# JSONViewerTool.com

> Free, 100% client-side online JSON tools for developers. View, format, validate, repair, compare, and convert JSON directly in the browser — no uploads, no sign-up, no data retention. Privacy-first: your JSON never leaves your device.

## Core JSON tools
- [JSON Viewer](https://jsonviewertool.com/): View and explore JSON in tree, code, and text modes.
- [JSON Formatter](https://jsonviewertool.com/json-formatter): Pretty-print JSON or sort object keys.
- [JSON Validator](https://jsonviewertool.com/json-validator): Validate and lint JSON with clear error messages and line numbers.
- [JSON Repair](https://jsonviewertool.com/json-repair): Fix broken or invalid JSON — trailing commas, single quotes, unquoted keys, missing brackets, comments, Python True/False/None.
- [JSON Parse](https://jsonviewertool.com/json-parse): Parse stringified or escaped JSON into real objects (JSON.parse-style).
- [JSON Stringify](https://jsonviewertool.com/json-to-string): Convert JSON to a string (JSON.stringify-style) for logs and payloads.
- [JSON Minifier](https://jsonviewertool.com/json-minifier): Minify JSON to remove whitespace and shrink payload size.
- [JSON Escape / Unescape](https://jsonviewertool.com/json-escape): Unescape escaped JSON to readable text, or escape quotes, newlines, tabs and Unicode into valid JSON.
- [JSON Size Analyzer](https://jsonviewertool.com/json-size-analyzer): Measure JSON payload size in bytes, KB, and MB.
- [JSON Compare](https://jsonviewertool.com/json-compare): Side-by-side and semantic diff of two JSON documents (value changes, missing keys, order).
- [JSON Visual Editor](https://jsonviewertool.com/json-visual-editor): Edit JSON in a tree or graph view and sync changes back to raw text.
- [JSON Search & Replace](https://jsonviewertool.com/json-search): Find and replace keys or values across nested JSON.
- [JSON Sort](https://jsonviewertool.com/json-sort): Sort JSON arrays by one or more keys.
- [Load JSON from URL](https://jsonviewertool.com/load-json-from-url): Fetch JSON from a URL, then view and validate it.
- [All JSON Tools](https://jsonviewertool.com/json-tools): Index of every JSON tool on the site.

## Transform & edit JSON
- [JSON Flatten / Unflatten](https://jsonviewertool.com/json-flatten): Flatten nested JSON to dot-path keys and unflatten back to nested objects.
- [JSON Transform / Map](https://jsonviewertool.com/json-transform): Reshape JSON with JSONPath selectors and mapping rules.
- [JSON Key Renamer](https://jsonviewertool.com/json-key-renamer): Rename JSON keys via a mapping (supports dot paths for nested keys).
- [JSON Remove Keys](https://jsonviewertool.com/json-remove-keys): Remove or keep specific JSON keys by dot path.
- [JSON Merge](https://jsonviewertool.com/json-merge): Merge two JSON documents with conflict strategies (prefer right, preserve left, concat arrays).
- [JSON Merge Patch (RFC 7396)](https://jsonviewertool.com/json-merge-patch): Apply an RFC 7396 merge patch to a base document.
- [JSON Patch / Diff (RFC 6902)](https://jsonviewertool.com/json-patch): Generate RFC 6902 patch operations by diffing two JSON documents.
- [JSONPath / JMESPath Query](https://jsonviewertool.com/json-path): Query JSON and filter arrays with JSONPath or JMESPath.
- [JSON Pointer (RFC 6901)](https://jsonviewertool.com/json-pointer): Resolve RFC 6901 pointer paths to extract exact values.
- [JSON Split / Chunker](https://jsonviewertool.com/json-split): Split large JSON arrays into smaller chunks for upload limits and batch jobs.
- [JSON to/from NDJSON](https://jsonviewertool.com/json-ndjson): Convert between JSON arrays and NDJSON (JSON Lines) for streaming and bulk imports.

## Convert JSON to/from data formats
- [JSON to CSV](https://jsonviewertool.com/json-to-csv): Convert a JSON array, including nested records, into CSV.
- [CSV to JSON](https://jsonviewertool.com/csv-to-json): Convert CSV rows into JSON objects with header mapping.
- [JSON to XML](https://jsonviewertool.com/json-to-xml): Convert JSON into structured XML.
- [XML to JSON](https://jsonviewertool.com/xml-to-json): Convert XML into JSON.
- [JSON to YAML](https://jsonviewertool.com/json-to-yaml): Convert JSON into YAML for configs and pipelines.
- [YAML to JSON](https://jsonviewertool.com/yaml-to-json): Convert YAML (YML) into JSON.
- [JSON to XSD](https://jsonviewertool.com/json-to-xsd): Generate an XML Schema (XSD) from JSON.
- [XSD to JSON](https://jsonviewertool.com/xsd-to-json): Inspect an XSD — elements, types, attributes, namespaces — as JSON.
- [JSON to Excel](https://jsonviewertool.com/json-to-excel): Export JSON to an Excel (XLSX) file with headers and sheets.

## Convert JSON to code, types & schema
- [JSON to TypeScript](https://jsonviewertool.com/json-to-typescript): Generate TypeScript interfaces from JSON.
- [JSON to Python](https://jsonviewertool.com/json-to-python): Generate Pydantic models, dataclasses, or TypedDicts from JSON.
- [JSON to Go](https://jsonviewertool.com/json-to-go): Generate typed Go structs with json tags from JSON.
- [JSON to Java POJO](https://jsonviewertool.com/json-to-java-pojo): Generate Java POJO classes from JSON with nested models.
- [JSON to C#](https://jsonviewertool.com/json-to-csharp): Generate C# classes from JSON with nullable handling.
- [JSON Model Generator](https://jsonviewertool.com/json-model-generator): Generate TypeScript, Java, and C# models from JSON in one place, when you need several languages at once.
- [JSON to SQL](https://jsonviewertool.com/json-to-sql): Convert JSON to SQL insert/update/delete/upsert statements for MySQL, PostgreSQL, SQLite, SQL Server, and Oracle.
- [JSON to Avro](https://jsonviewertool.com/json-to-avro): Generate an Avro schema from JSON for Kafka and data pipelines.
- [JSON to Protobuf](https://jsonviewertool.com/json-to-protobuf): Generate a Protobuf schema from JSON.
- [JSON to Schema](https://jsonviewertool.com/json-to-schema): Infer a Draft-07 JSON Schema from sample JSON.
- [JSON Schema Builder](https://jsonviewertool.com/json-schema-builder): Build a JSON Schema by hand from field definitions, types, and constraints.
- [JSON Schema Validator](https://jsonviewertool.com/json-schema-validator): Validate JSON against a JSON Schema and report errors.
- [JSON Sample Generator](https://jsonviewertool.com/json-sample-generator): Generate realistic sample JSON from a JSON Schema or template.

## Encoding & utilities
- [JSON Encrypt](https://jsonviewertool.com/json-encrypt): Encrypt or decrypt JSON with a password using AES-GCM, fully client-side.
- [JWT Decoder](https://jsonviewertool.com/jwt-decoder): Decode and inspect JWT header, payload claims, expiry, and algorithm.
- [Base64 Encoder](https://jsonviewertool.com/base64-encoder): Encode text to Base64 (including URL-safe).
- [Base64 Decoder](https://jsonviewertool.com/base64-decoder): Decode Base64 to readable text.
- [UUID Generator](https://jsonviewertool.com/uuid-generator): Generate RFC 4122 v4 UUIDs.
- [Text Compare](https://jsonviewertool.com/compare-clips): Compare two strings or paragraphs side-by-side with a diff.

## Guides
- [All Guides](https://jsonviewertool.com/blog/): Index of every JSON guide and tutorial on the site.
- [What Is JSON?](https://jsonviewertool.com/blog/what-is-json): Objects, arrays, syntax rules, and why JSON powers APIs.
- [Common JSON Errors and How to Fix Them](https://jsonviewertool.com/blog/common-json-errors): Missing commas, bad quotes, invalid brackets, and how to fix them.
- [How to Escape and Unescape JSON Strings](https://jsonviewertool.com/blog/how-to-escape-json-string): Which characters must be escaped, with examples in JavaScript, Python, Java, and C#.
- [JSON Schema Tutorial](https://jsonviewertool.com/blog/json-schema-tutorial): Core keywords and how to validate JSON against a schema in Ajv and Python jsonschema.
- [JSONPath Cheat Sheet](https://jsonviewertool.com/blog/jsonpath-syntax): JSONPath operators and filters, JSONPath vs JMESPath, with JS and Python examples.
- [NDJSON & JSON Lines (JSONL)](https://jsonviewertool.com/blog/ndjson-json-lines): What NDJSON is, why it beats a JSON array for streaming, and how to read/write it.
- [JSON Patch vs JSON Merge Patch (RFC 6902 vs 7396)](https://jsonviewertool.com/blog/json-patch-vs-merge-patch): How each works, the trade-offs, and when to use which.
- [How to Flatten Nested JSON](https://jsonviewertool.com/blog/flatten-nested-json): Dot/bracket key notation and flatten/unflatten in JavaScript and Python.
- [How to Compare Two JSON Files](https://jsonviewertool.com/blog/how-to-compare-json-files): Why stringify equality lies, the diff gotchas, and semantic comparison.
- [JSON Payload Size: How to Measure and Shrink It](https://jsonviewertool.com/blog/json-payload-size): Why .length lies, real API limits, and three changes that shrink a payload.
- [JSON to YAML for DevOps](https://jsonviewertool.com/blog/json-to-yaml-devops): Converting JSON to YAML for configs, with examples and edge cases.
- [CSV to JSON Guide](https://jsonviewertool.com/blog/csv-to-json-guide): Parsing CSV into JSON — delimiters, quoting, and type inference.
- [JSON to CSV Guide](https://jsonviewertool.com/blog/json-to-csv-guide): Flattening JSON into CSV — nested records, headers, and arrays.
- [Decode JWT Safely](https://jsonviewertool.com/blog/decode-jwt-safely): Inspect header and payload claims in the browser and avoid common security mistakes.
- [Format JSON Online](https://jsonviewertool.com/blog/format-json-online): Formatting and beautifying JSON, common error fixes, and best practices.
- [Minify JSON for Production](https://jsonviewertool.com/blog/minify-json-for-production): Shrinking payload size safely and improving load speed.
- [JSON vs XML](https://jsonviewertool.com/blog/json-vs-xml): Trade-offs in readability, schema support, and payload size, and when each fits.
- [Top JSON Tools 2025](https://jsonviewertool.com/blog/top-json-tools-2025): Picks for formatting, validation, conversion, comparison, and debugging.
- [How to Get JSON into Excel](https://jsonviewertool.com/blog/get-json-into-excel): The CSV path, Power Query for nested data, and a pandas script for automation.
- [Generate Go Structs from JSON](https://jsonviewertool.com/blog/json-to-go-structs): Getting json tags and numeric types right, and avoiding silent zero-values.
- [JSON to Python: dataclass vs TypedDict vs Pydantic](https://jsonviewertool.com/blog/json-to-python-dataclass-pydantic): Comparing the three typed targets and when to use each.
- [Turn JSON into SQL INSERT Statements](https://jsonviewertool.com/blog/json-to-sql-insert): Converting a JSON array into SQL inserts, plus the gotchas that corrupt data.
- [Generate TypeScript Types from JSON](https://jsonviewertool.com/blog/json-to-typescript-types): Generating interfaces and the predictable gaps generators leave.

## Optional
- [About JSONViewerTool](https://jsonviewertool.com/about): What the site is and the privacy-first, client-side approach.
- [FAQ](https://jsonviewertool.com/faq): Privacy, supported formats, limits, and troubleshooting.