DocGen Guide 128 tools · prices checked 20 Oct 2026 Find my tool
Menu

JSON API to XLSX for contracts: 6 document generation tools

For contracts, we list 6 tools that turn JSON sent to an API into an Excel workbook. The lowest paid starting price is $19.50 a month, from Documentero. The first three in our order are Conga Composer, Carbone and docxtemplater.

Tools
6
With USD price
4, from $19.50
Free tier
3
Direct / via Zapier
4 / 2
Checked
20 Oct 2026
  1. 01
    Conga Composer Editor's pick conga.com

    Enterprise Salesforce document generation.

    Outputs PDF, DOCX, XLSX, PPTX, HTML, email Template Word Also reads Salesforce G2 4.4 (849)
    Not published
  2. 02
    Carbone Editor's pick carbone.io

    Priced in EUR: Essential EUR 29/mo (EUR 26 annual).

    Outputs PDF, DOCX, XLSX, PPTX, HTML Template Word Also reads Airtable, Zapier/Make/n8n
    $28 EUR 26, converted
  3. 03
    docxtemplater docxtemplater.com

    JS library, MIT/GPLv3 core.

    Outputs DOCX, PPTX, XLSX Template Word
    $45 EUR 500/yr, converted
  4. 04
    Experlogix Document Automation experlogix.com

    Also Dynamics 365, SugarCRM, Power Platform.

    Outputs PDF, DOCX, XLSX, email, e-sign documents Template Word Also reads Salesforce
    On request
  5. 05
    Docupilot Editor's pick via Zapier docupilot.com

    Starter $29/mo, 100 docs.

    Outputs PDF, DOCX, PPTX, XLSX, e-sign documents Template Word, Visual builder Also reads Airtable, Zapier/Make/n8n, built-in forms
    $29 / mo
  6. 06
    Documentero via Zapier documentero.com

    Micro $19.50/mo shown; price formatting unclear on page.

    Outputs DOCX, XLSX, PDF Template Word Also reads Google Sheets, CSV, Excel, Zapier/Make/n8n +1
    $19.50 / mo, cheapest here

What differs for JSON API

For contracts delivered as XLSX, templates are built in Word (6) and a visual builder (1). Among them, 2 need Zapier, Make or n8n to read JSON sent to an API, so they sit after the tools with a direct connection. Of these, 3 have a free tier.

Besides XLSX, these tools for contracts also write DOCX (6), PDF (5) and PPTX (4). Your own code decides when to call the API, so a document can be built on any event. Published starting prices run from $19.50 to $45 a month, the top end from docxtemplater. Prices were checked on 20 Oct 2026.

Nearby pages

Broader list: JSON API to XLSX (10 tools).

Related lists: JSON API to XLSX for invoices (9 tools), JSON API to XLSX for reports (6), JSON API to XLSX for statements (4), JSON API to PDF for contracts (32), JSON API to DOCX for contracts (22), JSON API to PPTX for contracts (5).

How to generate PDFs from a JSON API: a step-by-step guide, updated 21 Oct 2026.

All tools, with filters for source, output, use case and price.

Not sure which one fits? Answer three questions and get three tools back, scored by the rules on the methodology page.

Find my tool