PayloadTools
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JSON Tools

Format, validate, compare, escape, sort, convert, generate a schema for, query, flatten, and validate against a schema — all for JSON, directly in your browser, no signup, no upload, no install. Beautify messy payloads, catch syntax errors with precise messages, diff two JSON objects side-by-side, turn JSON into a safely embeddable string, sort keys or array items, convert to and from CSV or YAML or XML, infer a JSON Schema from a real sample, run JSONPath expressions to pull out exactly the values you need, flatten nested JSON into dot-notation keys and back, and check a real document against that schema with a full violation report. Every tool runs entirely on your device, so your data stays private and results appear instantly, even for large files.

JSON Formatter

Beautify or minify JSON instantly. Format messy JSON into readable, indented output.

Open JSON Formatter

JSON Validator

Validate JSON syntax instantly. Get clear error messages for invalid JSON.

Open JSON Validator

JSON Compare

Compare two JSON objects side-by-side and highlight the differences. Supports tree view and raw diff.

Open JSON Compare

JSON Escape / Unescape

Escape JSON into a JSON-safe string literal, or unescape one back into readable JSON.

Open JSON Escape / Unescape

JSON Sort

Sort JSON object keys alphabetically (A-Z or Z-A), or sort a JSON array of objects by any field.

Open JSON Sort

JSON to CSV

Convert a JSON array of objects into a downloadable CSV file, with nested objects flattened.

Open JSON to CSV

CSV to JSON

Convert CSV into a JSON array of objects, with header detection and optional type inference.

Open CSV to JSON

JSON to YAML Converter

Convert JSON to YAML instantly, with key order preserved. Also converts YAML back to JSON from the same page.

Open JSON to YAML Converter

JSON to XML Converter

Convert JSON into well-formed XML, with a configurable root element and arrays mapped to repeated elements.

Open JSON to XML Converter

JSON Schema Generator

Generate a JSON Schema from sample JSON, with nested object, array, and required field detection.

Open JSON Schema Generator

JSONPath Evaluator

Run JSONPath expressions against JSON and see matching values and their paths instantly.

Open JSONPath Evaluator

JSON Schema Validator

Validate a JSON document against a JSON Schema and see every violation with its path.

Open JSON Schema Validator

JSON Flatten / Unflatten

Flatten nested JSON into dot/bracket-notation keys, or unflatten those keys back into nested JSON.

Open JSON Flatten / Unflatten

JSON Tools - When to use ?

Eleven focused tools, each built for a specific step in working with JSON.

JSON Formatter

Beautify or minify JSON instantly. Format messy JSON into readable, indented output.

When to use it

You have minified or messy JSON — an API response, a log line, a config file — and need it readable, or need to shrink it back down before shipping.

  • Beautify with 2 or 4-space indentation
  • Minify to the smallest possible payload
  • Switch to Tree View for nested data
  • Upload a .json file or paste directly
Open JSON Formatter

JSON Validator

Validate JSON syntax instantly. Get clear error messages for invalid JSON.

When to use it

You're not sure whether a JSON payload is syntactically correct and need to know exactly where it breaks.

  • Instant syntax validation as you type
  • Precise error location and description
  • Handles large documents smoothly
  • Works with pasted text or uploaded files
Open JSON Validator

JSON Compare

Compare two JSON objects side-by-side and highlight the differences. Supports tree view and raw diff.

When to use it

You're checking an API response against an expected shape, or diffing config files across environments.

  • Side-by-side diff with added/removed highlights
  • Deep comparison of nested objects and arrays
  • Tree view and raw diff modes
  • Upload two files or paste both sides
Open JSON Compare

JSON Escape / Unescape

Escape JSON into a JSON-safe string literal, or unescape one back into readable JSON.

When to use it

You need to embed a full JSON payload as a string value inside another JSON document, a config file, or an env var — or decode one that already is.

  • Escape raw JSON into a JSON-safe string literal
  • Unescape a string back into readable JSON
  • Handles content missing its surrounding quotes
  • Upload a .json or .txt file or paste directly
Open JSON Escape / Unescape

JSON Sort

Sort JSON object keys alphabetically (A-Z or Z-A), or sort a JSON array of objects by any field.

When to use it

You're diffing two JSON documents and inconsistent key order is drowning out real changes, or you have a JSON array of records you need ranked by a field like price, date, or score.

  • Sort object keys A-Z/Z-A at every nesting level
  • Sort a JSON array of objects by any field
  • Ascending or descending in both modes
  • Upload a .json file or paste directly
Open JSON Sort

JSON to CSV

Convert a JSON array of objects into a downloadable CSV file, with nested objects flattened.

When to use it

You have a JSON array of records — an API response, an export, a log — and need it in a spreadsheet for a non-developer, a BI tool, or a bulk import.

  • Flattens nested objects into dot-notation columns
  • Builds headers from the union of all fields
  • Missing fields become blank cells, not errors
  • RFC 4180-compliant quoting and escaping
Open JSON to CSV

CSV to JSON

Convert CSV into a JSON array of objects, with header detection and optional type inference.

When to use it

You have data from a spreadsheet, export, or report as CSV, and need it as a JSON array to feed into an API, script, or config.

  • RFC 4180-compliant parsing of quoted fields
  • Toggle whether the first row is treated as headers
  • Optional number/boolean/null type inference
  • Ragged rows with missing or extra columns handled gracefully
Open CSV to JSON

JSON to YAML Converter

Convert JSON to YAML instantly, with key order preserved. Also converts YAML back to JSON from the same page.

When to use it

You have a JSON API response, export, or config and need it as YAML for a Kubernetes manifest, CI config, or just to hand-edit more easily — or the other way around.

  • JSON → YAML by default, YAML → JSON with one click
  • Key order preserved in both directions
  • Multi-document YAML converts to a JSON array
  • Upload a file or paste directly
Open JSON to YAML Converter

JSON to XML Converter

Convert JSON into well-formed XML, with a configurable root element and arrays mapped to repeated elements.

When to use it

You need to send JSON data to a legacy system, SOAP-based service, or enterprise API that only accepts XML.

  • Nested objects become nested elements
  • Arrays become repeated sibling elements
  • Configurable root element name
  • Special characters escaped and invalid tag names sanitized automatically
Open JSON to XML Converter

JSON Schema Generator

Generate a JSON Schema from sample JSON, with nested object, array, and required field detection.

When to use it

You have a real API response or config sample and need a JSON Schema for validation, documentation, or an API contract, without writing one by hand.

  • Infers type per key: string, number, integer, boolean, object, array, null
  • Nested objects and arrays inferred at any depth
  • Required field detection with an editable toggle
  • Choose Draft-07 or 2020-12 output
Open JSON Schema Generator

JSONPath Evaluator

Run JSONPath expressions against JSON and see matching values and their paths instantly.

When to use it

You need to pull specific values out of a large API response, log, or config — by field name, by condition, or from deep inside nested arrays — without writing a script.

  • Standard JSONPath syntax via jsonpath-plus
  • Wildcards, recursive descent, filters, and slicing
  • Results panel shows each match and its exact path
  • Debounced live evaluation with inline error messages
Open JSONPath Evaluator

JSON Schema Validator

Validate a JSON document against a JSON Schema and see every violation with its path.

When to use it

You have a JSON Schema and need to confirm a real API response, config file, or test fixture actually conforms to it before shipping or in CI.

  • Draft-07 and 2020-12 support via Ajv
  • Every violation reported with its JSON pointer path
  • Malformed schema and malformed document treated as distinct errors
  • Copy or download the full validation report
Open JSON Schema Validator

JSON Flatten / Unflatten

Flatten nested JSON into dot/bracket-notation keys, or unflatten those keys back into nested JSON.

When to use it

You need nested JSON as flat, spreadsheet-friendly rows, env-var-style keys, or search-index fields — or need to restore a flattened document back to its original nested shape.

  • Dot-notation keys with bracket notation for array indices
  • Configurable delimiter instead of the default dot
  • Round-trip flatten → unflatten reproduces the original JSON
  • Upload a .json file or paste directly
Open JSON Flatten / Unflatten

Everything You Need to Work with JSON

One consistent toolkit for the JSON tasks developers reach for most often — all free, all client-side.

Fast Browser Processing

Every operation runs locally in JavaScript — no round trip to a server.

Data Never Leaves Your Browser

Your JSON is processed on-device and never uploaded anywhere.

Format & Beautify JSON

Pretty print minified or messy JSON with 2 or 4-space indentation.

Validate JSON

Catch syntax errors instantly with a precise, readable error message.

Compare JSON

Diff two JSON objects and see every addition, removal, and change.

Tree View

Explore nested objects and arrays as a collapsible, navigable tree.

Escape & Unescape JSON

Turn JSON into a JSON-safe string literal, or decode one back into readable JSON.

Sort JSON Keys

Recursively sort object keys alphabetically while preserving array order.

Convert JSON to CSV

Turn a JSON array of objects into a downloadable CSV, with nested fields flattened.

Convert CSV to JSON

Parse CSV into a JSON array of objects, with header detection and optional type inference.

Convert JSON to YAML

Convert JSON to YAML (or back) with key order preserved, right from the same page.

Convert JSON to XML

Turn JSON into well-formed XML, with a configurable root element and arrays as repeated elements.

Generate JSON Schema

Infer a Draft-07 or 2020-12 JSON Schema from a sample, including nested objects, arrays, and required fields.

Query with JSONPath

Run JSONPath expressions and see every matching value and its exact path instantly.

Validate Against a Schema

Check a JSON document against a Draft-07 or 2020-12 schema and see every violation with its path.

Flatten / Unflatten JSON

Turn nested JSON into single-level dot-notation keys, or restore flattened keys back into nested JSON.

Copy Result

Copy formatted, minified, converted, or compared output to your clipboard in one click.

Download Result

Save output as a standalone .json or .yaml file for your project or docs.

What is JSON?

JSON — JavaScript Object Notation — is a lightweight, text-based format for representing structured data. It grew out of JavaScript object syntax in the early 2000s and was quickly adopted well beyond the browser, becoming the default way most APIs, config files, and services exchange data today.

The format itself is small: objects are key-value pairs wrapped in curly braces, arrays are ordered lists in square brackets, and values are limited to strings, numbers, booleans, null, objects, or other arrays. There is no support for comments, dates, or functions — that constraint is deliberate. A small, unambiguous grammar is what makes JSON easy to parse correctly in virtually every programming language.

That combination — human readable, machine readable — is why JSON won out over more verbose formats for so many use cases. A person can open a JSON file and understand the structure at a glance, especially once it's formatted with proper indentation. At the same time, a parser can read it deterministically without guessing at whitespace or type coercion rules, unlike formats such as YAML.

Developers reach for JSON because nearly every language has a fast, built-in or standard-library JSON parser, because REST and GraphQL APIs use it as their default payload format, and because it maps cleanly onto the data structures — objects, arrays, primitives — that most programming languages already have. It's also why tooling around JSON, like formatters, validators, and diff tools, is used so heavily: raw JSON is efficient to transmit but tedious to read, so a quick pass through a formatter or validator is a routine part of working with APIs and configuration.

Where JSON Is Used

JSON shows up across nearly every layer of modern software.

REST APIs

The default request and response payload format for HTTP APIs.

GraphQL APIs

Query results and variables are exchanged as JSON.

Configuration Files

package.json, tsconfig.json, and countless app configs.

Frontend Applications

State, API responses, and local storage data.

Backend Services

Microservices and message queues pass JSON payloads.

AI APIs

LLM requests, responses, and function-calling schemas.

Databases

Document stores and JSON columns in relational databases.

Cloud Services

IAM policies, infrastructure templates, and service configs.

A Typical JSON Workflow

How these tools fit together when you're working with a real API response.

  1. 1

    Receive API Response

    Copy a raw JSON payload from an API, log, or file.

  2. 2

    Validate JSON

    Confirm the syntax is correct before doing anything else.

  3. 3

    Format JSON

    Beautify it into readable, indented output.

  4. 4

    Inspect Tree

    Explore nested fields in a collapsible tree view.

  5. 5

    Compare Changes

    Diff against a previous or expected version.

  6. 6

    Copy / Download

    Grab the result for your code, docs, or tests.

Example JSON

A few common shapes of JSON you can try directly in any of the tools above.

Simple Object

{
  "id": 101,
  "name": "Ada Lovelace",
  "active": true
}
FormatValidateCompare

Nested Object

{
  "user": {
    "id": 101,
    "name": "Ada Lovelace",
    "address": {
      "city": "London",
      "country": "UK"
    }
  }
}
FormatValidateCompare

Array

[
  { "id": 1, "role": "admin" },
  { "id": 2, "role": "editor" },
  { "id": 3, "role": "viewer" }
]
FormatValidateCompare

REST API Response

{
  "status": 200,
  "data": {
    "id": "ord_9F3K2",
    "total": 42.5,
    "items": [
      { "sku": "A1", "qty": 2 }
    ]
  }
}
FormatValidateCompare

Why PayloadTools?

Browser Processing

Every tool runs client-side, entirely on your device.

No Server Upload

Your JSON is never transmitted to or stored on a server.

Fast

Results appear instantly, even for large documents.

Free Forever

No paywalls, tiers, or usage limits.

Mobile Friendly

Fully usable on phones and tablets, not just desktop.

Unlimited Usage

No account, no rate limits, no watermarks.

Modern UI

A clean, fast interface built for daily developer use.

Frequently Asked Questions

Common questions about JSON and about these tools specifically.