JSON Tools

JSON toolkit for developers: format, minify, merge, compare, convert CSV/YAML/XML/SQL/TS, JSONPath query, validate and repair. Runs locally in browser, no upload, private.

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JSON Tools

31 available

JSON Compress

Free online JSON compression tool. One-click minify formatted JSON into compact single-line format. Supports JSON Escape/Unescape, built-in smart syntax repair (trailing commas, single quotes, etc.), real-time compression ratio display, pure frontend processing with no data upload, keyboard shortcuts supported.

JSON CompressJSON Online CompressJSON Minify

CSV to JSON

Online CSV to JSON converter with automatic comma/semicolon/tab delimiter detection, first-row headers auto-converted to JSON keys, RFC 4180 compliant parsing supporting quoted fields and escaping, smart repair for column mismatches and unclosed quotes, 400ms debounce real-time conversion, pretty/minified dual output modes, pure local processing with upload/download support.

CSV to JSONCSV to JSON ArraySpreadsheet to JSON

JSON to CSV

Convert JSON arrays to CSV online for free. Built for data analysts and Excel users. Quickly transform JSON data into CSV table text with custom delimiters (comma/semicolon), BOM output, nested field expansion, and formula escaping. Export data in one click, perfectly compatible with Excel, Google Sheets, and database imports. Pure local processing, fast and secure. Try now.

json to csvcsv exporttable conversion

JSON Diff

GeekFormat free online JSON Diff tool. Compare two JSON objects side by side with highlighted added, deleted, and modified fields. Auto-formats before performing line-by-line and character-by-character comparison, with real-time stats for additions, deletions, and modifications. Supports both text and semantic views. Ideal for API integration debugging, config file version comparison, and automated test assertions.

JSON CompareJSON DiffJSON Difference Detection

JSON Escape / Unescape

Free JSON Escape / Unescape online tool by GeekFormat, built for developers. Escape and unescape JSON strings with one click, solving code embedding issues with quotes, newlines, and backslashes. Supports real-time syntax validation, smart repair, and multi-language code compatibility. Perfect for frontend development, API debugging, JSON-LD generation, and log data processing. Local processing, fast and secure.

json escape onlinejson unescape freeescape json string

JSON Flatten

Free online JSON flatten and unflatten tool. Supports custom separators, array-index expansion, and max depth limits. Browser-side processing keeps your data private. Ideal for MongoDB dot queries, CSV export, Elasticsearch indexing, API debugging, and config preprocessing.

JSON flattenflatten JSONnested JSON to flat

JSON Formatter

Popular

GeekFormat free online JSON Formatter tool. Supports JSON beautification, validation, minification, and structure viewing. Built-in syntax error detection and auto-repair. Supports code conversion to 13 programming languages (TypeScript/Java/Python/Go, etc.). Ideal for API debugging, configuration inspection, and log reading.

JSON FormatterJSON BeautifierJSON Formatter Online

JSON Generator

Generate random JSON data online for free. 12+ built-in realistic field types (name, email, UUID, date, URL, phone, etc.). Supports range control, custom enums, and batch generation up to 1000 records. Perfect for API Mock testing, frontend prototyping, database seeding, and load testing. Start now.

json generatorrandom jsonmock data

JSONPath Query

Online JSONPath query tool supporting property access, array index, wildcard, array slicing, conditional filtering (?()) and other syntax. Real-time query on nested JSON with JSON/table dual view toggle, built-in common examples, auto-fix JSON errors, purely browser-local processing. Ideal for API assertion debugging, field extraction, and log troubleshooting.

JSONPath query onlineJSONPath tester onlineJSON field extraction

JSON Merge

GeekFormat free online JSON Merge tool supports 4 strategies: deep recursive, shallow overwrite, array concat, and array replace, and can merge multiple JSON objects at once. Ideal for multi-source API response aggregation, config file layering, and i18n translation consolidation. 100% local processing.

JSON mergeJSON MergeJSON deep merge

JSON Repair

GeekFormat free online JSON Repair tool auto-detects and fixes common syntax errors: trailing commas, single quotes, missing quotes, unclosed brackets, comments and Markdown wrappers. Built for AI/LLM output cleanup, interface anomalies and truncated JSON recovery. Repaired output can be formatted, validated or code-generated. 100% local processing protects privacy.

JSON repairJSON RepairJSON auto fix

JSON Schema Validator

Popular

Free online JSON Schema validation tool supporting Draft 4/6/7/2019-09/2020-12 specifications. Validate JSON data in real-time with precise JSON Pointer error location, detailed field-level error messages, $ref resolution, if/then/else conditional validation, anyOf/oneOf/allOf combinatorial logic and other advanced features. No registration required, runs locally in your browser with zero data upload.

JSON Schema validatorJSON Schema validationJSON Schema online tool

JSON Sort

GeekFormat free online JSON Sort tool. Two modes: sort object keys alphabetically or sort array elements, recursive by default, with ascending/descending toggle. Ideal for normalizing configs, reducing Git Diff noise, standardizing API responses, and comparing JSON data.

JSON sortJSON SortJSON key sort

JSON Stringify

GeekFormat free online JSON Stringify tool serializes JSON objects into quoted, escaped strings ready to embed. Supports reverse Parse mode. Designed for embedding into Java/Python/JS code, database storage and URL parameters. 100% local processing.

JSON StringifyJSON serializeJSON to string

JSON to HTML Table

Free JSON to HTML tool. Convert JSON to clean HTML tables with nested flatten, custom CSS hook, responsive wrap, null placeholder, and row limit. Local.

json to html tablejson to htmlnested json flatten

JSON to Java

Free JSON to Java online tool by GeekFormat, built for Java backend engineers. Generate high-quality Java entity classes (POJO/Bean) from JSON structure in one click. Supports Lombok annotations, JPA/Hibernate annotations, custom package names, and recursive nested class generation. Supports ZIP download. Essential productivity tool for Spring Boot API development, MyBatis Plus code generation, and microservice data modeling.

json to javajava entity class generatorPOJO generator

JSON to Markdown

Popular

Free online JSON to Markdown tool by GeekFormat. One-click convert JSON array or nested object into standard GFM Markdown table. Supports 4 nest modes, depth control, key beautification, column sort, single/multi/split strategy, 3 alignments. 14 config options with real-time preview, fully local browser execution.

JSON to MarkdownJSON to tableJSON to Markdown table

JSON to SQL

Free online JSON to SQL converter. Turn JSON arrays into INSERT and CREATE TABLE scripts. Supports 20+ dialects with auto type inference. Perfect for data migration.

JSON to SQLJSON to INSERTJSON to DDL

JSON to TOML

Free online JSON to TOML converter. Turn JSON into TOML v1.0 config files with nested tables and arrays. Generate Cargo.toml and pyproject.toml instantly.

json to tomltoml converterconfig file generator

JSON to TypeScript

Free online JSON to TypeScript converter. Auto-infers JSON into TS interface declarations. Supports nested interfaces, optional and readonly fields for React/Vue.

JSON to TypeScriptJSON to TS interfaceJSON to interface

XML to JSON

Free online XML to JSON converter. DOMParser-based with attribute mapping, repeated-element arrays, and JSON/YAML dual output. 100% browser-side.

XML to JSONXML parser toolSOAP message converter

JSON to XML

Free online JSON to XML converter. Auto-converts JSON into standard XML. Pretty-print output with <root><item> wrapping for arrays. Ideal for API and SOAP.

JSON to XMLJSON to xml formatonline JSON to XML

YAML to JSON

Free online YAML to JSON converter. js-yaml-based with auto-fix for tabs, quotes, indentation. Ideal for Kubernetes/Docker/Ansible.

YAML to JSONYAML parser toolYAML config convert

JSON to YAML

Free online JSON to YAML converter, YAML 1.2 spec. Supports 2/4-space indentation and smart JSON repair. Generate K8s and Docker Compose configs.

json to yamlonline json to yamlyaml format converter

JSON to Python

Free online JSON to Python tool. Paste an API response or JSON file to instantly generate Python @dataclass models with type hints. Supports nested objects, List generics, Optional fields, runs locally in your browser, and lets you download model.py.

JSON to PythonJSON to dataclassJSON to Python class

JSON to Go

Free online JSON to Go tool, one-click generation of Go struct type definitions with json tags. Supports automatic type inference for nested objects, slices and interface types, ideal for frontend-backend integration and config file modeling. 400ms auto-conversion, one-click JSON error fix, runs entirely locally in browser with no uploads.

JSON to GoJSON to Go structJSON to Golang

JSON to Rust

Free online JSON to Rust tool. Paste JSON to instantly generate Serde struct with #[derive(Serialize, Deserialize)]. Nested objects auto-split, Vec and Option auto-inferred, Actix-web/axum/reqwest/Tauri ready, runs locally in browser.

JSON to RustJSON to Rust structJSON generate Rust code

JSON to Swift

Free online JSON to Swift tool. Convert API responses or configuration JSON into pure Swift struct/class type declarations in one click. No annotations, no comments. Processed locally in the browser with automatic expansion of nested objects and arrays.

JSON to SwiftJSON to Swift structJSON to Swift type

JSON to C#

Free online JSON to C# tool. Paste JSON to one-click generate standard C# POCO classes or record types with [JsonProperty] annotations. Supports automatic nested class splitting, List generics and Nullable<T> auto-inference, PascalCase naming, compatible with Newtonsoft.Json and System.Text.Json. All processing happens locally in the browser, code never uploaded to servers.

JSON to C#JSON to C# classJSON to C# Class

JSON to C++

Free online JSON to C++ tool. One-click generation of header-only C++ structs (nlohmann/json style) based on std::string / std::vector / nested classes. Smart type inference, optional camelCase naming, automatic nested object splitting, std::optional field handling, runs entirely in your browser, no registration required.

JSON to C++JSON to C++ classJSON to C++ struct

JSON to PHP

Free online JSON to PHP tool, one-click generation of PHP entity classes with namespace, typed properties, JsonSerializable, readonly class, supports ArrayObject / stdClass styles, compatible with Laravel API Resource and Symfony Serializer, ZIP multi-file download, runs locally in browser.

JSON to PHPJSON to PHP classJSON to PHP class