Developer Rizz tool
JSON Formatter & Validator
Format, validate, and inspect JSON privately in your browser.
Paste JSON. Find errors, inspect your data, and copy clean output. All processing stays in your browser.
How to use JSON Formatter & Validator
- Paste JSON, open a .json file, or drop one into the workspace.
- Valid input is formatted automatically. For invalid input, inspect the error location and suggested cause.
- Inspect Code or Tree output, then copy formatted or minified JSON, or download a .json file.
What this tool does
A real code editor
Syntax highlighting, line numbers, bracket matching, search, and configurable indentation.
Actionable syntax feedback
See the error location and likely cause without silently changing your data.
Conversion and CSV
Convert JSON to YAML, XML, text, or flattened CSV.
Query and cleanup
Extract paths, sort keys, deduplicate arrays, and escape or unescape JSON.
Private by design
JSON is processed on your device. No remote AI requests, content uploads, or saved document history.
Common uses
- Edit and validate API responses or configuration files.
- Convert JSON to CSV, YAML, XML, or text.
- Query nested values and clean up keys or duplicate array items.
Processing and privacy
Browser processing: Your JSON stays in your browser. Nothing is uploaded. Editing, validation, formatting, tree inspection, conversion, and downloads run on your device; this workspace has no remote AI actions.
Limitations to know
- Only JSON syntax is validated; schemas and business rules are not checked.
- CSV conversion flattens nested object keys and serializes nested arrays into cells.
- Large or extremely deep documents are subject to explicit safety limits to protect browser memory. Keep exact large numeric identifiers as strings.
Keep original files where applicable, inspect the result, and do not rely on an automated output without checking that it fits your intended use.
Examples
Format and minify a verified object
Input: {"name":"Kai","active":true,"items":[1,2]}
Output: With 2-space indentation: { "name": "Kai", "active": true, "items": [ 1, 2 ] } Minifying that output returns the exact input.
Minify without changing string spaces
Input: { "message": "hello world", "items": [1, 2] }
Output: {"message":"hello world","items":[1,2]}
Detect data-losing duplicate keys
Input: {"status":"draft","status":"final"}
Output: Validation stops with a duplicate-key error instead of silently keeping only the second value. Rename or remove one key, then validate again.
Verify a round trip
Input: Paste {"users":[{"name":"Kai"},{"name":"Ana"}]}, choose 2-space indentation, then copy the formatted result.
Output: Parse the copied output again: it remains valid JSON with two users and users[1].name equal to "Ana". If processing times out, reduce the document below the displayed 10 MiB and 200-level limits.
Practical tips
- Open a .json file or paste content into the shared editor.
- Use collapse and expand controls to navigate large nested objects.
Frequently asked questions
What is JSON?
JSON (JavaScript Object Notation) is a text format for exchanging structured data. Its values can be objects, arrays, strings, numbers, booleans, or null. Object keys and string values use double quotes. API responses and configuration files commonly use JSON.
What is a JSON formatter, and how is it different from a validator?
A formatter adds indentation and line breaks to make valid JSON easier to read. A validator checks whether the text follows JSON syntax. This workspace does both: it checks your input and automatically displays formatted output when it is valid. It does not check your application’s business rules or a JSON Schema.
How do I format JSON?
Paste JSON into Input or open a .json file. Formatted output appears automatically for valid input. Choose 2 spaces, 4 spaces, or tabs in Options. Use Code to review the text or Tree to inspect individual values, then copy or download the result.
How do I fix common JSON errors?
Start at the reported line and column. Remove a trailing comma before a closing brace or bracket, add commas between properties or array items, use double quotes for keys and strings, and close every object and array. Comments, single-quoted strings, undefined, NaN, and Infinity are not valid JSON. Fix the source deliberately; this tool never silently repairs it.
What does minifying JSON do?
Minification removes unnecessary spaces and line breaks outside strings. It does not remove spaces inside string values. For example, { "message": "hello world" } becomes {"message":"hello world"}. Minified output is useful for compact transfer; formatted output is better for debugging.
What are good JSON practices?
Use unique object keys, consistent value types, and UTF-8. Keep identifiers that exceed JavaScript’s safe integer range as strings. Avoid unnecessary nesting and validate data against a schema when your application needs specific fields or types. Never share API credentials or customer data in public examples.
Is my JSON sent to a server?
No. Formatting, validation, tree inspection, conversions, and downloads run in your browser. This workspace does not send JSON to a backend or AI service and does not save document contents between visits. Ordinary site analytics are separate and must never include JSON, filenames, or search terms.
Related tools and guidance
- Text Base64 — Encode and decode UTF-8 text as Base64.
- File Base64 — Encode a file as Base64 or decode a data URI.
- How to validate and format JSON safely — Find syntax errors, make nested data readable, minify only when needed, and verify that values survive the round trip.