JSON Parser Online is a free, fast and private tool for developers to parse JSON, format JSON, validate JSON, decode JSON and explore JSON data as an interactive tree view. Also known as a JSON beautifier, JSON lint, JSON checker or JSON deserializer — everything runs 100% client-side in your browser. Your data is never sent to any server.
An online JSON parser is a browser-based tool that reads a raw JSON string and converts it into a structured, human-readable format. Use it to debug API responses, inspect configuration files, or validate JSON data from any source. JSON Parser Online also renders JSON as a collapsible tree view, making complex nested structures easy to navigate.
Paste your JSON into the input box. The tool formats it automatically. You can also click Format / Beautify to re-indent with 2 spaces. Use Minify to compress JSON back to a single line.
Paste JSON into the input pane. A green Valid JSON badge confirms your JSON is well-formed. A red error bar appears immediately when there is a syntax problem, showing the exact error message so you can fix it fast. This tool works as a JSON lint checker.
Paste your encoded JSON string into the input pane and click Parse JSON or use Eval JSON to evaluate JavaScript object literals that are not strict JSON. The decoded object appears in the tree view.
Completely. JSON Parser Online runs entirely in your browser using JavaScript. Your JSON data is never transmitted to any server, making it safe to use with sensitive or confidential data such as API keys, tokens or private records.
Yes. JSON Parser Online is completely free with no ads, no sign-up, no registration and no usage limits.
JSON Parser Online works on all modern browsers — Chrome, Firefox, Safari and Edge — and on all operating systems including Windows, macOS and Linux. It also works on mobile browsers on Android and iOS.
JSON parsing converts a raw JSON string into a structured data object. JSON formatting (beautifying) re-indents an existing JSON string so it is easier to read. JSON Parser Online does both simultaneously: it parses your JSON and renders it as a formatted, colour-coded tree.
JSON (JavaScript Object Notation) is a lightweight, human-readable data-interchange format. It is widely used for transferring data between web APIs and clients, and as a configuration file format. JSON supports strings, numbers, booleans, null, arrays and objects.