys alphabetises every object recursively, which makes two JSON blobs easy to compare and keeps config files tidy. Flatten collapses nested structure into dot-notation keys like address.city, handy for spreadsheets, environment variables or feature flags. Escape turns raw text into a safely-quoted JSON string for embedding inside other JSON or code, and Unescape reverses it back to the original text.
It all stays on your machine
Everything the toolkit does happens locally in your browser using JavaScript — parsing, converting and transforming. Your JSON is never uploaded to a server, which matters when it is an API response, a config file or anything with keys and tokens in it. You can even keep using it offline once the page has loaded.
Questions & answers
Why won't my JSON parse?
It contains a syntax error — most often a trailing comma, a single quote instead of a double quote, an unquoted key, or an unmatched bracket. The Validate tab reports the exact line and column of the problem.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks so JSON is readable; minify removes all unnecessary whitespace so it is as small as possible for storage or transfer. The data is identical either way.
Can it convert any JSON to CSV?
CSV needs tabular data, so the input should be an array of objects (one object per row). A single object or deeply nested data does not map cleanly to rows and columns.
Does the YAML output handle nested objects and arrays?
Yes. Nested objects and arrays are indented correctly, and strings that could be misread (numbers, booleans, or values with special characters) are quoted automatically.
How does JSON to TypeScript infer types?
It reads your sample data and generates an interface, using the first element to infer array item types. Review the result for optional or union fields your sample may not cover.
Is my JSON uploaded anywhere?
No. Every operation runs in your browser, so sensitive API responses, tokens and config data never leave your device.