Dev tools · alternatives · 2026

24 alternatives to JData - Random JSON Generator

Tool for generating random dummy GeoJSON data for testing

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. JData - Random JSON Generator launched in 2020; newer entries below may have overtaken it.

1. 1GJ
   Generate JSON mock data for testing/initial app development▲103

   Easily create complex JSON data structures using intuitive templates.

   2023 · jsongenerator.io · its alternatives →

2. 2
   Generate JSON▲77

   AI-generated dummy JSON - deploy in seconds

   2023 · jsonviewer.stack.hu · its alternatives →

3. 3
   JSON Generator▲139

   Create mock and sample JSON using a powerful template syntax

   2014 · json-generator.com · its alternatives →

4. 4
   My first open-source project release – RandomJson▲56

   Provides a Kotlin/Java library to create a random json string - mangatmodi/RandomJson

   2019 · github.com · its alternatives →

5. 5
   Jb / json.bash – Command-line tool (and bash library) that creates JSON▲183

   jb is a UNIX tool that creates JSON, for shell scripts or interactive use. Its "one thing" is to get shell-native data (environment variables, files, program output) to somewhere else, using JSON encapsulate it robustly. I wrote this because I wanted a robust and ergonomic way to create ad-hoc JSON data from the command line and scripts. I wanted errors to not pass silently, not coerce data types, not put secrets into argv. I wanted to leverage shell features/patterns like process substitution, environment variables, reading/streaming from files and null-terminated data. If you…

   2024 · github.com · its alternatives →

6. 6
   JSON For You – Visualize JSON in graph or table views▲211

   After two years of improvement, I think it's time to share it with you all. Here’s a quick overview: - Common features include validation, formatting, minification, and more. - Visualize JSON in a graph or table view. - Structured comparison with fallback to text comparison. - Navigate though JSON using JSON pointer. - Supports jq. Would love to hear the community's questions, thoughts and comments!

   2024 · github.com · its alternatives →

7. 7JA
   JsonTree, a 3.53kb JavaScript tool for generating html trees from JSON▲78

   a lightweight dependency free javascript micro-library for making collapsable trees with JSON

   2017 · maxleiter.github.io · its alternatives →

8. 8
   JSON Generator▲8

   Tool for generating random data

   2019 · next.json-generator.com · its alternatives →

9. 9
   Mock Turtle▲72

   GUI approach to generating realistic mock JSON data

   2022 · mockturtle.net · its alternatives →

10. 10
    JSON Crack▲70

    Simple visualization tool for your JSON data.

    2022 · jsoncrack.com · its alternatives →

11. 11
    Data Populator▲149

    Sketch and XD plugin to populate mockups with real data.

    2019 · datapopulator.com · its alternatives →

12. 12
    Pollux▲82

    Fake json data & json server mock API generator with JWT

    2021 · mohammedal-rowad.github.io · its alternatives →

13. 13
    Generate Data▲4

    Quickly Generate Large Volumes of Custom Data

    2018 · generatedata.com · its alternatives →

14. 14
    Mitata – Benchmarking tooling for JavaScript▲93

    I always had a sweet tooth for how easy it is to use google/benchmark, but when working with js, current libraries didn't feel right and some were not even accurate enough, so I decided to create my own library to make JavaScript benchmarking tooling better. With more free time, I finally implemented all features I wished for in 1.0.0 and made a lightweight C++ single-header version for moments when google/benchmark is too much. Hope this library helps you as much as it does me.

    2024 · github.com · its alternatives →

15. 15
    a small weekendish project - JSON Blob▲106

    2013 · jsonblob.com · its alternatives →

16. 16
    Verify JSON using minimal schema▲91

    verify-json. Contribute to yusufnb/verify-json development by creating an account on GitHub.

    2020 · github.com · its alternatives →

17. 17
    JSON5 — modern JSON▲64

    JSON5 — JSON for Humans. Contribute to json5/json5 development by creating an account on GitHub.

    2012 · github.com · its alternatives →

18. 18
    I created a lightweight JavaScript library to visualize JSON as a graph▲62

    Effortlessly visualize JSON structures as dynamic tree diagrams - The-01-Company/jsontr.ee

    2024 · github.com · its alternatives →

19. 19
    Weird JSON superset with BigInt, Infinity, TypedArray etc▲67

    the JS/Node.JS library for encoding complex and unconventional data structures. Support for BigInts, TypedArrays, null, undefined, and Symbol. Multiple flavors available. - DO-SAY-GO/WeirdJSON

    2020 · github.com · its alternatives →

20. 20
    A tool to Convert JSON schemas into TypeScript Deno classes▲43

    Hello all To preface this is just something I've been making as a learning exercise, so all feedback is appreciated. This is a tool that converts JSON schemas into TypeScript utility classes for use in Deno. Automatic Type Generation: Typescript interfaces for the compressed and uncompressed versions of your data. Compression & Decompression: Compress and decompress your data. Validation: Built-in data validation using Ajv ensures your data adheres to the schema. Reusability: Once generated, the utility classes can be used in other Deno projects. It currently only supports a subset of JSON…

    2023 · github.com · its alternatives →

21. 21
    Weird JSON▲19

    the JS/Node.JS library for encoding complex and unconventional data structures. Support for BigInts, TypedArrays, null, undefined, and Symbol. Multiple flavors available. - DO-SAY-GO/WeirdJSON

    2022 · github.com · its alternatives →

22. 22
    Random Data Generator for arbitrary data types▲5

    Datasino is a command line tool that can come handy when load testing a service or database. Give it a data schema (many compound types supported, including recursive types), an encoding (JSON, CSV or ClickHouse) and a target (a file or a Kafka partition) and a data rate and it will generate a reasonably optimized (native code) random data source. See the top of the README for some examples. If you have any ideas on how to extend this tool so that it's useful to more people, please let me know.

    2022 · github.com · its alternatives →

23. 23
    Mock Data Generator▲4

    Paste real JSON, get 1,000 coherent rows that match it

    Jun 2026 · jsondevtools.org · its alternatives →

24. 24
    Misata – synthetic data engine using LLM and Vectorized NumPy▲24

    Hey HN, I’m the author. I built Misata because existing tools (Faker, Mimesis) are great for random rows but terrible for relational or temporal integrity. I needed to generate data for a dashboard where "Timesheets" must happen after "Project Start Date," and I wanted to define these rules via natural language. How it works: LLM Layer: Uses Groq/Llama-3.3 to parse a "story" into a JSON schema constraint config. Simulation Layer: Uses Vectorized NumPy (no loops) to generate data. It builds a DAG of tables to ensure parent rows exist before child rows (referential integrity).…

    Dec 2025 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →